Hi all,
I’ve decided to give MATLAB a try for my research project.
I’m trying to create a 3D mesh of given coordinates E, N and elevation.
I can plot all the points using plot3(x,y,z,’.’);
Using an XLSX or csv spreadsheet for the datsets I have removed all unnecessary data such as point name and code leaving only E,N and elevation in a 460×3 table.
And using the patch function it does something but not creating the surface as I would like it as a mesh.
I would also like to set some parameters when creating the mesh i.e don’t create surface between outside points where distance between those points is greater than say 20m.
Attached is a screenshot of where I am up to.
Kind regards,

Mitch.Hi all,
I’ve decided to give MATLAB a try for my research project.
I’m trying to create a 3D mesh of given coordinates E, N and elevation.
I can plot all the points using plot3(x,y,z,’.’);
Using an XLSX or csv spreadsheet for the datsets I have removed all unnecessary data such as point name and code leaving only E,N and elevation in a 460×3 table.
And using the patch function it does something but not creating the surface as I would like it as a mesh.
I would also like to set some parameters when creating the mesh i.e don’t create surface between outside points where distance between those points is greater than say 20m.
Attached is a screenshot of where I am up to.
Kind regards,

Mitch. Hi all,
I’ve decided to give MATLAB a try for my research project.
I’m trying to create a 3D mesh of given coordinates E, N and elevation.
I can plot all the points using plot3(x,y,z,’.’);
Using an XLSX or csv spreadsheet for the datsets I have removed all unnecessary data such as point name and code leaving only E,N and elevation in a 460×3 table.
And using the patch function it does something but not creating the surface as I would like it as a mesh.
I would also like to set some parameters when creating the mesh i.e don’t create surface between outside points where distance between those points is greater than say 20m.
Attached is a screenshot of where I am up to.
Kind regards,

Mitch. mesh, surface, 3d, plot MATLAB Answers — New Questions

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Dear all, how are you?
I created the following code to simulate an anticlockwise rotating trajectory forced by an external velocity. Now, I want to calculate the area each time the trajectory makes a closed circle, as described in the attached image. I would appreciate any help in finding the best way to identify the areas inside the circles for each loop/circle in the trajectory. Thanks for your time!
clear all,close all;

Fs = 1/0.5;
duration_hours = 25 * 24;
t = 0:1/Fs:duration_hours;
period = 20;
phase = -pi/2;

num_periods = floor(duration_hours / period);
amplitudes = 0.1/2 + 0.1 * rand(1, num_periods); % Random amplitudes between 0.1 and 0.3

y = zeros(size(t));
for i = 1:num_periods
start_idx = (i-1) * period * Fs + 1;
end_idx = i * period * Fs;
uI(start_idx:end_idx) = amplitudes(i) * sin(2*pi*(t(start_idx:end_idx) – t(start_idx))/period);
end

amplitudes = 0.1/2 + 0.1 * rand(1, num_periods); % Random amplitudes between 0.1 and 0.3
for i = 1:num_periods
start_idx = (i-1) * period * Fs + 1;
end_idx = i * period * Fs;
vI(start_idx:end_idx) = amplitudes(i) * sin(2*pi*(t(start_idx:end_idx) – t(start_idx))/period);
end

uI = uI(10:end);
vI = vI(1:length(uI));

cv = complex(uI*100,vI*100);
dt=0.5/24;
dt=dt*3600*24;
cxI=cumsum(cv)*dt;
cxI=cxI/100/1000;

x = real(cxI + complex(cumsum(repmat(0.1,1191,1)),0)’ );
y = imag(cxI + complex(cumsum(repmat(0.1,1191,1)),0)’ );
clearvars -except x y;
plot(x,y),axis equal;Dear all, how are you?
I created the following code to simulate an anticlockwise rotating trajectory forced by an external velocity. Now, I want to calculate the area each time the trajectory makes a closed circle, as described in the attached image. I would appreciate any help in finding the best way to identify the areas inside the circles for each loop/circle in the trajectory. Thanks for your time!
clear all,close all;

