Month: June 2024
Inverse model for feedforward control
Hello,
I want to implement a feedforward control for good trajectory tracking (feedback path for disturbance rejection comes afterwards).
The system model is an electrical RL-circuit in series with a voltage source. (schematics).
I determined the continuous transfer function to be:
The inverse of this is
(I know that this transfer function can not be realized in physical systems since, but I would hope that simulink lets me simulate the ideal system).
If I combine G^-1 and G in simulink, I would expect to obtain ideal trajectory tracking, because G^-1 * G = 1
However the following model only achieves ideal tracking, if I add a factor of 6 at the marked position. (R=3, L – 0.004, solver is fixed step ode4, 1e-4s stepsize)
Why do I need to add a factor of 6 there?Hello,
I want to implement a feedforward control for good trajectory tracking (feedback path for disturbance rejection comes afterwards).
The system model is an electrical RL-circuit in series with a voltage source. (schematics).
I determined the continuous transfer function to be:
The inverse of this is
(I know that this transfer function can not be realized in physical systems since, but I would hope that simulink lets me simulate the ideal system).
If I combine G^-1 and G in simulink, I would expect to obtain ideal trajectory tracking, because G^-1 * G = 1
However the following model only achieves ideal tracking, if I add a factor of 6 at the marked position. (R=3, L – 0.004, solver is fixed step ode4, 1e-4s stepsize)
Why do I need to add a factor of 6 there? Hello,
I want to implement a feedforward control for good trajectory tracking (feedback path for disturbance rejection comes afterwards).
The system model is an electrical RL-circuit in series with a voltage source. (schematics).
I determined the continuous transfer function to be:
The inverse of this is
(I know that this transfer function can not be realized in physical systems since, but I would hope that simulink lets me simulate the ideal system).
If I combine G^-1 and G in simulink, I would expect to obtain ideal trajectory tracking, because G^-1 * G = 1
However the following model only achieves ideal tracking, if I add a factor of 6 at the marked position. (R=3, L – 0.004, solver is fixed step ode4, 1e-4s stepsize)
Why do I need to add a factor of 6 there? simulink, feedforward, control, laplace MATLAB Answers — New Questions
Vectorized Levenshtein distances between arrays of text labels?
I have to compare "N" ID labels (several thousand) to each other in order to determine which are mistypings of each other. The labels have up to 20 characters. Preliminarily, I am considering the calculation of the N(N-1)/2 Levenshtein distances between them and using clustering which labels correspond to the same ID. It is being done in Python, but none of the Levenshtein distance implementations are vectorized. The NxN array of distances is iterated through on an element-by-element basis.
I thought that there might be a vectorized Matlab version of Levenshtein distance, which I could package for deployment and invocation from Python. I found the a few shown in the Annex below, as well as an "editDistance" function available in R2023b. None of these vectorize the calculation of N(N-2)/2 distances. I’m surprised that a vectorized implementation doesn’t exist. Am I missing something obvious?
Annex: Matlab implementations of Levenshtein distance
https://people.math.sc.edu/Burkardt/m_src/levenshtein/levenshtein.html
https://www.mathworks.com/matlabcentral/fileexchange/17585-calculation-of-distance-between-strings
https://blogs.mathworks.com/cleve/2017/08/14/levenshtein-edit-distance-between-stringsI have to compare "N" ID labels (several thousand) to each other in order to determine which are mistypings of each other. The labels have up to 20 characters. Preliminarily, I am considering the calculation of the N(N-1)/2 Levenshtein distances between them and using clustering which labels correspond to the same ID. It is being done in Python, but none of the Levenshtein distance implementations are vectorized. The NxN array of distances is iterated through on an element-by-element basis.
I thought that there might be a vectorized Matlab version of Levenshtein distance, which I could package for deployment and invocation from Python. I found the a few shown in the Annex below, as well as an "editDistance" function available in R2023b. None of these vectorize the calculation of N(N-2)/2 distances. I’m surprised that a vectorized implementation doesn’t exist. Am I missing something obvious?
Annex: Matlab implementations of Levenshtein distance
https://people.math.sc.edu/Burkardt/m_src/levenshtein/levenshtein.html
https://www.mathworks.com/matlabcentral/fileexchange/17585-calculation-of-distance-between-strings
https://blogs.mathworks.com/cleve/2017/08/14/levenshtein-edit-distance-between-strings I have to compare "N" ID labels (several thousand) to each other in order to determine which are mistypings of each other. The labels have up to 20 characters. Preliminarily, I am considering the calculation of the N(N-1)/2 Levenshtein distances between them and using clustering which labels correspond to the same ID. It is being done in Python, but none of the Levenshtein distance implementations are vectorized. The NxN array of distances is iterated through on an element-by-element basis.
I thought that there might be a vectorized Matlab version of Levenshtein distance, which I could package for deployment and invocation from Python. I found the a few shown in the Annex below, as well as an "editDistance" function available in R2023b. None of these vectorize the calculation of N(N-2)/2 distances. I’m surprised that a vectorized implementation doesn’t exist. Am I missing something obvious?
Annex: Matlab implementations of Levenshtein distance
https://people.math.sc.edu/Burkardt/m_src/levenshtein/levenshtein.html
https://www.mathworks.com/matlabcentral/fileexchange/17585-calculation-of-distance-between-strings
https://blogs.mathworks.com/cleve/2017/08/14/levenshtein-edit-distance-between-strings levenshtein-distance, vectorized MATLAB Answers — New Questions
difference between 2 values in a vector
Hello Community.
Asking for your help again to find a solution…..
I have a vector with several data points, I’d like to get the difference between each value that is not equal to CERO.
I’m using "diff" command however this includes the difference betwee values that are equal to CERO, here is an example.
x = [0.2 0.0 0.0 0.0 0.25 0.0 0.0 0.0 0.3 0.0 0.0 0.4 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.35 ]
I tried this : b = diff(x)
b = -0.20 0.0 0.0 0.25 -0.25 0.0 0.0 0.30 -0.30 0.0 0.40 -0.40 0.0 0.0 0.10 -0.10 0.0 0.0 0.35
it gives me the difference between each data point
What I’m trying to get is the difference between each point that is not equal to cero like this:
b = 0.0 0.0 0.0 0.0 0.05 0.0 0.0 0.0 0.05 0.0 0.0 0.1 0.0 0.0 0.0 -0.3 0.0 0.0 0.0 0.25
I don’t want to eliminate the ceros in between if I do so it will change the length of the vector and I need to keep same lenght to compare Vs other signals.
the number of ceros between each data value is not always the same, could be 3 ceros in between but it could be 2, 4, 6…..
as always I thank you in advance, your feedback will be higly appreciated.Hello Community.
Asking for your help again to find a solution…..
I have a vector with several data points, I’d like to get the difference between each value that is not equal to CERO.
