Hello,
I’m using Simscape language to make a customized component. Here is the code:

%—————————————————-

component Plant
%% Physical model

nodes
T = foundation.mechanical.translational.translational; %T:right
R = foundation.mechanical.rotational.rotational; % R:right
end

parameters
m = { 2.0, ‘kg’ }; % Mass of the robot
J = {0.15625, ‘kg*m^2’ }; %Moment of inertia
rw = {0.1, ‘m’}; % Wheel radius
Wd = {0.4, ‘m’}; % Chassis width between wheels
init_s = {0, ‘m’}; % Intial distance,s
init_theta = {0, ‘rad’}; % Initial orientation,theta
end

variables
v = { 0, ‘m/s’ }; %%translational velocity
w = { 0, ‘rad/s’ }; %rotational velocity
fl = {0,’kg*m/s^2′}; % force left
fr = {0,’kg*m/s^2′}; % force right or kg*m/s^2
theta = {0,’rad’}; % orientation
s = {0, ‘m’}; % distance of the path between 2 points
end

function setup
across( v, T.v, []);
across( w, R.w, [] );
through(fr, T.f, [] );
through(fl, T.f, [] );
theta = init_theta;
s = init_s;
end

equations
v == s.der;
w == theta.der;
v.der == (fr + fl)/m;
w.der == (fr – fl)*rw/J;
end
end
%—————————————————
It seems OK when I build the component without any error but when I compose the component in Simulink environment, the error appears to be like:
————————————————————-
Nonlinear solver: Linear Algebra error. Failed to solve using iteration matrix.
Initial conditions solve failed to converge.
Dependency found among topology equations. Check for missing reference node.
————————————————————-
Any advice?
Regards,
AziziHello,
I’m using Simscape language to make a customized component. Here is the code:

%—————————————————-

component Plant
%% Physical model

nodes
T = foundation.mechanical.translational.translational; %T:right
R = foundation.mechanical.rotational.rotational; % R:right
end

parameters
m = { 2.0, ‘kg’ }; % Mass of the robot
J = {0.15625, ‘kg*m^2’ }; %Moment of inertia
rw = {0.1, ‘m’}; % Wheel radius
Wd = {0.4, ‘m’}; % Chassis width between wheels
init_s = {0, ‘m’}; % Intial distance,s
init_theta = {0, ‘rad’}; % Initial orientation,theta
end

variables
v = { 0, ‘m/s’ }; %%translational velocity
w = { 0, ‘rad/s’ }; %rotational velocity
fl = {0,’kg*m/s^2′}; % force left
fr = {0,’kg*m/s^2′}; % force right or kg*m/s^2
theta = {0,’rad’}; % orientation
s = {0, ‘m’}; % distance of the path between 2 points
end

function setup
across( v, T.v, []);
across( w, R.w, [] );
through(fr, T.f, [] );
through(fl, T.f, [] );
theta = init_theta;
s = init_s;
end

equations
v == s.der;
w == theta.der;
v.der == (fr + fl)/m;
w.der == (fr – fl)*rw/J;
end
end
%—————————————————
It seems OK when I build the component without any error but when I compose the component in Simulink environment, the error appears to be like:
————————————————————-
Nonlinear solver: Linear Algebra error. Failed to solve using iteration matrix.
Initial conditions solve failed to converge.
Dependency found among topology equations. Check for missing reference node.
————————————————————-
Any advice?
Regards,
Azizi Hello,
I’m using Simscape language to make a customized component. Here is the code:

%—————————————————-

component Plant
%% Physical model

nodes
T = foundation.mechanical.translational.translational; %T:right
R = foundation.mechanical.rotational.rotational; % R:right
end

parameters
m = { 2.0, ‘kg’ }; % Mass of the robot
J = {0.15625, ‘kg*m^2’ }; %Moment of inertia
rw = {0.1, ‘m’}; % Wheel radius
Wd = {0.4, ‘m’}; % Chassis width between wheels
init_s = {0, ‘m’}; % Intial distance,s
init_theta = {0, ‘rad’}; % Initial orientation,theta
end

variables
v = { 0, ‘m/s’ }; %%translational velocity
w = { 0, ‘rad/s’ }; %rotational velocity
fl = {0,’kg*m/s^2′}; % force left
fr = {0,’kg*m/s^2′}; % force right or kg*m/s^2
theta = {0,’rad’}; % orientation
s = {0, ‘m’}; % distance of the path between 2 points
end

function setup
across( v, T.v, []);
across( w, R.w, [] );
through(fr, T.f, [] );
through(fl, T.f, [] );
theta = init_theta;
s = init_s;
end

equations
v == s.der;
w == theta.der;
v.der == (fr + fl)/m;
w.der == (fr – fl)*rw/J;
end
end
%—————————————————
It seems OK when I build the component without any error but when I compose the component in Simulink environment, the error appears to be like:
————————————————————-
Nonlinear solver: Linear Algebra error. Failed to solve using iteration matrix.
Initial conditions solve failed to converge.
Dependency found among topology equations. Check for missing reference node.
————————————————————-
Any advice?
Regards,
Azizi simscape language, simulation error, simscape MATLAB Answers — New Questions

