In MATLAB, I have an abstract class called "Vehicle" and concrete subclasses like "Car" and "Bike". In my "Garage" class, the "vehicle" property is set dynamically at runtime by reading a config script (e.g., "garageConfig.m"). Right now, I use a variable "vehicleType" in "garageConfig.m" to determine which subclass to instantiate. But the problem is I have to:Run "garageConfig.m" to get the value for "vehicleType", then set the property "vehicle" to the correct child (e.g., obj.vehicle = Bike()).Then run "garageConfig.m" again to populate the property values (like "vehicle.color", "vehicle.wheels", etc.) for the instantiated child class.
Is there a better way to do this, so I don’t have to run the config script twice to set up the "vehicle" object and its properties?

% Vehicle.m
classdef (Abstract) Vehicle
properties
color = "white";
wheels = 4;
end
end

% Car.m
classdef Car < Vehicle
end

% Bike.m
classdef Bike < Vehicle
properties
hasBell = false;
end
end

% Garage.m
classdef Garage
properties
vehicle % will be Vehicle
end
methods
function obj = Garage(configFile)
% First run: get vehicleType
run(configFile); % loads vehicleType and vehicle properties

% Instantiate correct subclass
switch vehicleType
case 1
obj.vehicle = Car();
case 2
obj.vehicle = Bike();
end

% Now, to assign properties, need to run the config file again:
run(configFile); % loads vehicle.color, vehicle.wheels, etc.

% Assign properties
obj.vehicle.color = vehicle.color;
obj.vehicle.wheels = vehicle.wheels;
if isa(obj.vehicle, ‘Bike’)
obj.vehicle.hasBell = vehicle.hasBell;
end
end
end
end

% garageConfig.m
vehicleType = 2; % 1 for Car, 2 for Bike
vehicle.color = "red";
vehicle.wheels = 2;
vehicle.hasBell = true;

% Usage:
g = Garage(‘garageConfig.m’);In MATLAB, I have an abstract class called "Vehicle" and concrete subclasses like "Car" and "Bike". In my "Garage" class, the "vehicle" property is set dynamically at runtime by reading a config script (e.g., "garageConfig.m"). Right now, I use a variable "vehicleType" in "garageConfig.m" to determine which subclass to instantiate. But the problem is I have to:Run "garageConfig.m" to get the value for "vehicleType", then set the property "vehicle" to the correct child (e.g., obj.vehicle = Bike()).Then run "garageConfig.m" again to populate the property values (like "vehicle.color", "vehicle.wheels", etc.) for the instantiated child class.
Is there a better way to do this, so I don’t have to run the config script twice to set up the "vehicle" object and its properties?

% Vehicle.m
classdef (Abstract) Vehicle
properties
color = "white";
wheels = 4;
end
end

% Car.m
classdef Car < Vehicle
end

% Bike.m
classdef Bike < Vehicle
properties
hasBell = false;
end
end

% Garage.m
classdef Garage
properties
vehicle % will be Vehicle
end
methods
function obj = Garage(configFile)
% First run: get vehicleType
run(configFile); % loads vehicleType and vehicle properties

% Instantiate correct subclass
switch vehicleType
case 1
obj.vehicle = Car();
case 2
obj.vehicle = Bike();
end

% Now, to assign properties, need to run the config file again:
run(configFile); % loads vehicle.color, vehicle.wheels, etc.

% Assign properties
obj.vehicle.color = vehicle.color;
obj.vehicle.wheels = vehicle.wheels;
if isa(obj.vehicle, ‘Bike’)
obj.vehicle.hasBell = vehicle.hasBell;
end
end
end
end

% garageConfig.m
vehicleType = 2; % 1 for Car, 2 for Bike
vehicle.color = "red";
vehicle.wheels = 2;
vehicle.hasBell = true;

% Usage:
g = Garage(‘garageConfig.m’); In MATLAB, I have an abstract class called "Vehicle" and concrete subclasses like "Car" and "Bike". In my "Garage" class, the "vehicle" property is set dynamically at runtime by reading a config script (e.g., "garageConfig.m"). Right now, I use a variable "vehicleType" in "garageConfig.m" to determine which subclass to instantiate. But the problem is I have to:Run "garageConfig.m" to get the value for "vehicleType", then set the property "vehicle" to the correct child (e.g., obj.vehicle = Bike()).Then run "garageConfig.m" again to populate the property values (like "vehicle.color", "vehicle.wheels", etc.) for the instantiated child class.
Is there a better way to do this, so I don’t have to run the config script twice to set up the "vehicle" object and its properties?