I’m using "diff" command however this includes the difference betwee values that are equal to CERO, here is an example.
x = [0.2 0.0 0.0 0.0 0.25 0.0 0.0 0.0 0.3 0.0 0.0 0.4 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.35 ]
I tried this : b = diff(x)
b = -0.20 0.0 0.0 0.25 -0.25 0.0 0.0 0.30 -0.30 0.0 0.40 -0.40 0.0 0.0 0.10 -0.10 0.0 0.0 0.35
it gives me the difference between each data point
What I’m trying to get is the difference between each point that is not equal to cero like this:
b = 0.0 0.0 0.0 0.0 0.05 0.0 0.0 0.0 0.05 0.0 0.0 0.1 0.0 0.0 0.0 -0.3 0.0 0.0 0.0 0.25
I don’t want to eliminate the ceros in between if I do so it will change the length of the vector and I need to keep same lenght to compare Vs other signals.
the number of ceros between each data value is not always the same, could be 3 ceros in between but it could be 2, 4, 6…..
as always I thank you in advance, your feedback will be higly appreciated. Hello Community.
Asking for your help again to find a solution…..
I have a vector with several data points, I’d like to get the difference between each value that is not equal to CERO.
I’m using "diff" command however this includes the difference betwee values that are equal to CERO, here is an example.
x = [0.2 0.0 0.0 0.0 0.25 0.0 0.0 0.0 0.3 0.0 0.0 0.4 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.35 ]
I tried this : b = diff(x)
b = -0.20 0.0 0.0 0.25 -0.25 0.0 0.0 0.30 -0.30 0.0 0.40 -0.40 0.0 0.0 0.10 -0.10 0.0 0.0 0.35
it gives me the difference between each data point
What I’m trying to get is the difference between each point that is not equal to cero like this:
b = 0.0 0.0 0.0 0.0 0.05 0.0 0.0 0.0 0.05 0.0 0.0 0.1 0.0 0.0 0.0 -0.3 0.0 0.0 0.0 0.25
I don’t want to eliminate the ceros in between if I do so it will change the length of the vector and I need to keep same lenght to compare Vs other signals.
the number of ceros between each data value is not always the same, could be 3 ceros in between but it could be 2, 4, 6…..
as always I thank you in advance, your feedback will be higly appreciated. matlab MATLAB Answers — New Questions
Unable to use power query to combine files in folder synced from SharePoint due to system file
I have a library synced locally so that I can analyze portions of the file contents based on a query. Currently there are around 5,000 files in the library, and there will be closer to 10,000 by the end of this week.
I’m unable to use Power Query to combine the files, then edit them, because of a system file. This seems to be a new issue as this is something I’ve done successfully in the past. I’m wondering if there’s a work around. I cannot use SharePoint folder for the data source as there are far too many files on the site, and there’s not an option to filter to only the files in this specific library.
How do I work around this system file issue? If I try to combine & transform or combine & load to, nothing happens. If I try to do either of them, it just returns to this screen.
I have a library synced locally so that I can analyze portions of the file contents based on a query. Currently there are around 5,000 files in the library, and there will be closer to 10,000 by the end of this week.I’m unable to use Power Query to combine the files, then edit them, because of a system file. This seems to be a new issue as this is something I’ve done successfully in the past. I’m wondering if there’s a work around. I cannot use SharePoint folder for the data source as there are far too many files on the site, and there’s not an option to filter to only the files in this specific library. How do I work around this system file issue? If I try to combine & transform or combine & load to, nothing happens. If I try to do either of them, it just returns to this screen. Read More
New Blog | NIST CSF 2.0 – Protect (PR) – Applications for Microsoft 365 (Part 1)
By Shawn Hays
The National Institute of Standards and Technology (NIST) published the first version of its Cybersecurity Framework (CSF) in 2014. Ten years later NIST released the second iteration of CSF, entitled NIST CSF 2.0. Microsoft and its partners have supported organizations in implementing the original CSF guidance, going as far as building and enhancing an assessment in Microsoft Purview Compliance Manager since 2018. This blog and series will look to apply NIST CSF 2.0 to Microsoft 365 and discuss changes from the previous publication.
It is somewhat improper to look at any particular CSF Functions in a vacuum or singular vantage point. NIST CSWP 29 (the primary document) illustrates and describes CSF Functions as “a wheel because all of the Functions relate to one another. For example, an organization will categorize assets under IDENTIFY and take steps to secure those assets under PROTECT. Investments in planning and testing in the GOVERN and IDENTIFY Functions will support timely detection of unexpected events in the DETECT Function, as well as enabling incident response and recovery actions for cybersecurity incidents in the RESPOND and RECOVER Functions. GOVERN is in the center of the wheel because it informs how an organization will implement the other five Functions.”
Read the full post here: NIST CSF 2.0 – Protect (PR) – Applications for Microsoft 365 (Part 1)
By Shawn Hays
The National Institute of Standards and Technology (NIST) published the first version of its Cybersecurity Framework (CSF) in 2014. Ten years later NIST released the second iteration of CSF, entitled NIST CSF 2.0. Microsoft and its partners have supported organizations in implementing the original CSF guidance, going as far as building and enhancing an assessment in Microsoft Purview Compliance Manager since 2018. This blog and series will look to apply NIST CSF 2.0 to Microsoft 365 and discuss changes from the previous publication.
It is somewhat improper to look at any particular CSF Functions in a vacuum or singular vantage point. NIST CSWP 29 (the primary document) illustrates and describes CSF Functions as “a wheel because all of the Functions relate to one another. For example, an organization will categorize assets under IDENTIFY and take steps to secure those assets under PROTECT. Investments in planning and testing in the GOVERN and IDENTIFY Functions will support timely detection of unexpected events in the DETECT Function, as well as enabling incident response and recovery actions for cybersecurity incidents in the RESPOND and RECOVER Functions. GOVERN is in the center of the wheel because it informs how an organization will implement the other five Functions.”
Read the full post here: NIST CSF 2.0 – Protect (PR) – Applications for Microsoft 365 (Part 1) Read More
New Blog | SAP Identity Management to Microsoft Entra ID Migration Guidance Now Available
We’re excited to announce that guidance for SAP Identity Management (IDM) customers planning to migrate their identity management scenarios to Microsoft Entra is now available. In a previous post, we discussed SAP ending maintenance for their identity management solution (SAP IDM) by 2030. We’ve since begun jointly developing documentation to help customers plan a seamless migration to the recommended alternative—Microsoft Entra ID. For many customers, it may be possible to get started immediately, leveraging the subscriptions that they already own with Microsoft 365 suites. Microsoft 365 enterprise suite licenses include Entra ID P1 features that will be the focus of this first round of guidance. In this post, we’ll also outline additional benefits of Microsoft Entra ID and list some key partners who can help you get started.
Continuing collaboration for enterprise security
Microsoft and SAP have a long history of collaborating to keep our customers’ organizations productive and secure—an effort especially important now as more companies have adopted hybrid work arrangements, making it possible to work from office and from home. For example, last year we announced how Microsoft Sentinel is helping organizations bring SOAR threat monitoring capabilities to their SAP environments. We continue to deepen our relationship, and now we’re extending support for SAP customers’ digital transformation and cloud adoption goals with a seamless and secure identity management solution in Microsoft Entra ID.
Read the full post here: SAP Identity Management to Microsoft Entra ID Migration Guidance Now Available
By Irina Nechaeva
We’re excited to announce that guidance for SAP Identity Management (IDM) customers planning to migrate their identity management scenarios to Microsoft Entra is now available. In a previous post, we discussed SAP ending maintenance for their identity management solution (SAP IDM) by 2030. We’ve since begun jointly developing documentation to help customers plan a seamless migration to the recommended alternative—Microsoft Entra ID. For many customers, it may be possible to get started immediately, leveraging the subscriptions that they already own with Microsoft 365 suites. Microsoft 365 enterprise suite licenses include Entra ID P1 features that will be the focus of this first round of guidance. In this post, we’ll also outline additional benefits of Microsoft Entra ID and list some key partners who can help you get started.