Fs = 1/0.5;
duration_hours = 25 * 24;
t = 0:1/Fs:duration_hours;
period = 20;
phase = -pi/2;

num_periods = floor(duration_hours / period);
amplitudes = 0.1/2 + 0.1 * rand(1, num_periods); % Random amplitudes between 0.1 and 0.3

y = zeros(size(t));
for i = 1:num_periods
start_idx = (i-1) * period * Fs + 1;
end_idx = i * period * Fs;
uI(start_idx:end_idx) = amplitudes(i) * sin(2*pi*(t(start_idx:end_idx) – t(start_idx))/period);
end

amplitudes = 0.1/2 + 0.1 * rand(1, num_periods); % Random amplitudes between 0.1 and 0.3
for i = 1:num_periods
start_idx = (i-1) * period * Fs + 1;
end_idx = i * period * Fs;
vI(start_idx:end_idx) = amplitudes(i) * sin(2*pi*(t(start_idx:end_idx) – t(start_idx))/period);
end

uI = uI(10:end);
vI = vI(1:length(uI));

cv = complex(uI*100,vI*100);
dt=0.5/24;
dt=dt*3600*24;
cxI=cumsum(cv)*dt;
cxI=cxI/100/1000;

x = real(cxI + complex(cumsum(repmat(0.1,1191,1)),0)’ );
y = imag(cxI + complex(cumsum(repmat(0.1,1191,1)),0)’ );
clearvars -except x y;
plot(x,y),axis equal; Dear all, how are you?
I created the following code to simulate an anticlockwise rotating trajectory forced by an external velocity. Now, I want to calculate the area each time the trajectory makes a closed circle, as described in the attached image. I would appreciate any help in finding the best way to identify the areas inside the circles for each loop/circle in the trajectory. Thanks for your time!
clear all,close all;

Fs = 1/0.5;
duration_hours = 25 * 24;
t = 0:1/Fs:duration_hours;
period = 20;
phase = -pi/2;

num_periods = floor(duration_hours / period);
amplitudes = 0.1/2 + 0.1 * rand(1, num_periods); % Random amplitudes between 0.1 and 0.3

y = zeros(size(t));
for i = 1:num_periods
start_idx = (i-1) * period * Fs + 1;
end_idx = i * period * Fs;
uI(start_idx:end_idx) = amplitudes(i) * sin(2*pi*(t(start_idx:end_idx) – t(start_idx))/period);
end

amplitudes = 0.1/2 + 0.1 * rand(1, num_periods); % Random amplitudes between 0.1 and 0.3
for i = 1:num_periods
start_idx = (i-1) * period * Fs + 1;
end_idx = i * period * Fs;
vI(start_idx:end_idx) = amplitudes(i) * sin(2*pi*(t(start_idx:end_idx) – t(start_idx))/period);
end

uI = uI(10:end);
vI = vI(1:length(uI));

cv = complex(uI*100,vI*100);
dt=0.5/24;
dt=dt*3600*24;
cxI=cumsum(cv)*dt;
cxI=cxI/100/1000;

x = real(cxI + complex(cumsum(repmat(0.1,1191,1)),0)’ );
y = imag(cxI + complex(cumsum(repmat(0.1,1191,1)),0)’ );
clearvars -except x y;
plot(x,y),axis equal; matlab, time series MATLAB Answers — New Questions

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Hello all,
I am working on MATLAB ray tracing tool for visible light communication. But the "txsite" command takes maximum "Transmitter Frequency" of 2e11 and starting frequency of visible light is 4.62e14. Please provide a solution to this problem.Hello all,
I am working on MATLAB ray tracing tool for visible light communication. But the "txsite" command takes maximum "Transmitter Frequency" of 2e11 and starting frequency of visible light is 4.62e14. Please provide a solution to this problem. Hello all,
I am working on MATLAB ray tracing tool for visible light communication. But the "txsite" command takes maximum "Transmitter Frequency" of 2e11 and starting frequency of visible light is 4.62e14. Please provide a solution to this problem. visiblelight MATLAB Answers — New Questions

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I’m wondering whether it is possible to create a expert system( Not fuzzy logic ) based on matlab?. Thanks in advanceI’m wondering whether it is possible to create a expert system( Not fuzzy logic ) based on matlab?. Thanks in advance I’m wondering whether it is possible to create a expert system( Not fuzzy logic ) based on matlab?. Thanks in advance expert system MATLAB Answers — New Questions