​

If I use the audiostreamer ‘play’ function, I can add additional samples to the output queue by calling ‘play’ when NumberPlayerSamples gets low. But this doesn’t work the same way for the ‘playrec’ function. If I call ‘playrec’ while there are samples in the output queue, it will not add to the output queue, but instead it replaces the output queue with the new samples. Thus, whatever was in the output queue previously was lost.
Is there some reason that it has to be that way? I attached some test code that sends multiple ASIO buffers of pink noise to the output queue and then it starts copying samples from the input to the output. I would expect that the latency from the input to the output would increase if I added more samples up front. Instead I see that it only outputs one buffer of pink noise and then starts copying the samples.
So, bug or intentional? (I vote bug)If I use the audiostreamer ‘play’ function, I can add additional samples to the output queue by calling ‘play’ when NumberPlayerSamples gets low. But this doesn’t work the same way for the ‘playrec’ function. If I call ‘playrec’ while there are samples in the output queue, it will not add to the output queue, but instead it replaces the output queue with the new samples. Thus, whatever was in the output queue previously was lost.
Is there some reason that it has to be that way? I attached some test code that sends multiple ASIO buffers of pink noise to the output queue and then it starts copying samples from the input to the output. I would expect that the latency from the input to the output would increase if I added more samples up front. Instead I see that it only outputs one buffer of pink noise and then starts copying the samples.
So, bug or intentional? (I vote bug) If I use the audiostreamer ‘play’ function, I can add additional samples to the output queue by calling ‘play’ when NumberPlayerSamples gets low. But this doesn’t work the same way for the ‘playrec’ function. If I call ‘playrec’ while there are samples in the output queue, it will not add to the output queue, but instead it replaces the output queue with the new samples. Thus, whatever was in the output queue previously was lost.
Is there some reason that it has to be that way? I attached some test code that sends multiple ASIO buffers of pink noise to the output queue and then it starts copying samples from the input to the output. I would expect that the latency from the input to the output would increase if I added more samples up front. Instead I see that it only outputs one buffer of pink noise and then starts copying the samples.
So, bug or intentional? (I vote bug) audiostreamer, playrec MATLAB Answers — New Questions

​

I am having an issue with two blocks on SimElectrical:

1) From a simple sine wave input, how do I increase samples per channel to above 3 such that I can use the Peak Finder block?

2) My bandpass filter (attached to my sine wave output) is giving me an error as follows:
Output port 1 of ‘Circuit/Bandpass Filter’ is a one dimensional vector with 1 elements.’

Any help would be appreciated,

J CI am having an issue with two blocks on SimElectrical:

1) From a simple sine wave input, how do I increase samples per channel to above 3 such that I can use the Peak Finder block?

2) My bandpass filter (attached to my sine wave output) is giving me an error as follows:
Output port 1 of ‘Circuit/Bandpass Filter’ is a one dimensional vector with 1 elements.’

Any help would be appreciated,

J C I am having an issue with two blocks on SimElectrical:

1) From a simple sine wave input, how do I increase samples per channel to above 3 such that I can use the Peak Finder block?

2) My bandpass filter (attached to my sine wave output) is giving me an error as follows:
Output port 1 of ‘Circuit/Bandpass Filter’ is a one dimensional vector with 1 elements.’

Any help would be appreciated,

J C simulink, filter, filter design, sine wave MATLAB Answers — New Questions

​

Yes i know the question has been ask before, but since i’m not allowed to comment, im asking it again.
Yes i am Admin/root
and Yes permissions are 777 for /usr/MATLAB
No the link did not provide an Answer

Thanks for the helpYes i know the question has been ask before, but since i’m not allowed to comment, im asking it again.
Yes i am Admin/root
and Yes permissions are 777 for /usr/MATLAB
No the link did not provide an Answer

Thanks for the help Yes i know the question has been ask before, but since i’m not allowed to comment, im asking it again.
Yes i am Admin/root
and Yes permissions are 777 for /usr/MATLAB
No the link did not provide an Answer