Continuing collaboration for enterprise security
Microsoft and SAP have a long history of collaborating to keep our customers’ organizations productive and secure—an effort especially important now as more companies have adopted hybrid work arrangements, making it possible to work from office and from home. For example, last year we announced how Microsoft Sentinel is helping organizations bring SOAR threat monitoring capabilities to their SAP environments. We continue to deepen our relationship, and now we’re extending support for SAP customers’ digital transformation and cloud adoption goals with a seamless and secure identity management solution in Microsoft Entra ID.
Read the full post here: SAP Identity Management to Microsoft Entra ID Migration Guidance Now Available Read More
PARTICIPATE IN THESE CHALLENGES
Ambassador Challenge: Azure essentials- MLSA
Get ready to dive deeper into Azure AI technology. Using AI, you can build solutions, improve your apps, and accelerate business growth. Master the basics of AI and jump-start your career now!https://learn.microsoft.com/en-us/training/challenges?id=d068b11d-4952-4a61-8115-cd674f31ae73&WT.mc_id=cloudskillschallenge_d068b11d-4952-4a61-8115-cd674f31ae73&wt.mc_id=studentamb_291294
Ambassador Challenge: Azure essentials- MLSAGet ready to dive deeper into Azure AI technology. Using AI, you can build solutions, improve your apps, and accelerate business growth. Master the basics of AI and jump-start your career now!https://learn.microsoft.com/en-us/training/challenges?id=d068b11d-4952-4a61-8115-cd674f31ae73&WT.mc_id=cloudskillschallenge_d068b11d-4952-4a61-8115-cd674f31ae73&wt.mc_id=studentamb_291294 https://learn.microsoft.com/en-us/training/challenges?id=d068b11d-4952-4a61-8115-cd674f31ae73&WT.mc_id=cloudskillschallenge_d068b11d-4952-4a61-8115-cd674f31ae73&wt.mc_id=studentamb_291294 Read More
Exchange Online (M365) – create an account that can ONLY see calendar free/busy
Our org is fully using M365 and my boss is looking for me to create an AAD member account that ONLY has access to see organizational users (AAD member) calendar Free/Busy and can do nothing else in M365 (No outlook, SharePoint, OneDrive, access to any apps, etc.). Is there a way to set up such an account? I “think” she might want to have a contractor use this account to see Free/Busy in order to manually notify others of when they can schedule a meeting for certain staff members.
Thank you!
Brian
Our org is fully using M365 and my boss is looking for me to create an AAD member account that ONLY has access to see organizational users (AAD member) calendar Free/Busy and can do nothing else in M365 (No outlook, SharePoint, OneDrive, access to any apps, etc.). Is there a way to set up such an account? I “think” she might want to have a contractor use this account to see Free/Busy in order to manually notify others of when they can schedule a meeting for certain staff members. Thank you!Brian Read More
Ambassador Challenge: Azure Protect against cyber threats
Protect against cyber threats with Microsoft Defender XDR across endpoints, identities, email, and applications. Learning objectives After completing this module, you’ll be able to: Describe the Microsoft Defender XDR service.
Protect against cyber threats with Microsoft Defender XDR across endpoints, identities, email, and applications. Learning objectives After completing this module, you’ll be able to: Describe the Microsoft Defender XDR service. https://learn.microsoft.com/en-us/training/challenges?id=4ed6cfd6-2e7b-4b57-a340-a614060d2636&WT.mc_id=cloudskillschallenge_4ed6cfd6-2e7b-4b57-a340-a614060d2636&wt.mc_id=studentamb_291294 Read More
Page Analytics tab not showing for Wiki type page in SharePoint Online
Hi,
I am not seeing Page Analytics tab for Wiki pages in SharePoint Online, while Page Analytics tab is available for moder page type in SharePoint Online.
How to get Page Analytics for Wiki pages type in SharePoint online.
Please suggest.
Hi,I am not seeing Page Analytics tab for Wiki pages in SharePoint Online, while Page Analytics tab is available for moder page type in SharePoint Online. How to get Page Analytics for Wiki pages type in SharePoint online.Please suggest. Read More
SCVMM vTPM issue
Hello,
Is there any way in SCVMM 2022 to create an unshielded VM with vTPM? I have a small POC environment with SCVMM 2022, don’t want to use HGS services. I could do vTPM in hyper-v manager but can’t find anything in SCVMM console.
Thanks in advance for any work around!
Hari
Hello, Is there any way in SCVMM 2022 to create an unshielded VM with vTPM? I have a small POC environment with SCVMM 2022, don’t want to use HGS services. I could do vTPM in hyper-v manager but can’t find anything in SCVMM console. Thanks in advance for any work around! Hari Read More
MS-ISAC advisories as a threat feed?
This is regarding the MS-ISAC advisories that are pushed out by the Center for Internet Security (CIS) Cyber Threat Intelligence (CTI) team. Basically a listing of IP’s and Domains that have observed maliciousness or attributes thereof.
Are these lists automatically included as a threat feed into Defender proper via Microsoft ingesting it and adding to its databases? Or are these to be manually put in the Defender Endpoint IoC lists on the organizations Defender portal? I ask as I seem to have a limit of 15k for IoC across file hash, IP, URL/Domain, and certificates combined which would go quick considering MS-ISAC Advisories are usually a couple hundred at a time.
This is regarding the MS-ISAC advisories that are pushed out by the Center for Internet Security (CIS) Cyber Threat Intelligence (CTI) team. Basically a listing of IP’s and Domains that have observed maliciousness or attributes thereof. Are these lists automatically included as a threat feed into Defender proper via Microsoft ingesting it and adding to its databases? Or are these to be manually put in the Defender Endpoint IoC lists on the organizations Defender portal? I ask as I seem to have a limit of 15k for IoC across file hash, IP, URL/Domain, and certificates combined which would go quick considering MS-ISAC Advisories are usually a couple hundred at a time. Read More
Microsoft Defender for Cloud Apps’ Shadow IT Discovery Capabilities Now Support MacOS
The rapid growth of SaaS apps makes it challenging to gain visibility across the apps used in an organization’s environment. SaaS apps are often used without the awareness of IT departments, a phenomenon known as Shadow IT. Moreover, the swift adoption of generative AI apps introduces an additional layer of security complexity and risks. Organizations need effective app security solutions more than ever to ensure that employees only access approved and safe apps.
A key aspect of combating Shadow IT is ensuring comprehensive visibility into all the apps used in an organization’s environment, which includes the identification of all SaaS apps used by employees, regardless of the operating system. This broad scope of app discovery is essential in providing a holistic view of your SaaS landscape to help security teams discover and control Shadow IT effectively.