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I am using lsqnonlin() with Simulink as it is used here. I am getting the errors:
Unable to perform assignment because the size of the left side is 30012-by-1 and the size of the right side is 30018-by-1
Error in finitedifferences
Error in computeFinDiffGradAndJac
Here is my code:
function [f] = trackq
% Computes f using lsqnonlin.

mdl = ‘armDynamics’;
open_system(mdl) % Load the model
in = Simulink.SimulationInput(mdl); % Create simulation input object

in = in.setModelParameter(‘StopTime’,’100′); % Stop time 100

f0 = 1; % Initial f
%
options = optimoptions(@lsqnonlin, ‘Algorithm’, ‘levenberg-marquardt’,…
‘Display’,’off’,’StepTolerance’,0.001,’OptimalityTolerance’,0.001);

% Optimize f
set_param(mdl,’FastRestart’,’on’); % Fast restart

% f = lsqnonlin(@compute_error, f0, [], [], options);
f = lsqnonlin(@compute_error, f0, [], [], options);

set_param(mdl,’FastRestart’,’off’);

function error = compute_error(f)

% Set the simulation input object parameters
in = in.setVariable(‘f’, f, ‘Workspace’, mdl);

% Simulate
out = sim(in);

% get q from the actual space arm
armCoords = out.qArm.signals.values;
armCoords = armCoords(2:4);
armCoords = armCoords’;

% get q from modelled space arm
qsim = out.get(‘yout’);
qsim = qsim.getElement(1);
qsim = qsim.Values;
qsim = qsim.Data;
qsim = qsim’;

error = armCoords – qsim;

end
endI am using lsqnonlin() with Simulink as it is used here. I am getting the errors:
Unable to perform assignment because the size of the left side is 30012-by-1 and the size of the right side is 30018-by-1
Error in finitedifferences
Error in computeFinDiffGradAndJac
Here is my code:
function [f] = trackq
% Computes f using lsqnonlin.

mdl = ‘armDynamics’;
open_system(mdl) % Load the model
in = Simulink.SimulationInput(mdl); % Create simulation input object

in = in.setModelParameter(‘StopTime’,’100′); % Stop time 100

f0 = 1; % Initial f
%
options = optimoptions(@lsqnonlin, ‘Algorithm’, ‘levenberg-marquardt’,…
‘Display’,’off’,’StepTolerance’,0.001,’OptimalityTolerance’,0.001);

% Optimize f
set_param(mdl,’FastRestart’,’on’); % Fast restart

% f = lsqnonlin(@compute_error, f0, [], [], options);
f = lsqnonlin(@compute_error, f0, [], [], options);

set_param(mdl,’FastRestart’,’off’);

function error = compute_error(f)

% Set the simulation input object parameters
in = in.setVariable(‘f’, f, ‘Workspace’, mdl);

% Simulate
out = sim(in);

% get q from the actual space arm
armCoords = out.qArm.signals.values;
armCoords = armCoords(2:4);
armCoords = armCoords’;

% get q from modelled space arm
qsim = out.get(‘yout’);
qsim = qsim.getElement(1);
qsim = qsim.Values;
qsim = qsim.Data;
qsim = qsim’;

error = armCoords – qsim;

end
end I am using lsqnonlin() with Simulink as it is used here. I am getting the errors:
Unable to perform assignment because the size of the left side is 30012-by-1 and the size of the right side is 30018-by-1
Error in finitedifferences
Error in computeFinDiffGradAndJac
Here is my code:
function [f] = trackq
% Computes f using lsqnonlin.

mdl = ‘armDynamics’;
open_system(mdl) % Load the model
in = Simulink.SimulationInput(mdl); % Create simulation input object

in = in.setModelParameter(‘StopTime’,’100′); % Stop time 100

f0 = 1; % Initial f
%
options = optimoptions(@lsqnonlin, ‘Algorithm’, ‘levenberg-marquardt’,…
‘Display’,’off’,’StepTolerance’,0.001,’OptimalityTolerance’,0.001);

% Optimize f
set_param(mdl,’FastRestart’,’on’); % Fast restart

% f = lsqnonlin(@compute_error, f0, [], [], options);
f = lsqnonlin(@compute_error, f0, [], [], options);

set_param(mdl,’FastRestart’,’off’);

function error = compute_error(f)

% Set the simulation input object parameters
in = in.setVariable(‘f’, f, ‘Workspace’, mdl);