Thanks for the help r2025a, updating MATLAB Answers — New Questions

​

clearvars -except Radius_list Six_plots

Circle_num = 4

nlist = 1;
%Six_plots = F_six_plots(Circle_num, Radius_list);
Six_plots;

sz = size(Six_plots,2);

Plot_num(1:sz) = compassplot(ones)
jplot = 1;

while jplot < sz
Plot_num(nlist) = compassplot(Six_plots(1:nlist));
nlist = nlist+1;
jplot = jplot+1
end
X = Plot_num
Stepping thru the while works. Plot_num(nlist) is fine
X is all "handle to deleted PolarCompassPlot"clearvars -except Radius_list Six_plots

Circle_num = 4

nlist = 1;
%Six_plots = F_six_plots(Circle_num, Radius_list);
Six_plots;

sz = size(Six_plots,2);

Plot_num(1:sz) = compassplot(ones)
jplot = 1;

while jplot < sz
Plot_num(nlist) = compassplot(Six_plots(1:nlist));
nlist = nlist+1;
jplot = jplot+1
end
X = Plot_num
Stepping thru the while works. Plot_num(nlist) is fine
X is all "handle to deleted PolarCompassPlot" clearvars -except Radius_list Six_plots

Circle_num = 4

nlist = 1;
%Six_plots = F_six_plots(Circle_num, Radius_list);
Six_plots;

sz = size(Six_plots,2);

Plot_num(1:sz) = compassplot(ones)
jplot = 1;

while jplot < sz
Plot_num(nlist) = compassplot(Six_plots(1:nlist));
nlist = nlist+1;
jplot = jplot+1
end
X = Plot_num
Stepping thru the while works. Plot_num(nlist) is fine
X is all "handle to deleted PolarCompassPlot" plot_num MATLAB Answers — New Questions

​

Hello,
I need a code for optimal location and sizing of DG in IEEE 14 bus bar system using fuzzy logic algorithm Or ANFIS technique. My objective function is power loss reduction and voltage profile improvement with and without DG. If this code is available in MATLAB with anyone. Please share it with me on my email: naveedkhanuet@gmail.com

Thank you.Hello,
I need a code for optimal location and sizing of DG in IEEE 14 bus bar system using fuzzy logic algorithm Or ANFIS technique. My objective function is power loss reduction and voltage profile improvement with and without DG. If this code is available in MATLAB with anyone. Please share it with me on my email: naveedkhanuet@gmail.com

Thank you. Hello,
I need a code for optimal location and sizing of DG in IEEE 14 bus bar system using fuzzy logic algorithm Or ANFIS technique. My objective function is power loss reduction and voltage profile improvement with and without DG. If this code is available in MATLAB with anyone. Please share it with me on my email: naveedkhanuet@gmail.com

Thank you. dg, optimization MATLAB Answers — New Questions

​

MATLAB help states that using backticks around a variable name will have it replaced with its value when its inline in a text block.I am using the Live Editor and saving as an mlx file. Below is an image of a section of code and I want to state the altitude in a text block. An extensive search of the internet provided these methods but none of them work. The variable name is not replaced by the value. Has anyone else tried this and had it work successfully? I prefer this to a statement in the code to write a sentence, its just cleaner overall. Any suggestions. tips or known examples that work? Trying out 2025b, does not work on 2023b either. Any help greatly appreciated!
Code image:MATLAB help states that using backticks around a variable name will have it replaced with its value when its inline in a text block.I am using the Live Editor and saving as an mlx file. Below is an image of a section of code and I want to state the altitude in a text block. An extensive search of the internet provided these methods but none of them work. The variable name is not replaced by the value. Has anyone else tried this and had it work successfully? I prefer this to a statement in the code to write a sentence, its just cleaner overall. Any suggestions. tips or known examples that work? Trying out 2025b, does not work on 2023b either. Any help greatly appreciated!
Code image: MATLAB help states that using backticks around a variable name will have it replaced with its value when its inline in a text block.I am using the Live Editor and saving as an mlx file. Below is an image of a section of code and I want to state the altitude in a text block. An extensive search of the internet provided these methods but none of them work. The variable name is not replaced by the value. Has anyone else tried this and had it work successfully? I prefer this to a statement in the code to write a sentence, its just cleaner overall. Any suggestions. tips or known examples that work? Trying out 2025b, does not work on 2023b either. Any help greatly appreciated!
Code image: live editor, inline text, matlab editor, matlab MATLAB Answers — New Questions

​

Hi, I have a graph where Im plotting on the x-axis time by using tic then in a loop making measurements ‘Y’ and performing tend=toc
I dor ecord the actual date / time at the start too.