Gain full visibility into your SaaS apps with Microsoft Defender for Cloud Apps
Microsoft Defender for Cloud Apps offers powerful discovery capabilities to help you gain visibility into all SaaS apps, including AI apps, in your organization, assess their risk, and leverage sophisticated analytics to enhance the overall SaaS security. Previously, cloud discovery discovered SaaS apps in Windows devices through the network logs via defender for endpoint integration. To continuously improve our product experience and deliver a broader scope of app discovery, today we are thrilled to announce the public preview of our new comprehensive discovery capabilities within Microsoft Defender for Cloud Apps to help customers:
Discover Shadow IT SaaS apps on macOS devices in addition to windows
Detect and remediate risky/unusual behaviors on SaaS apps on macOS devices
This discovery capabilities on macOS work seamlessly with the native Microsoft Defender for Endpoint. This enhancement not only bolsters the discovery process but also improves the overall discovery comprehensiveness for security administrators, facilitating effective management of SaaS security risks.
For customers who do not use the native Microsoft Defender for Endpoint integration with Defender for Cloud Apps, we have ensured comprehensive discovery coverage by introducing the highly requested enhancements to our log collector. Specifically, we have added two new capabilities to the Defender for Cloud Apps log collector, enabling it to operate on popular container runtimes such as Podman and AKS. With these capabilities, customers can leverage the log collector to thoroughly discover shadow IT apps on other popular distros like RedHat and AKS.
Discovery on macOS via Microsoft Defender for Endpoint
Customers need to enable the network protection component in Defender for Endpoint in order to discover shadow IT on macOS. Here is a quick guide on how to enable network protection.
Once you have the network protection enabled, to access the discovery of shadow IT SaaS apps, navigate to the Cloud discovery tab in the Microsoft Defender portal. Once there, you’ll find Defender – managed endpoints listed under the stream as shown in Figure 1. Selecting this stream presents you with a comprehensive view of discovered applications, resources, IP addresses, users, and devices information for both Windows and macOS devices within your tenant. This unified view facilitates a more complete understanding of Shadow IT across different operating systems.
Figure 1: The navigation path in the Microsoft Defender portal, under the Defender – managed endpoints stream.
Podman support for the Defender for Cloud Apps log collector
The log collector, a container image that traditionally operates on Docker runtime, now extends its support to Podman, the container runtime and orchestrator endorsed by Red Hat Enterprise Linux (RHEL) 8 and subsequent versions. This expansion ensures that the Defender for Cloud Apps log collector is compatible with Podman’s runtime, accommodating customers who use RHEL versions 8 or higher.
The Defender for Cloud Apps log collector is extremely useful for organizations not using the integration with Defender for Endpoint, or a direct integration with a built-in network device isn’t available. It helps to integrate logs from various network appliances, such as firewalls, to generate a discovery report that is pivotal for administrators to pinpoint Shadow IT apps and gather usage telemetry.
Log collector in Azure Kubernetes (AKS)
The log collector feature in AKS enhances Defender for Cloud Apps by enabling the collection of logs from network devices that lack built-in integration. This feature is particularly beneficial for customers who prioritize disaster recovery and resilience for their services hosted on AKS.
With the introduction of log collector support for AKS, Defender for Cloud Apps has expanded its capabilities to include support for Syslog-tls receiver types. Once the log collector deploys log collector on AKS, Customers can configure log sources on AKS and get insights into Shadow IT on AKS workloads.
Our latest enhancements to the shadow IT discovery capabilities in Defender for Cloud Apps empower security administrators with comprehensive app discovery across both Windows and macOS and offer better compatibility and flexibility in deployment. Furthermore, Defender for Cloud Apps is a core component of Microsoft Defender XDR, and these new advancements contribute to delivering a more streamlined and easier to deployable XDR platform that enables security teams to more efficiently protect organizations from today’s advanced cyberthreats.
Getting started
Enable discovery on MacOS by integrating with Microsoft Defender for Endpoint
Configure automatic log upload using Podman
Deploy Log Collector on AKS
Microsoft Tech Community – Latest Blogs –Read More
Upcoming Changes to Supported Versions of Visual Studio for Remote Debugging with Azure App Service
You can attach the Visual Studio debugger to any .Net process running on Azure App Service. This allows you to debug the deployed web app as though it’s running locally.
For more information about how to attach Visual Studio debugger for a web app deployed to Azure App Services please refer to:
Remote Debug ASP.NET Core on Azure App Service (Windows)
Troubleshoot with Visual Studio – Azure App Service | Microsoft Learn
Over the past few years, we have received feedback from our customers regarding the opening of ports on local machines to use remote debugging with App Service. This often requires multilevel approvals and leads to configurational & operational complexity.
Based on this feedback we are announcing changes related to supportability of Visual Studio versions for remote debugging of Windows web applications deployed to App Service. These changes will remove the requirements for local ports when using remote debugging with App Service.
Versions of Visual Studio prior to Visual Studio 2022 will no longer work with the updated remote debugging feature on App Service. Visual Studio 2022 will work with the updated remote debugging feature, but customers will need to upgrade to a newer version of Visual Studio 2022 no later than January 31, 2025. The changes to remote debugging on App Service outlined in the table below will be applicable starting June 2024.
The table below provides an overview of these changes.
Visual Studio
Version
Basic Authentication enabled for the specific App Service web app ###
Remote Debugging Supported
Applicable Timeline
Local Ports Required
2017
All
N/A
No
Starting June 2024
N/A
2019
All
N/A
No
Starting June 2024
N/A
2022
17.9 or earlier
Yes
Yes
Until January 31, 2025
Yes. On local machine
2022
17.9 or earlier
N/A
No
After January 31, 2025
N/A
2022***
17.10 or later
N/A
Yes
N/A
No local machine ports required.
Remote debugging no longer uses basic authentication on App Service.
It’s important to note that the contents of this blog post are not applicable for remote debugging experience related to App Service Linux.
*** Please note that starting Jan 2025 remote debugging for Windows web applications deployed to App Service will be available only when using Visual studio 2022 version 17.10 or later. Remote debugger authentication for a web application no longer uses basic authentication on App Service.
### There are no changes to basic authentication publishing on Azure App Service. The table above refers only to basic authentication on App Service used in conjunction with the remote debugging feature. Please refer to Authentication types by deployment methods – Azure App Service | Microsoft Learn and Disable basic authentication for deployment – Azure App Service | Microsoft Learn for details.
In the coming weeks changes will also be made to the Azure portal experience matching the remote debugging support as explained above.
Microsoft Tech Community – Latest Blogs –Read More
Tuning logical replication on Azure Database for PostgreSQL – Flexible Server
Native logical replication is a built-in feature which was introduced in PostgreSQL 10. It is aimed to replicate data between tables in two separate Postgres databases using a replication identity, usually a primary key. It follows a publisher and subscriber model where there can be one or more publishers or subscribers. The publisher and subscriber databases can be on the same Azure Database for Postgres – flexible server or on two different servers.
The typical use-cases for logical replication are:
Sending incremental changes in a single database or a subset of a database to subscribers as they occur.
Sending the change to subscribers could also help in event driven architectures where the subscriber can process and publish the change to, for example, message brokers like Kafka etc.
Consolidating multiple databases into one data source (for analytical purposes).
Replicating data between different major versions of PostgreSQL.
Replicating between PostgreSQL instances on different platforms (for example Linux to Windows)
Replicating data between servers hosted in different clouds or between on-prem and cloud.
A typical flow involves copying the initial data snapshot from the publisher database to subscriber database and, once the data snapshot copy is completed, any incremental changes on the publisher database are sent to the subscriber database in near real-time.