% Simulate
out = sim(in);

% get q from the actual space arm
armCoords = out.qArm.signals.values;
armCoords = armCoords(2:4);
armCoords = armCoords’;

% get q from modelled space arm
qsim = out.get(‘yout’);
qsim = qsim.getElement(1);
qsim = qsim.Values;
qsim = qsim.Data;
qsim = qsim’;

error = armCoords – qsim;

end
end lsqnonlin MATLAB Answers — New Questions

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I’m trying to build a model in Linux environment. But it throws error as unable to open source file. This error is for a custom header file, which is verified to be present in the path (not current path).
I have tried to build the same model in Windows environment, where is builds without any issues.
Does anyone have solution to this problem? Thanks in advance.
P.S. I’m using MATLAB R2022b.I’m trying to build a model in Linux environment. But it throws error as unable to open source file. This error is for a custom header file, which is verified to be present in the path (not current path).
I have tried to build the same model in Windows environment, where is builds without any issues.
Does anyone have solution to this problem? Thanks in advance.
P.S. I’m using MATLAB R2022b. I’m trying to build a model in Linux environment. But it throws error as unable to open source file. This error is for a custom header file, which is verified to be present in the path (not current path).
I have tried to build the same model in Windows environment, where is builds without any issues.
Does anyone have solution to this problem? Thanks in advance.
P.S. I’m using MATLAB R2022b. linux, custom file MATLAB Answers — New Questions

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Hello everyone,
MATLAB never misses on destroying any confidence you have in you coding skills.
I am coding a relatively easy script for data analysis, where I would plot data with a legend. In the code, I loop a plot() function to stack lines and then I ask to display a legend. However, I get the classic error from MATLAB:
Warning: Ignoring extra legend entries.
> In legend>process_inputs (line 590)
In legend>make_legend (line 319)
In legend (line 263)
Without dumping here the entire code, which is redundant, I get the same warning in an analogous and much simpler case:
figure;
x = 1:10;
y = randn(5, 10);
Labs = ["1", "2", "3", "4", "5"];
for i = 1:5
plot(x, y(i,:)); hold on
end
legend(Labs)
The result is 5 lines in the plot, but MATLAB throws the warning above, displaying an empty legend in the figure.
If I try instead the "DislayName" method, the warning disappears, but the legend doesn’t even show up.
figure;
x = 1:10;
y = randn(5, 10);
Labs = ["1", "2", "3", "4", "5"];
for i = 1:5
plot(x, y(i,:), "DisplayName", Labs{i}); hold on
end
legend
Can someone please help make sense of this? Thank you very much in advance.Hello everyone,
MATLAB never misses on destroying any confidence you have in you coding skills.
I am coding a relatively easy script for data analysis, where I would plot data with a legend. In the code, I loop a plot() function to stack lines and then I ask to display a legend. However, I get the classic error from MATLAB:
Warning: Ignoring extra legend entries.
> In legend>process_inputs (line 590)
In legend>make_legend (line 319)
In legend (line 263)
Without dumping here the entire code, which is redundant, I get the same warning in an analogous and much simpler case:
figure;
x = 1:10;
y = randn(5, 10);
Labs = ["1", "2", "3", "4", "5"];
for i = 1:5
plot(x, y(i,:)); hold on
end
legend(Labs)
The result is 5 lines in the plot, but MATLAB throws the warning above, displaying an empty legend in the figure.
If I try instead the "DislayName" method, the warning disappears, but the legend doesn’t even show up.
figure;
x = 1:10;
y = randn(5, 10);
Labs = ["1", "2", "3", "4", "5"];
for i = 1:5
plot(x, y(i,:), "DisplayName", Labs{i}); hold on
end
legend
Can someone please help make sense of this? Thank you very much in advance. Hello everyone,
MATLAB never misses on destroying any confidence you have in you coding skills.
I am coding a relatively easy script for data analysis, where I would plot data with a legend. In the code, I loop a plot() function to stack lines and then I ask to display a legend. However, I get the classic error from MATLAB:
Warning: Ignoring extra legend entries.
> In legend>process_inputs (line 590)
In legend>make_legend (line 319)
In legend (line 263)
Without dumping here the entire code, which is redundant, I get the same warning in an analogous and much simpler case:
figure;
x = 1:10;
y = randn(5, 10);
Labs = ["1", "2", "3", "4", "5"];
for i = 1:5
plot(x, y(i,:)); hold on
end
legend(Labs)
The result is 5 lines in the plot, but MATLAB throws the warning above, displaying an empty legend in the figure.
If I try instead the "DislayName" method, the warning disappears, but the legend doesn’t even show up.
figure;
x = 1:10;
y = randn(5, 10);
Labs = ["1", "2", "3", "4", "5"];
for i = 1:5
plot(x, y(i,:), "DisplayName", Labs{i}); hold on
end
legend
Can someone please help make sense of this? Thank you very much in advance. legend, plot, loop MATLAB Answers — New Questions