dt = datestr(now,’dd-mmm-yyyy HH-MM-SS’); %get current dateTime

Once my loop has finished an I have a plot of all the Y’s against their time of measurements (starting at 0), how can I add the "duration" onto the actual datestr, so I can have on the x-axis the actual date time.

thanks
JasonHi, I have a graph where Im plotting on the x-axis time by using tic then in a loop making measurements ‘Y’ and performing tend=toc
I dor ecord the actual date / time at the start too.

dt = datestr(now,’dd-mmm-yyyy HH-MM-SS’); %get current dateTime

Once my loop has finished an I have a plot of all the Y’s against their time of measurements (starting at 0), how can I add the "duration" onto the actual datestr, so I can have on the x-axis the actual date time.

thanks
Jason Hi, I have a graph where Im plotting on the x-axis time by using tic then in a loop making measurements ‘Y’ and performing tend=toc
I dor ecord the actual date / time at the start too.

dt = datestr(now,’dd-mmm-yyyy HH-MM-SS’); %get current dateTime

Once my loop has finished an I have a plot of all the Y’s against their time of measurements (starting at 0), how can I add the "duration" onto the actual datestr, so I can have on the x-axis the actual date time.

thanks
Jason datestr, tic, toc MATLAB Answers — New Questions

​

I am experiencing an issue with a MATLAB .mldatx file and the Data Inspector.
Initially, I saved the .mldatx file for the first time before plotting any data in the Data Inspector.
After that, I plotted the data and attempted to save the file a second time.
During this second save process, the save operation did not complete successfully because the disk was full, which caused MATLAB to throw an error. After freeing up disk space, I reopened the same .mldatx file.
However, when opening the file again, all run data under the “Archive” section is missing, including all plotted graphs. At the same time, the file size shown in the file system is unchanged from before the issue occurred.
I would like to understand:
Why the Archive data and plots disappeared even though the file size is still the same
Whether the data is corrupted or still recoverable
If there is any way to restore the lost Archive data or prevent this issue in the futureI am experiencing an issue with a MATLAB .mldatx file and the Data Inspector.
Initially, I saved the .mldatx file for the first time before plotting any data in the Data Inspector.
After that, I plotted the data and attempted to save the file a second time.
During this second save process, the save operation did not complete successfully because the disk was full, which caused MATLAB to throw an error. After freeing up disk space, I reopened the same .mldatx file.
However, when opening the file again, all run data under the “Archive” section is missing, including all plotted graphs. At the same time, the file size shown in the file system is unchanged from before the issue occurred.
I would like to understand:
Why the Archive data and plots disappeared even though the file size is still the same
Whether the data is corrupted or still recoverable
If there is any way to restore the lost Archive data or prevent this issue in the future I am experiencing an issue with a MATLAB .mldatx file and the Data Inspector.
Initially, I saved the .mldatx file for the first time before plotting any data in the Data Inspector.
After that, I plotted the data and attempted to save the file a second time.
During this second save process, the save operation did not complete successfully because the disk was full, which caused MATLAB to throw an error. After freeing up disk space, I reopened the same .mldatx file.
However, when opening the file again, all run data under the “Archive” section is missing, including all plotted graphs. At the same time, the file size shown in the file system is unchanged from before the issue occurred.
I would like to understand:
Why the Archive data and plots disappeared even though the file size is still the same
Whether the data is corrupted or still recoverable
If there is any way to restore the lost Archive data or prevent this issue in the future matlab, data inspector, .mldatx, mldatx, file corruption MATLAB Answers — New Questions