Using a use-case scenario this blog will share tuning techniques that can be used to improve the performance of the initial data snapshot copy from the publisher to the subscriber database.
The blog is further divided into the following sections:
Server parameters
Use-case scenario
Best practices
Server parameters
The parameters that are used to configure and tune logical replication are as follows:
wal_level: Sets the level of information written to the Write Ahead Log (WAL) to logical.
max_worker_processes: Sets the maximum number of background processes that the system can support. The default value is 8. You can set this value to a number which is greater than the number of subscribers and reserve some for-table data synchronization and parallel apply worker.
max_logical_replication_workers: Specifies maximum number of workers to replicate table data between publisher and subscriber. It includes leader apply workers, parallel apply workers, and table synchronization workers. The default value is 4. Logical replication workers are taken from the pool defined by max_worker_processes.
max_replication_slots: The default is 10. You can set this parameter depending on the number of publishers and subscribers. It can be influenced by the value set to parameter max_sync_workers_per_subscription.
max_sync_workers_per_subscription: Controls the amount of parallelism of the initial data copy during the subscription initialization or when new tables are added. Currently, there can be only one synchronization worker per table. The workers are dependent on max_logical_replication_workers. The default value is 2.
The recommended value is generally about 50% – 75% of the number of vCores on the subscriber server. For example, if the subscriber server is an instance of Azure Database for PostgreSQL Flexible Server running on a Memory Optimized tier, and with an SKU of 16 vCores, then the value of the parameter can be set to 8. This indicates 8 tables can be copied parallelly during initial data copy. To make this change you need to set max_replication_slots, max_worker_processes and max_logical_replication_workers parameters also. A good value for max_worker_processes could be 16 (one worker per one core of CPU), max_replication_slots could be 16 (8 for table data synchronization + additional slots for other purposes) and max_logical_replication_workers could be 12 (for table data synchronization + parallel apply worker workers for in-flight transactions).
Note we recommend 50% -75% of total vCores because, if the number of workers doing initial copy is equal to number of vCores, then you could see 100% CPU utilization on the subscriber server. 50%-75% is just a general recommendation, you can set a higher value but making it too aggressive might result in 100% CPU utilization during initial data copy process on subscriber servers.
max_wal_senders: The maximum number of simultaneously running WAL sender processes. Default is 10. It is recommended to set a value equal to or greater than the number of logical replication slots.
Use-case scenario
In the use case scenario, the publisher database has 6+ tables on Postgres version 16, and the goal is to complete the initial snapshot as fast as possible.
The publisher server is 16 vCore General Purpose Azure Database for Postgres – flexible server with 1 TB storage, and the subscriber server is also a 16 vCore General Purpose Azure Database for Postgres – flexible server with 1 TB storage.
Setup On publisher server:
Server parameters:
wal_level: Logical
max_replication_slots: 12
Execute the following statements on the publisher database:
Grant required permissionsALTER ROLE <role name> WITH REPLICATION;
Note: Please make sure the replication user has read permissions on tables you are trying to replicate.
Create a publicationCREATE PUBLICATION publisher1 FOR TABLE member_claims, member_claims_May,member_claims_April,member_claims_March,member_claims_Feb,member_claims_January;
Setup on subscriber server:
Server parameters:
wal_level: Logical
max_logical_replication_workers: 12
max_worker_processes: 16
max_sync_workers_per_subscription: 6
Autovacuum: OFF
max_wal_size: 64 (GB)
checkpoint_timeout: 1(Hour)
Execute the following statements on the subscriber database:
Create a subscriptionCREATE SUBSCRIPTION <subscription name> CONNECTION’host=xx dbname=xx user=xx password=xx’ PUBLICATION <publisher name>;
Monitoring
Publisher database
Execute the following statement SELECT application_name, wait_event_type, wait_event, query, backend_type FROM pg_stat_activity WHERE state=’active’;
The output should look like this where 6 tables are being copied parallelly
Subscriber database
Execute the following statement to monitor the progress of the initial data copy. SELECT * FROM pg_stat_progress_copy;
For more details on pg_stat_progress_copy you can follow the document COPY-PROGRESS-REPORTING.
Best Practices
In general, it is recommended to have a publisher database and subscriber database on two different servers.
Follow the server parameter guidelines described above.
During the initial data copy phase, you can turn OFF autovacuum, increase max_wal_size to 64 GB if you have a storage size of 1 TB or greater than that [Generally recommended for large storage sizes] and have checkpoint_timeout parameter set to 1 Hour. [We would like the checkpoint to happen less frequently as checkpoint process consumes additional server resources for that purpose 1 hour is recommended. This is again a general recommendation value can be less than 1 hour, it depends on data volume being moved and you can also take into consideration time to recover in case there is a crash during initial data copy phase before coming up with a value]
Note: Once the initial copy is completed it is recommended to vacuum analyze the tables and then turn back autovacuum to ON. The checkpoint_timeout and max_wal_size parameters should also be changed back to previous values.
vacuumdb utility can be used to manually vacuum analyze the tables. For more information follow the document – vacuumdb.
Conclusion
Initial data copy after logical replication is set up between publisher and subscriber databases can be time consuming, particularly when the database size is large with hundreds of tables or database size is large with few large tables. With proper tuning of server parameters mentioned in the blog and having the publisher and subscriber databases on separate servers, you can help reduce the time required significantly.
If you have questions, please contact us at ASK Azure DB for PostgreSQL.
Microsoft Tech Community – Latest Blogs –Read More
looping thru multiple line data in UIAxes plot and writing all X,Y data to an array
Hello, i have a set of line plots on a UIAxes on a UIFigure using Appdesigner.
Note each plot has differing X coordinates
I want a way to be able to save all these plots so that I can revisit later and add further plots to it.
The approach I was going to take was to access the line objects and loop through assigning each X,Y datat set to a data array that I could save out and then recal at a later date.
ax=app.UIAxes;
L=ax.XLim;
L2=L(2); % Get max number on x-axis
h1 = findall(ax, ‘type’, ‘line’) % Get just line objects for now
n=numel(h1); % Number of line plots (will do text objectes later)
H=nan(L2,2*n) % Create an array of Nans to hold all data (row,cols)
% Each line requires its X data to be saved also
Now loop thru’ all line items and splat the X,Y data to the array
for(i=1:n)
t = h1(i)
H(:,(2*i)-1)=(t.XData)’;
H(:,2*i)=(t.YData)’;
end
H
But Im getting the following error
Unable to perform assignment because the size of the left side is 120-by-1 and the size of the right side is 100-by-1.
Error in GenericDataAnalysis/ReadHeadersButtonPushed (line 533)
H(:,(2*i)-1)=(t.XData)’;
I suspect its to do with non-equal length of data sets. Perhaps I need some sort of padding for the missing data?
This is my current output:
L2 =
120
h1 =
7×1 Line array:
Line (20s Delay)
Line (15s Delay)
Line (9s Delay)
Line (5s Delay)
Line (2s Delay)
Line (FC Top)
Line (FC Btm)
The second part of my question, is whats the best approach to retain the colours and text objects?
Remember, i don’t just want the graphic saved, I want to be able to add data to it later from within my GUI.
Thanks
JasonHello, i have a set of line plots on a UIAxes on a UIFigure using Appdesigner.
Note each plot has differing X coordinates
I want a way to be able to save all these plots so that I can revisit later and add further plots to it.