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When I type:
>> syms x y
>> solve(y-x^2,x)
I get:
ans =
[ 1/2 ]
[y ]
[ ]
[ 1/2]
[-y ]
How do I change the output format so to get MATLAB code (with * and ^), which by the way is what I used to get (before today)?When I type:
>> syms x y
>> solve(y-x^2,x)
I get:
ans =
[ 1/2 ]
[y ]
[ ]
[ 1/2]
[-y ]
How do I change the output format so to get MATLAB code (with * and ^), which by the way is what I used to get (before today)? When I type:
>> syms x y
>> solve(y-x^2,x)
I get:
ans =
[ 1/2 ]
[y ]
[ ]
[ 1/2]
[-y ]
How do I change the output format so to get MATLAB code (with * and ^), which by the way is what I used to get (before today)? output format MATLAB Answers — New Questions

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Matlab code for Optimization of Distributed GenerationMatlab code for Optimization of Distributed Generation Matlab code for Optimization of Distributed Generation code, graph MATLAB Answers — New Questions

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안녕하세요.

AUTOSAR Application SWC 를 MBD 로 구현하고자 하는데 state 내에서의 server runnable 호출을 하려면 어떻게 해야 하는지요?
state 내에 단순히 함수명을 이용한 호출을 시도하면 아래와 같은 오류가 발생합니다.

"AUTOSAR operation ‘AuxH_SnsrRlyCtrl_SetMode’ requires changes to the Simulink Function prototype that cannot be applied to ‘StateHandler/R_StateHandler_10ms_sys/IFCU_State’. For AUTOSAR targets, changes to the Simulink Function prototype are only supported for ‘Simulink Function’ or ‘Function Caller’ blocks in the top model."

특정 state 에서만 server runnable 을 호출하고자 할 때 어떤 방법을 사용하면 되는지 가이드 부탁 드립니다.

감사합니다.안녕하세요.

AUTOSAR Application SWC 를 MBD 로 구현하고자 하는데 state 내에서의 server runnable 호출을 하려면 어떻게 해야 하는지요?
state 내에 단순히 함수명을 이용한 호출을 시도하면 아래와 같은 오류가 발생합니다.

"AUTOSAR operation ‘AuxH_SnsrRlyCtrl_SetMode’ requires changes to the Simulink Function prototype that cannot be applied to ‘StateHandler/R_StateHandler_10ms_sys/IFCU_State’. For AUTOSAR targets, changes to the Simulink Function prototype are only supported for ‘Simulink Function’ or ‘Function Caller’ blocks in the top model."

특정 state 에서만 server runnable 을 호출하고자 할 때 어떤 방법을 사용하면 되는지 가이드 부탁 드립니다.

감사합니다. 안녕하세요.

AUTOSAR Application SWC 를 MBD 로 구현하고자 하는데 state 내에서의 server runnable 호출을 하려면 어떻게 해야 하는지요?
state 내에 단순히 함수명을 이용한 호출을 시도하면 아래와 같은 오류가 발생합니다.

"AUTOSAR operation ‘AuxH_SnsrRlyCtrl_SetMode’ requires changes to the Simulink Function prototype that cannot be applied to ‘StateHandler/R_StateHandler_10ms_sys/IFCU_State’. For AUTOSAR targets, changes to the Simulink Function prototype are only supported for ‘Simulink Function’ or ‘Function Caller’ blocks in the top model."

특정 state 에서만 server runnable 을 호출하고자 할 때 어떤 방법을 사용하면 되는지 가이드 부탁 드립니다.

감사합니다. autosar, stateflow MATLAB Answers — New Questions

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