​

Hello everyone,
I am simulating a 2D–3D image registration pipeline for 6D motion estimation (3D translation + rotation) from two 2D X-ray projections, based on the following paper:
[1] Fu & Kuduvalli, “A fast, accurate, and automatic 2D–3D image registration for image-guided cranial radiosurgery,” Med. Phys., 2008.
The pipeline consists of:
Generating a 3D CT volume with known fiducials
Applying a known 6D rigid transformation to the CT
Generating two 2D projections (A and B)
Performing accurate 2D–2D registration between each X-ray and its corresponding DRR
Estimating the final 6D transformation using geometric back-projection / analytical decomposition (as described in the paper)
Problem Description
The 2D image registrations are accurate and stable (x, y, in-plane rotation, and roll are recovered correctly for both projections).
However, the final 6D estimation shows significant error, especially in:
Out-of-plane translation
Out-of-plane rotations
Because the 2D registrations behave as expected, I suspect the issue is in the geometric back-projection / 2D-to-3D decomposition step, rather than in the similarity metric or optimization.
Specifically, I am unsure whether:
My implementation of the analytical back-projection equations is correct
The projection geometry (scaling, sign conventions, coordinate frames) is consistent between the two views
Additional geometric constraints or assumptions are required for observability
What I Am Looking For
I would greatly appreciate any insights or suggestions on:
Correct implementation of 2D-to-3D geometric back-projection for dual-view registration
Common pitfalls in coordinate systems, scaling factors, or sign conventions
Whether a cone-beam vs. parallel-beam assumption materially affects the 6D solution
Any recommended validation or sanity checks for this type of pipeline
I have attached the MATLAB code below for reference.
Thank you very much for your time and support.
Reference
[1] Fu, D., & Kuduvalli, G. (2008). A fast, accurate, and automatic 2D–3D image registration for image-guided cranial radiosurgery. Medical Physics, 35(5), 2180–2194.Hello everyone,
I am simulating a 2D–3D image registration pipeline for 6D motion estimation (3D translation + rotation) from two 2D X-ray projections, based on the following paper:
[1] Fu & Kuduvalli, “A fast, accurate, and automatic 2D–3D image registration for image-guided cranial radiosurgery,” Med. Phys., 2008.
The pipeline consists of:
Generating a 3D CT volume with known fiducials
Applying a known 6D rigid transformation to the CT
Generating two 2D projections (A and B)
Performing accurate 2D–2D registration between each X-ray and its corresponding DRR
Estimating the final 6D transformation using geometric back-projection / analytical decomposition (as described in the paper)
Problem Description
The 2D image registrations are accurate and stable (x, y, in-plane rotation, and roll are recovered correctly for both projections).
However, the final 6D estimation shows significant error, especially in:
Out-of-plane translation
Out-of-plane rotations
Because the 2D registrations behave as expected, I suspect the issue is in the geometric back-projection / 2D-to-3D decomposition step, rather than in the similarity metric or optimization.
Specifically, I am unsure whether:
My implementation of the analytical back-projection equations is correct
The projection geometry (scaling, sign conventions, coordinate frames) is consistent between the two views
Additional geometric constraints or assumptions are required for observability
What I Am Looking For
I would greatly appreciate any insights or suggestions on:
Correct implementation of 2D-to-3D geometric back-projection for dual-view registration
Common pitfalls in coordinate systems, scaling factors, or sign conventions
Whether a cone-beam vs. parallel-beam assumption materially affects the 6D solution
Any recommended validation or sanity checks for this type of pipeline
I have attached the MATLAB code below for reference.
Thank you very much for your time and support.
Reference
[1] Fu, D., & Kuduvalli, G. (2008). A fast, accurate, and automatic 2D–3D image registration for image-guided cranial radiosurgery. Medical Physics, 35(5), 2180–2194. Hello everyone,
I am simulating a 2D–3D image registration pipeline for 6D motion estimation (3D translation + rotation) from two 2D X-ray projections, based on the following paper:
[1] Fu & Kuduvalli, “A fast, accurate, and automatic 2D–3D image registration for image-guided cranial radiosurgery,” Med. Phys., 2008.
The pipeline consists of:
Generating a 3D CT volume with known fiducials
Applying a known 6D rigid transformation to the CT
Generating two 2D projections (A and B)
Performing accurate 2D–2D registration between each X-ray and its corresponding DRR
Estimating the final 6D transformation using geometric back-projection / analytical decomposition (as described in the paper)
Problem Description
The 2D image registrations are accurate and stable (x, y, in-plane rotation, and roll are recovered correctly for both projections).
However, the final 6D estimation shows significant error, especially in:
Out-of-plane translation
Out-of-plane rotations
Because the 2D registrations behave as expected, I suspect the issue is in the geometric back-projection / 2D-to-3D decomposition step, rather than in the similarity metric or optimization.
Specifically, I am unsure whether:
My implementation of the analytical back-projection equations is correct
The projection geometry (scaling, sign conventions, coordinate frames) is consistent between the two views
Additional geometric constraints or assumptions are required for observability
What I Am Looking For
I would greatly appreciate any insights or suggestions on:
Correct implementation of 2D-to-3D geometric back-projection for dual-view registration
Common pitfalls in coordinate systems, scaling factors, or sign conventions
Whether a cone-beam vs. parallel-beam assumption materially affects the 6D solution
Any recommended validation or sanity checks for this type of pipeline
I have attached the MATLAB code below for reference.
Thank you very much for your time and support.
Reference
[1] Fu, D., & Kuduvalli, G. (2008). A fast, accurate, and automatic 2D–3D image registration for image-guided cranial radiosurgery. Medical Physics, 35(5), 2180–2194. registration, 2d-3d image registration, optimization, iterative joint optimization MATLAB Answers — New Questions

​