% Vehicle.m
classdef (Abstract) Vehicle
properties
color = "white";
wheels = 4;
end
end

% Car.m
classdef Car < Vehicle
end

% Bike.m
classdef Bike < Vehicle
properties
hasBell = false;
end
end

% Garage.m
classdef Garage
properties
vehicle % will be Vehicle
end
methods
function obj = Garage(configFile)
% First run: get vehicleType
run(configFile); % loads vehicleType and vehicle properties

% Instantiate correct subclass
switch vehicleType
case 1
obj.vehicle = Car();
case 2
obj.vehicle = Bike();
end

% Now, to assign properties, need to run the config file again:
run(configFile); % loads vehicle.color, vehicle.wheels, etc.

% Assign properties
obj.vehicle.color = vehicle.color;
obj.vehicle.wheels = vehicle.wheels;
if isa(obj.vehicle, ‘Bike’)
obj.vehicle.hasBell = vehicle.hasBell;
end
end
end
end

% garageConfig.m
vehicleType = 2; % 1 for Car, 2 for Bike
vehicle.color = "red";
vehicle.wheels = 2;
vehicle.hasBell = true;

% Usage:
g = Garage(‘garageConfig.m’); abstractclass, subclass, classconfig MATLAB Answers — New Questions

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I am using an Arduino UnoR4Wifi to read i2c accelerometer (LiS3DH) in Matlab and Simulink. This works ok using i2c Bus 0, with the accelerometer wires individually plugged into the board (A4,A5,3.3v,Gr). But I want to use the in-built ‘Qwiic’ connector on the Arduino board (aka ‘StemmaQT’ connector) for convenient plug-and-play access so I can quickly attach/detach sensors during an experiment.
However, when i attach the accelerometer to the Qwiic connector (Bus 1) it is not recognised by Matlab. I have tried using pull-down resistors attached to the SDA/SCL connections to activate Bus 1, to no avail. I am not sure if this is a Matlab software limitation, or an Arduino hardware limitation. Matlab suggests Bus 1 is not valid (see code below with no accelerometer attached), so i am guessing it might be a software limitation.
Any advice appreciated!
Raymond

>
> a = arduino(‘COM7’, ‘UnoR4WiFi’, ‘Libraries’, ‘I2C’);
>> scanI2CBus(a,0)
Device not detected on I2C Bus 0. Make sure the I2C device is properly connected to pins A4(SDA) and A5(SCL).
>> scanI2CBus(a,1)
Invalid I2C bus ID. Valid bus IDs are 0I am using an Arduino UnoR4Wifi to read i2c accelerometer (LiS3DH) in Matlab and Simulink. This works ok using i2c Bus 0, with the accelerometer wires individually plugged into the board (A4,A5,3.3v,Gr). But I want to use the in-built ‘Qwiic’ connector on the Arduino board (aka ‘StemmaQT’ connector) for convenient plug-and-play access so I can quickly attach/detach sensors during an experiment.
However, when i attach the accelerometer to the Qwiic connector (Bus 1) it is not recognised by Matlab. I have tried using pull-down resistors attached to the SDA/SCL connections to activate Bus 1, to no avail. I am not sure if this is a Matlab software limitation, or an Arduino hardware limitation. Matlab suggests Bus 1 is not valid (see code below with no accelerometer attached), so i am guessing it might be a software limitation.
Any advice appreciated!
Raymond

>
> a = arduino(‘COM7’, ‘UnoR4WiFi’, ‘Libraries’, ‘I2C’);
>> scanI2CBus(a,0)
Device not detected on I2C Bus 0. Make sure the I2C device is properly connected to pins A4(SDA) and A5(SCL).
>> scanI2CBus(a,1)
Invalid I2C bus ID. Valid bus IDs are 0 I am using an Arduino UnoR4Wifi to read i2c accelerometer (LiS3DH) in Matlab and Simulink. This works ok using i2c Bus 0, with the accelerometer wires individually plugged into the board (A4,A5,3.3v,Gr). But I want to use the in-built ‘Qwiic’ connector on the Arduino board (aka ‘StemmaQT’ connector) for convenient plug-and-play access so I can quickly attach/detach sensors during an experiment.
However, when i attach the accelerometer to the Qwiic connector (Bus 1) it is not recognised by Matlab. I have tried using pull-down resistors attached to the SDA/SCL connections to activate Bus 1, to no avail. I am not sure if this is a Matlab software limitation, or an Arduino hardware limitation. Matlab suggests Bus 1 is not valid (see code below with no accelerometer attached), so i am guessing it might be a software limitation.
Any advice appreciated!
Raymond