The approach I was going to take was to access the line objects and loop through assigning each X,Y datat set to a data array that I could save out and then recal at a later date.
ax=app.UIAxes;
L=ax.XLim;
L2=L(2); % Get max number on x-axis
h1 = findall(ax, ‘type’, ‘line’) % Get just line objects for now
n=numel(h1); % Number of line plots (will do text objectes later)
H=nan(L2,2*n) % Create an array of Nans to hold all data (row,cols)
% Each line requires its X data to be saved also
Now loop thru’ all line items and splat the X,Y data to the array
for(i=1:n)
t = h1(i)
H(:,(2*i)-1)=(t.XData)’;
H(:,2*i)=(t.YData)’;
end
H
But Im getting the following error
Unable to perform assignment because the size of the left side is 120-by-1 and the size of the right side is 100-by-1.
Error in GenericDataAnalysis/ReadHeadersButtonPushed (line 533)
H(:,(2*i)-1)=(t.XData)’;
I suspect its to do with non-equal length of data sets. Perhaps I need some sort of padding for the missing data?
This is my current output:
L2 =
120
h1 =
7×1 Line array:
Line (20s Delay)
Line (15s Delay)
Line (9s Delay)
Line (5s Delay)
Line (2s Delay)
Line (FC Top)
Line (FC Btm)
The second part of my question, is whats the best approach to retain the colours and text objects?
Remember, i don’t just want the graphic saved, I want to be able to add data to it later from within my GUI.
Thanks
Jason Hello, i have a set of line plots on a UIAxes on a UIFigure using Appdesigner.
Note each plot has differing X coordinates
I want a way to be able to save all these plots so that I can revisit later and add further plots to it.
The approach I was going to take was to access the line objects and loop through assigning each X,Y datat set to a data array that I could save out and then recal at a later date.
ax=app.UIAxes;
L=ax.XLim;
L2=L(2); % Get max number on x-axis
h1 = findall(ax, ‘type’, ‘line’) % Get just line objects for now
n=numel(h1); % Number of line plots (will do text objectes later)
H=nan(L2,2*n) % Create an array of Nans to hold all data (row,cols)
% Each line requires its X data to be saved also
Now loop thru’ all line items and splat the X,Y data to the array
for(i=1:n)
t = h1(i)
H(:,(2*i)-1)=(t.XData)’;
H(:,2*i)=(t.YData)’;
end
H
But Im getting the following error
Unable to perform assignment because the size of the left side is 120-by-1 and the size of the right side is 100-by-1.
Error in GenericDataAnalysis/ReadHeadersButtonPushed (line 533)
H(:,(2*i)-1)=(t.XData)’;
I suspect its to do with non-equal length of data sets. Perhaps I need some sort of padding for the missing data?
This is my current output:
L2 =
120
h1 =
7×1 Line array:
Line (20s Delay)
Line (15s Delay)
Line (9s Delay)
Line (5s Delay)
Line (2s Delay)
Line (FC Top)
Line (FC Btm)
The second part of my question, is whats the best approach to retain the colours and text objects?
Remember, i don’t just want the graphic saved, I want to be able to add data to it later from within my GUI.
Thanks
Jason uiaxes, plot MATLAB Answers — New Questions
finding value in 2d array function of x and y
Hi all, I realise this may be the first time I ask a question even though I’ve been using the forum for 12 years. Kudos to you for asking every question and answering everything that ever crossed my mind. Here’s my question:
Input data:
I have two vectors, Torque effmap.chainTQ and Speed effmap.chainRPM. They are two columns 1×100 elements
There is also a 2D array, much like below. For every (Torque,Speed) pair, there is a corresponding Efficiency value effmap.chainRPM
Processing:
I have a new pair of vectors, say vehicle.wheeltorque and vehicle.wheelspeed which are 1×1000. They represent a duty cycle, which the vehicle is going thru.
For every set of (vehicle.wheeltorque ,vehicle.wheelspeed) I need the code to find the closest value of Efficiency. I can’t figure this one out. I suppose it should be a double for loop of sorts and I found array indexing might be needed, but so far I couldn’t get it to work.
Example efficiency map:
What I tried, and works, is to take the base efficiency map, use interp2 and meshrid to refine it, and for a given single set of (testspeed,testtq) I can extract the Efficiency value – see the "point" value:
effmap.chainRPM = xlsread (’03b_DummychainLossmap’,’Chain’, ‘B3:B23’)
effmap.chainTQ = xlsread (’03b_DummychainLossmap’,’Chain’, ‘C2:W2’)
effmap.chainLoss = xlsread (’03b_DummychainLossmap’,’Chain’, ‘C3:W23’)
surf(effmap.chainRPM,effmap.chainTQ,effmap.chainLoss)
[MeshX,MeshY] = meshgrid(0:10:2000,0:10:2000) %mesh to create more points in a map/array
MeshQ = interp2(effmap.chainRPM,effmap.chainTQ,effmap.chainLoss,MeshX,MeshY,’spline’);
surf(MeshX,MeshY,MeshQ)
testspeed = 200
testtq = 1000
point = interp2(MeshX,MeshY,MeshQ,testtq,testspeed) %so now I know it works
However, it doesn’t work for a full vector of torque and speed :
linear_indices = sub2ind(MeshQ, MeshY(1,:), MeshX(1,:))
logical_indices = (MeshQ(:, 1) == MeshX & MeshQ(:, 2) == MeshY)
extracted_values = MeshQ(logical_indices, 🙂
for vehicle.wheeltorque(1:) to vehicle.wheeltorque(1:size(vehicle.wheeltorque))
………………..
I tried it in many ways, but fundamentally I don’t understand what the logic of the code should be. Help? Last thing, it needs to store the efficiency values in a vector for further analysis.
Cheers, ask if not clearHi all, I realise this may be the first time I ask a question even though I’ve been using the forum for 12 years. Kudos to you for asking every question and answering everything that ever crossed my mind. Here’s my question:
Input data:
I have two vectors, Torque effmap.chainTQ and Speed effmap.chainRPM. They are two columns 1×100 elements
There is also a 2D array, much like below. For every (Torque,Speed) pair, there is a corresponding Efficiency value effmap.chainRPM
Processing:
I have a new pair of vectors, say vehicle.wheeltorque and vehicle.wheelspeed which are 1×1000. They represent a duty cycle, which the vehicle is going thru.
For every set of (vehicle.wheeltorque ,vehicle.wheelspeed) I need the code to find the closest value of Efficiency. I can’t figure this one out. I suppose it should be a double for loop of sorts and I found array indexing might be needed, but so far I couldn’t get it to work.