>
> a = arduino(‘COM7’, ‘UnoR4WiFi’, ‘Libraries’, ‘I2C’);
>> scanI2CBus(a,0)
Device not detected on I2C Bus 0. Make sure the I2C device is properly connected to pins A4(SDA) and A5(SCL).
>> scanI2CBus(a,1)
Invalid I2C bus ID. Valid bus IDs are 0 arduino, i2c, accelerometer, lis3dh, qwiic, stemmaqt MATLAB Answers — New Questions

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The Matlab online docs (e.g., https://www.mathworks.com/help/?s_tid=user_nav_help ) showing in dark mode on mathworks.com are showing in dark mode for me. Is there a site setting to switch them back to light mode?The Matlab online docs (e.g., https://www.mathworks.com/help/?s_tid=user_nav_help ) showing in dark mode on mathworks.com are showing in dark mode for me. Is there a site setting to switch them back to light mode? The Matlab online docs (e.g., https://www.mathworks.com/help/?s_tid=user_nav_help ) showing in dark mode on mathworks.com are showing in dark mode for me. Is there a site setting to switch them back to light mode? matlab MATLAB Answers — New Questions

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What is a safe method to check, where a specific function exists in Matlab’s path? It should not matter, if the function is an M, P or MEX file.
Actually, this is a job for which() . To avoid collisions with local variables, it should be hidden in a function:
function Reply = safeWhich(varargin)
Reply = which(varargin{:});
end
This fails for ‘varargin’, as expected:
safeWhich(‘varargin’)
But there are further traps
safeWhich(‘R’) % Same for ‘P’
In Matlab R2018b under Windows I get:
‘C:Program FilesMATLABR2018btoolboxmatlabcodetools@mtreemtree.m % mtree method’
The appended comment allowed to exclude the output by checking, if a corrensponding file exists:
function Reply = safeWhich_2(varargin)
Reply = which(varargin{:});
Reply = cellstr(Reply);
Reply = Reply(isfile(Reply)); % Worked in R2018b, no effect in R2025a
end

safeWhich_2(‘R’)
The exist() command does have the power to find functions properly, but it does not reveal where.
The old function depfun() was replaced by the ugly matlab.codetools.requiredFilesAndProducts(). I could search in the corresponding code, couldn’t I? This function uses the code find here internally: "toolboxmatlabdepfun+matlab+depfun+internal+whichcallWhich.m". Here I find 91 functions and 11.3 MB of code. One function looks like this:
% 10^(-18) is effective zero in terms of possibility, which requries
% log(10^18)/log(26+10+1) = 12 random letters, digits, or underscores.
function klno6phn_9faskf_na = callWhich(asm_foyan_knaouie8)
klno6phn_9faskf_na = which(asm_foyan_knaouie8);
end
Obviously MathWorks struggles with comparable problems.
The profiler shows, that matlab.codetools.requiredFilesAndProducts() calls 207 subfunctions (R2018b).
See the discussion: https://www.mathworks.com/matlabcentral/discussions/ideas/887763-i-have-been-a-matlab-loyalist-for-25-years . The complexity explodes, such that a simple task like searching a function file needs a pile of exceptions and indirections.What is a safe method to check, where a specific function exists in Matlab’s path? It should not matter, if the function is an M, P or MEX file.
Actually, this is a job for which() . To avoid collisions with local variables, it should be hidden in a function:
function Reply = safeWhich(varargin)
Reply = which(varargin{:});
end
This fails for ‘varargin’, as expected:
safeWhich(‘varargin’)
But there are further traps
safeWhich(‘R’) % Same for ‘P’
In Matlab R2018b under Windows I get:
‘C:Program FilesMATLABR2018btoolboxmatlabcodetools@mtreemtree.m % mtree method’
The appended comment allowed to exclude the output by checking, if a corrensponding file exists:
function Reply = safeWhich_2(varargin)
Reply = which(varargin{:});
Reply = cellstr(Reply);
Reply = Reply(isfile(Reply)); % Worked in R2018b, no effect in R2025a
end

safeWhich_2(‘R’)
The exist() command does have the power to find functions properly, but it does not reveal where.
The old function depfun() was replaced by the ugly matlab.codetools.requiredFilesAndProducts(). I could search in the corresponding code, couldn’t I? This function uses the code find here internally: "toolboxmatlabdepfun+matlab+depfun+internal+whichcallWhich.m". Here I find 91 functions and 11.3 MB of code. One function looks like this:
% 10^(-18) is effective zero in terms of possibility, which requries
% log(10^18)/log(26+10+1) = 12 random letters, digits, or underscores.
function klno6phn_9faskf_na = callWhich(asm_foyan_knaouie8)
klno6phn_9faskf_na = which(asm_foyan_knaouie8);
end
Obviously MathWorks struggles with comparable problems.
The profiler shows, that matlab.codetools.requiredFilesAndProducts() calls 207 subfunctions (R2018b).
See the discussion: https://www.mathworks.com/matlabcentral/discussions/ideas/887763-i-have-been-a-matlab-loyalist-for-25-years . The complexity explodes, such that a simple task like searching a function file needs a pile of exceptions and indirections. What is a safe method to check, where a specific function exists in Matlab’s path? It should not matter, if the function is an M, P or MEX file.
Actually, this is a job for which() . To avoid collisions with local variables, it should be hidden in a function:
function Reply = safeWhich(varargin)
Reply = which(varargin{:});
end
This fails for ‘varargin’, as expected:
safeWhich(‘varargin’)
But there are further traps
safeWhich(‘R’) % Same for ‘P’
In Matlab R2018b under Windows I get:
‘C:Program FilesMATLABR2018btoolboxmatlabcodetools@mtreemtree.m % mtree method’
The appended comment allowed to exclude the output by checking, if a corrensponding file exists:
function Reply = safeWhich_2(varargin)
Reply = which(varargin{:});
Reply = cellstr(Reply);
Reply = Reply(isfile(Reply)); % Worked in R2018b, no effect in R2025a
end

safeWhich_2(‘R’)
The exist() command does have the power to find functions properly, but it does not reveal where.
The old function depfun() was replaced by the ugly matlab.codetools.requiredFilesAndProducts(). I could search in the corresponding code, couldn’t I? This function uses the code find here internally: "toolboxmatlabdepfun+matlab+depfun+internal+whichcallWhich.m". Here I find 91 functions and 11.3 MB of code. One function looks like this:
% 10^(-18) is effective zero in terms of possibility, which requries
% log(10^18)/log(26+10+1) = 12 random letters, digits, or underscores.
function klno6phn_9faskf_na = callWhich(asm_foyan_knaouie8)
klno6phn_9faskf_na = which(asm_foyan_knaouie8);
end
Obviously MathWorks struggles with comparable problems.
The profiler shows, that matlab.codetools.requiredFilesAndProducts() calls 207 subfunctions (R2018b).
See the discussion: https://www.mathworks.com/matlabcentral/discussions/ideas/887763-i-have-been-a-matlab-loyalist-for-25-years . The complexity explodes, such that a simple task like searching a function file needs a pile of exceptions and indirections. which, exist, required products, file MATLAB Answers — New Questions

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I am using argument validation in a function that has multiple inputs including Name-Value pair arguments. When I set a breakpoint at the beginning of this function, only the first argument appears in the MATLAB R2025a Workspace immediately. The rest do not appear until after the arguments block finishes running. However, if I remove the Name-Value arguments, all of the values appear immediately.
Why does this occur? Is there a workaround?I am using argument validation in a function that has multiple inputs including Name-Value pair arguments. When I set a breakpoint at the beginning of this function, only the first argument appears in the MATLAB R2025a Workspace immediately. The rest do not appear until after the arguments block finishes running. However, if I remove the Name-Value arguments, all of the values appear immediately.
Why does this occur? Is there a workaround? I am using argument validation in a function that has multiple inputs including Name-Value pair arguments. When I set a breakpoint at the beginning of this function, only the first argument appears in the MATLAB R2025a Workspace immediately. The rest do not appear until after the arguments block finishes running. However, if I remove the Name-Value arguments, all of the values appear immediately.
Why does this occur? Is there a workaround? namevalue, arguments, validation, breakpoint, workspace MATLAB Answers — New Questions

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I am printing a MATLAB script to PDF in MATLAB R2025a, but the header with the timestamp is missing. This header was included automatically in MATLAB R2024b. How can I add the header back in R2025a?I am printing a MATLAB script to PDF in MATLAB R2025a, but the header with the timestamp is missing. This header was included automatically in MATLAB R2024b. How can I add the header back in R2025a? I am printing a MATLAB script to PDF in MATLAB R2025a, but the header with the timestamp is missing. This header was included automatically in MATLAB R2024b. How can I add the header back in R2025a? header, print, matlab, editor, pdf, date, filename MATLAB Answers — New Questions