Example efficiency map:
What I tried, and works, is to take the base efficiency map, use interp2 and meshrid to refine it, and for a given single set of (testspeed,testtq) I can extract the Efficiency value – see the "point" value:
effmap.chainRPM = xlsread (’03b_DummychainLossmap’,’Chain’, ‘B3:B23’)
effmap.chainTQ = xlsread (’03b_DummychainLossmap’,’Chain’, ‘C2:W2’)
effmap.chainLoss = xlsread (’03b_DummychainLossmap’,’Chain’, ‘C3:W23’)
surf(effmap.chainRPM,effmap.chainTQ,effmap.chainLoss)
[MeshX,MeshY] = meshgrid(0:10:2000,0:10:2000) %mesh to create more points in a map/array
MeshQ = interp2(effmap.chainRPM,effmap.chainTQ,effmap.chainLoss,MeshX,MeshY,’spline’);
surf(MeshX,MeshY,MeshQ)
testspeed = 200
testtq = 1000
point = interp2(MeshX,MeshY,MeshQ,testtq,testspeed) %so now I know it works
However, it doesn’t work for a full vector of torque and speed :
linear_indices = sub2ind(MeshQ, MeshY(1,:), MeshX(1,:))
logical_indices = (MeshQ(:, 1) == MeshX & MeshQ(:, 2) == MeshY)
extracted_values = MeshQ(logical_indices, 🙂
for vehicle.wheeltorque(1:) to vehicle.wheeltorque(1:size(vehicle.wheeltorque))
………………..
I tried it in many ways, but fundamentally I don’t understand what the logic of the code should be. Help? Last thing, it needs to store the efficiency values in a vector for further analysis.
Cheers, ask if not clear Hi all, I realise this may be the first time I ask a question even though I’ve been using the forum for 12 years. Kudos to you for asking every question and answering everything that ever crossed my mind. Here’s my question:
Input data:
I have two vectors, Torque effmap.chainTQ and Speed effmap.chainRPM. They are two columns 1×100 elements
There is also a 2D array, much like below. For every (Torque,Speed) pair, there is a corresponding Efficiency value effmap.chainRPM
Processing:
I have a new pair of vectors, say vehicle.wheeltorque and vehicle.wheelspeed which are 1×1000. They represent a duty cycle, which the vehicle is going thru.
For every set of (vehicle.wheeltorque ,vehicle.wheelspeed) I need the code to find the closest value of Efficiency. I can’t figure this one out. I suppose it should be a double for loop of sorts and I found array indexing might be needed, but so far I couldn’t get it to work.
Example efficiency map:
What I tried, and works, is to take the base efficiency map, use interp2 and meshrid to refine it, and for a given single set of (testspeed,testtq) I can extract the Efficiency value – see the "point" value:
effmap.chainRPM = xlsread (’03b_DummychainLossmap’,’Chain’, ‘B3:B23’)
effmap.chainTQ = xlsread (’03b_DummychainLossmap’,’Chain’, ‘C2:W2’)
effmap.chainLoss = xlsread (’03b_DummychainLossmap’,’Chain’, ‘C3:W23’)
surf(effmap.chainRPM,effmap.chainTQ,effmap.chainLoss)
[MeshX,MeshY] = meshgrid(0:10:2000,0:10:2000) %mesh to create more points in a map/array
MeshQ = interp2(effmap.chainRPM,effmap.chainTQ,effmap.chainLoss,MeshX,MeshY,’spline’);
surf(MeshX,MeshY,MeshQ)
testspeed = 200
testtq = 1000
point = interp2(MeshX,MeshY,MeshQ,testtq,testspeed) %so now I know it works
However, it doesn’t work for a full vector of torque and speed :
linear_indices = sub2ind(MeshQ, MeshY(1,:), MeshX(1,:))
logical_indices = (MeshQ(:, 1) == MeshX & MeshQ(:, 2) == MeshY)
extracted_values = MeshQ(logical_indices, 🙂
for vehicle.wheeltorque(1:) to vehicle.wheeltorque(1:size(vehicle.wheeltorque))
………………..
I tried it in many ways, but fundamentally I don’t understand what the logic of the code should be. Help? Last thing, it needs to store the efficiency values in a vector for further analysis.
Cheers, ask if not clear map, array, efficiency, dutycycle, script MATLAB Answers — New Questions
Why do I receive License Manager Error -13?
When I start MATLAB I receive the following error:
ERROR: License Manager Error -13.
No SERVER lines in license fileWhen I start MATLAB I receive the following error:
ERROR: License Manager Error -13.
No SERVER lines in license file When I start MATLAB I receive the following error:
ERROR: License Manager Error -13.
No SERVER lines in license file MATLAB Answers — New Questions
How do I sort these 2D-Points to get a proper surf plot of this function
Hello! I am currently trying to plot the function
on the unit disk . I wrote a function to get some evaluationpoints inside and on the boundary of the disk but when I plot the function on it I get very weird results. I already discussed a similar problem in a previous question and a nice person explained to me that the problem was the way my points where sorted in the matrix and therefore the reshaping didn’t work as desired. Since I get the same problem in the surf plot again, I am quite sure that this is the same case here.
In the function that I wrote to generate points I first started to lay a grid on a square. After that I sort out every point that is outside of the circle or that is on the boundary of the circle. Lastly I put points on the boundary of the circle. The function takes parameters and . First two parameters are the bounds for the square . The parameter is going to be the squareroot of the number of Points we will end up with. The function gives back Matrices xint, xbdy and x. xint holds the interior points and xbdy the points on the boundary of the circle. x should have both points together but there is still the problem on how I sort these… The rows of these matrices are points in that means e.g. x is gonna be a Matrix.
[~,~,~] = GetCircleGrid(-1,1,30); %Example
function [xint,xbdy,x] = GetCircleGrid(a,b,N)
% Radius of Circle
r = (b-a)/2;
% Centerpoint of Circle
x0 = a+r;
y0 = a+r;
% First get a Grid on the whole square
[xsqr1,xsqr2] = meshgrid(linspace(a,b,N),linspace(a,b,N));
xsqr = [xsqr1(:),xsqr2(:)];
% Now get rid of Points outside of Circle
k=1; % counter
for j=1:N^2
if sqrt((xsqr(j,1)-x0)^2+(xsqr(j,2)-y0)^2) < r % If distance from centerpoint is < r
xint(k,:) = xsqr(j,:);
k=k+1;
end
end
NB = N^2-(k-1); % Number of points for boundary so we end up with N^2 points in total
% Get the Boundarypoints
theta = linspace(0,2*pi,NB);
xbdy = zeros(NB,2);
xbdy(:,1) = x0 + r*cos(theta)’;
xbdy(:,2) = y0 + r*sin(theta)’;
x = sortrows([xint; xbdy]); % How to sort these…? 🙁
scatter(xint(:,1),xint(:,2),’ob’);
axis equal;
hold on;
scatter(xbdy(:,1),xbdy(:,2),’or’);
hold off;
end
The picture show, this is exactly how I want it too look for later usage… Now I wanted to plot the above function (for later usage too…) on the unit disc:
% The function
u = @(x) (5/4)*(1-x(:,1).^2-x(:,2).^2).*sin(pi*x(:,1))+1;
% Get some evaluation points …
N = 30;
[xint,xbdy,x]=GetCircleGrid(-1,1,N); % … in the unit disk
% Reshape evaluation points
X = reshape(x(:,1),N,N); % not working well…
Y = reshape(x(:,2),N,N); % not working well…
U = reshape(u(x),N,N); % evaluate the function
% Plot the function as well as the evaluationpoints
figure(1)
surf(X,Y,U,’FaceAlpha’,0.5,’EdgeColor’,’interp’);
colormap cool; camlight; lighting gouraud; material dull;
title(‘f(x,y)’)
hold on;
scatter3(X,Y,zeros(N,N),’og’);
hold off;
As you can see the plot has some weird lines that are not wanted. How should I sort the points in x to get a proper surf plot? In addition to that I wanted to plot the inner points in a different collor than the boundary points but since the number of points inside and the number of points on the boundary of the disc are not square numbers I don’t know how to use reshape for xint and xboundary…
Thank you very much for your help! Kind regard, Max.Hello! I am currently trying to plot the function
on the unit disk . I wrote a function to get some evaluationpoints inside and on the boundary of the disk but when I plot the function on it I get very weird results. I already discussed a similar problem in a previous question and a nice person explained to me that the problem was the way my points where sorted in the matrix and therefore the reshaping didn’t work as desired. Since I get the same problem in the surf plot again, I am quite sure that this is the same case here.