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I’ve been developing a custom controller using this toolbox, and everything has been working well after following the examples provided in the documentation.
However, after this last Tuesday, April 14th 2026, I attempted to monitor and tune my controller, and it threw an error saying the build failed and I need to go through the toolbox setup again (this is the first time I’ve gotten this error). I did this, and that is when problems developed. When using a simulink plant simulation for the PX4 SITL Host, the plant can no longer run in real time. It runs at about a quarter of the speed. I booted up the PX4 monitor and tune with plant example, and even that example is now running slowly too! Is it possible the recent security update affected TCP communication between Windows and the WSL network adapter?
Also, I am on R2025a.I’ve been developing a custom controller using this toolbox, and everything has been working well after following the examples provided in the documentation.
However, after this last Tuesday, April 14th 2026, I attempted to monitor and tune my controller, and it threw an error saying the build failed and I need to go through the toolbox setup again (this is the first time I’ve gotten this error). I did this, and that is when problems developed. When using a simulink plant simulation for the PX4 SITL Host, the plant can no longer run in real time. It runs at about a quarter of the speed. I booted up the PX4 monitor and tune with plant example, and even that example is now running slowly too! Is it possible the recent security update affected TCP communication between Windows and the WSL network adapter?
Also, I am on R2025a. I’ve been developing a custom controller using this toolbox, and everything has been working well after following the examples provided in the documentation.
However, after this last Tuesday, April 14th 2026, I attempted to monitor and tune my controller, and it threw an error saying the build failed and I need to go through the toolbox setup again (this is the first time I’ve gotten this error). I did this, and that is when problems developed. When using a simulink plant simulation for the PX4 SITL Host, the plant can no longer run in real time. It runs at about a quarter of the speed. I booted up the PX4 monitor and tune with plant example, and even that example is now running slowly too! Is it possible the recent security update affected TCP communication between Windows and the WSL network adapter?
Also, I am on R2025a. px4, uav toolbox support package, monitor and tune, simulink, plant MATLAB Answers — New Questions

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I want to find out the Noise and vibration of an EV motor PMSM by given few input data and getting results. So what is the process in the matlab/simulink to get the resultsI want to find out the Noise and vibration of an EV motor PMSM by given few input data and getting results. So what is the process in the matlab/simulink to get the results I want to find out the Noise and vibration of an EV motor PMSM by given few input data and getting results. So what is the process in the matlab/simulink to get the results nvh of an ev motor MATLAB Answers — New Questions

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Only version 2026a appears available for download as a trial.
I want version 2025b, but it does not appear as an option at https://www.mathworks.com/downloads/web_downloads/13799194.Only version 2026a appears available for download as a trial.
I want version 2025b, but it does not appear as an option at https://www.mathworks.com/downloads/web_downloads/13799194. Only version 2026a appears available for download as a trial.
I want version 2025b, but it does not appear as an option at https://www.mathworks.com/downloads/web_downloads/13799194. r2025a MATLAB Answers — New Questions

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I’m facing the issue i.e., I’m running the polyspace code prover throught the commend prompt. I used all the configuration in the option.txt file. Through that option.txt file i’m start compling by using this cmd ("C:Program FilesPOLYSPACER2023apolyspacebinpolyspace-code-prover" ^ -options-file Options.txt ^ -scheduler CHE6-SV00106 ^ -results-dir "C:UsersaallimutDocumentsSWEET500cb1146_vcore_main_devResult"). Compliation is done sucessfully and the code is pushed to the server. After successful complition of run I Checked the result, It’s only showing the code metrix, not showing any checks in the dashboard.I’m facing the issue i.e., I’m running the polyspace code prover throught the commend prompt. I used all the configuration in the option.txt file. Through that option.txt file i’m start compling by using this cmd ("C:Program FilesPOLYSPACER2023apolyspacebinpolyspace-code-prover" ^ -options-file Options.txt ^ -scheduler CHE6-SV00106 ^ -results-dir "C:UsersaallimutDocumentsSWEET500cb1146_vcore_main_devResult"). Compliation is done sucessfully and the code is pushed to the server. After successful complition of run I Checked the result, It’s only showing the code metrix, not showing any checks in the dashboard. I’m facing the issue i.e., I’m running the polyspace code prover throught the commend prompt. I used all the configuration in the option.txt file. Through that option.txt file i’m start compling by using this cmd ("C:Program FilesPOLYSPACER2023apolyspacebinpolyspace-code-prover" ^ -options-file Options.txt ^ -scheduler CHE6-SV00106 ^ -results-dir "C:UsersaallimutDocumentsSWEET500cb1146_vcore_main_devResult"). Compliation is done sucessfully and the code is pushed to the server. After successful complition of run I Checked the result, It’s only showing the code metrix, not showing any checks in the dashboard. no checks found MATLAB Answers — New Questions

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