In the function that I wrote to generate points I first started to lay a grid on a square. After that I sort out every point that is outside of the circle or that is on the boundary of the circle. Lastly I put points on the boundary of the circle. The function takes parameters and . First two parameters are the bounds for the square . The parameter is going to be the squareroot of the number of Points we will end up with. The function gives back Matrices xint, xbdy and x. xint holds the interior points and xbdy the points on the boundary of the circle. x should have both points together but there is still the problem on how I sort these… The rows of these matrices are points in that means e.g. x is gonna be a Matrix.
[~,~,~] = GetCircleGrid(-1,1,30); %Example
function [xint,xbdy,x] = GetCircleGrid(a,b,N)
% Radius of Circle
r = (b-a)/2;
% Centerpoint of Circle
x0 = a+r;
y0 = a+r;
% First get a Grid on the whole square
[xsqr1,xsqr2] = meshgrid(linspace(a,b,N),linspace(a,b,N));
xsqr = [xsqr1(:),xsqr2(:)];
% Now get rid of Points outside of Circle
k=1; % counter
for j=1:N^2
if sqrt((xsqr(j,1)-x0)^2+(xsqr(j,2)-y0)^2) < r % If distance from centerpoint is < r
xint(k,:) = xsqr(j,:);
k=k+1;
end
end
NB = N^2-(k-1); % Number of points for boundary so we end up with N^2 points in total
% Get the Boundarypoints
theta = linspace(0,2*pi,NB);
xbdy = zeros(NB,2);
xbdy(:,1) = x0 + r*cos(theta)’;
xbdy(:,2) = y0 + r*sin(theta)’;
x = sortrows([xint; xbdy]); % How to sort these…? 🙁
scatter(xint(:,1),xint(:,2),’ob’);
axis equal;
hold on;
scatter(xbdy(:,1),xbdy(:,2),’or’);
hold off;
end
The picture show, this is exactly how I want it too look for later usage… Now I wanted to plot the above function (for later usage too…) on the unit disc:
% The function
u = @(x) (5/4)*(1-x(:,1).^2-x(:,2).^2).*sin(pi*x(:,1))+1;
% Get some evaluation points …
N = 30;
[xint,xbdy,x]=GetCircleGrid(-1,1,N); % … in the unit disk
% Reshape evaluation points
X = reshape(x(:,1),N,N); % not working well…
Y = reshape(x(:,2),N,N); % not working well…
U = reshape(u(x),N,N); % evaluate the function
% Plot the function as well as the evaluationpoints
figure(1)
surf(X,Y,U,’FaceAlpha’,0.5,’EdgeColor’,’interp’);
colormap cool; camlight; lighting gouraud; material dull;
title(‘f(x,y)’)
hold on;
scatter3(X,Y,zeros(N,N),’og’);
hold off;
As you can see the plot has some weird lines that are not wanted. How should I sort the points in x to get a proper surf plot? In addition to that I wanted to plot the inner points in a different collor than the boundary points but since the number of points inside and the number of points on the boundary of the disc are not square numbers I don’t know how to use reshape for xint and xboundary…
Thank you very much for your help! Kind regard, Max. Hello! I am currently trying to plot the function
on the unit disk . I wrote a function to get some evaluationpoints inside and on the boundary of the disk but when I plot the function on it I get very weird results. I already discussed a similar problem in a previous question and a nice person explained to me that the problem was the way my points where sorted in the matrix and therefore the reshaping didn’t work as desired. Since I get the same problem in the surf plot again, I am quite sure that this is the same case here.
In the function that I wrote to generate points I first started to lay a grid on a square. After that I sort out every point that is outside of the circle or that is on the boundary of the circle. Lastly I put points on the boundary of the circle. The function takes parameters and . First two parameters are the bounds for the square . The parameter is going to be the squareroot of the number of Points we will end up with. The function gives back Matrices xint, xbdy and x. xint holds the interior points and xbdy the points on the boundary of the circle. x should have both points together but there is still the problem on how I sort these… The rows of these matrices are points in that means e.g. x is gonna be a Matrix.
[~,~,~] = GetCircleGrid(-1,1,30); %Example
function [xint,xbdy,x] = GetCircleGrid(a,b,N)
% Radius of Circle
r = (b-a)/2;
% Centerpoint of Circle
x0 = a+r;
y0 = a+r;
% First get a Grid on the whole square
[xsqr1,xsqr2] = meshgrid(linspace(a,b,N),linspace(a,b,N));
xsqr = [xsqr1(:),xsqr2(:)];
% Now get rid of Points outside of Circle
k=1; % counter
for j=1:N^2
if sqrt((xsqr(j,1)-x0)^2+(xsqr(j,2)-y0)^2) < r % If distance from centerpoint is < r
xint(k,:) = xsqr(j,:);
k=k+1;
end
end
NB = N^2-(k-1); % Number of points for boundary so we end up with N^2 points in total
% Get the Boundarypoints
theta = linspace(0,2*pi,NB);
xbdy = zeros(NB,2);
xbdy(:,1) = x0 + r*cos(theta)’;
xbdy(:,2) = y0 + r*sin(theta)’;
x = sortrows([xint; xbdy]); % How to sort these…? 🙁
scatter(xint(:,1),xint(:,2),’ob’);
axis equal;
hold on;
scatter(xbdy(:,1),xbdy(:,2),’or’);
hold off;
end
The picture show, this is exactly how I want it too look for later usage… Now I wanted to plot the above function (for later usage too…) on the unit disc:
% The function
u = @(x) (5/4)*(1-x(:,1).^2-x(:,2).^2).*sin(pi*x(:,1))+1;
% Get some evaluation points …
N = 30;
[xint,xbdy,x]=GetCircleGrid(-1,1,N); % … in the unit disk
% Reshape evaluation points
X = reshape(x(:,1),N,N); % not working well…
Y = reshape(x(:,2),N,N); % not working well…
U = reshape(u(x),N,N); % evaluate the function
% Plot the function as well as the evaluationpoints
figure(1)
surf(X,Y,U,’FaceAlpha’,0.5,’EdgeColor’,’interp’);
colormap cool; camlight; lighting gouraud; material dull;
title(‘f(x,y)’)
hold on;
scatter3(X,Y,zeros(N,N),’og’);
hold off;
As you can see the plot has some weird lines that are not wanted. How should I sort the points in x to get a proper surf plot? In addition to that I wanted to plot the inner points in a different collor than the boundary points but since the number of points inside and the number of points on the boundary of the disc are not square numbers I don’t know how to use reshape for xint and xboundary…
Thank you very much for your help! Kind regard, Max. surf, plotting, surface, matrix, reshape MATLAB Answers — New Questions
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