Hi. I’m trying to create a PIL connectivity configuration for a board with a Cortex-M3 processor, using the "modern" method of target package and CMake. The code that is being generated is PIC, and I need it to not be PIC because I really do not want to write a bootloader. I simply want to run a PIL simulation and confirm that everything is calculated correctly. Handling a PIE is wasted effort.
However, I cannot see any way to disable PIC. In the internal files of the coder toolbox, file "writeCMakeLists.m" which generates the CMakeLists.txt from what I can see, the following is written:
% Always compile using position independent code
% Static libraries built without PIC might cause a failure when linked by a shared library
% See g2329017

cmakeTarget.Properties(end+1) = coder.make.internal.cmake.NameValuePair(‘PREFIX’, ‘""’);
cmakeTarget.Properties(end+1) = coder.make.internal.cmake.NameValuePair(‘POSITION_INDEPENDENT_CODE’, ‘ON’);
So from that I take that PIC is forced on the generated code. I would like to know if there is any way to disable PIC, or, as a last resort, if modifying the above Matlab file to disable PIC would have any unintended consequences (this is a bit complicated since I don’t have admin at work to modify program files, but as a last resort can be done).
Thank you.Hi. I’m trying to create a PIL connectivity configuration for a board with a Cortex-M3 processor, using the "modern" method of target package and CMake. The code that is being generated is PIC, and I need it to not be PIC because I really do not want to write a bootloader. I simply want to run a PIL simulation and confirm that everything is calculated correctly. Handling a PIE is wasted effort.
However, I cannot see any way to disable PIC. In the internal files of the coder toolbox, file "writeCMakeLists.m" which generates the CMakeLists.txt from what I can see, the following is written:
% Always compile using position independent code
% Static libraries built without PIC might cause a failure when linked by a shared library
% See g2329017

cmakeTarget.Properties(end+1) = coder.make.internal.cmake.NameValuePair(‘PREFIX’, ‘""’);
cmakeTarget.Properties(end+1) = coder.make.internal.cmake.NameValuePair(‘POSITION_INDEPENDENT_CODE’, ‘ON’);
So from that I take that PIC is forced on the generated code. I would like to know if there is any way to disable PIC, or, as a last resort, if modifying the above Matlab file to disable PIC would have any unintended consequences (this is a bit complicated since I don’t have admin at work to modify program files, but as a last resort can be done).
Thank you. Hi. I’m trying to create a PIL connectivity configuration for a board with a Cortex-M3 processor, using the "modern" method of target package and CMake. The code that is being generated is PIC, and I need it to not be PIC because I really do not want to write a bootloader. I simply want to run a PIL simulation and confirm that everything is calculated correctly. Handling a PIE is wasted effort.
However, I cannot see any way to disable PIC. In the internal files of the coder toolbox, file "writeCMakeLists.m" which generates the CMakeLists.txt from what I can see, the following is written:
% Always compile using position independent code
% Static libraries built without PIC might cause a failure when linked by a shared library
% See g2329017

cmakeTarget.Properties(end+1) = coder.make.internal.cmake.NameValuePair(‘PREFIX’, ‘""’);
cmakeTarget.Properties(end+1) = coder.make.internal.cmake.NameValuePair(‘POSITION_INDEPENDENT_CODE’, ‘ON’);
So from that I take that PIC is forced on the generated code. I would like to know if there is any way to disable PIC, or, as a last resort, if modifying the above Matlab file to disable PIC would have any unintended consequences (this is a bit complicated since I don’t have admin at work to modify program files, but as a last resort can be done).
Thank you. code generation, pil, cmake MATLAB Answers — New Questions

​

I am working on developing an application in app designer for doing a bunch of fits and saving the results in an array of structures, where each structure has various types of fields about the fit results. When I save the file, I update the array with the fit_info structure each fit, and append to the array of structures for each save step. I eventually will be doing 89×13 fits. But, each cycle gets slower and slower, so it is impractically slow by about 30 fits. I looked into saving a separate variable for each fit, by dynamically naming the variables, i.e., fit_info_1_1, fit_info_1_2, etc., but I know this is bad programming practice. Does anyone have any suggestions?
function SaveFitButtonPushed(app, event)
data_source=string(app.TextArea.Value);
filename=strcat("fit_results_",data_source);
if isfile(filename)
matObj=matfile(filename,’Writable’,true);
matObj.fit_info_a(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_1;
else
fit_info_a(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_1;
save (filename,’fit_info_a’,’-v7.3′);
end
if ~isempty(app.fit_info_2.pm95)
data_source=string(app.TextArea.Value);
filename=strcat("fit_results_2_",data_source);
if isfile(filename)
matObj=matfile(filename,’Writable’,true);
matObj.fit_info_b(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_2;
else
fit_info_b(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_2;
save (filename,’fit_info_b’,’-v7.3′);
end
end
app.k_refS_1refS_2refTextArea.Value=”;
app.s_ETextArea.Value=”;
app.k_refS_1refS_2refTextArea_2.Value=”;
app.s_ETextArea_2.Value=”;
app.phi_refEditField.Value=30;
app.phi_refEditField_2.Value=30;
str='[]’;
app.OmitPointsEditField.Value=str;
app.OmitPointsEditField_2.Value=str;
endI am working on developing an application in app designer for doing a bunch of fits and saving the results in an array of structures, where each structure has various types of fields about the fit results. When I save the file, I update the array with the fit_info structure each fit, and append to the array of structures for each save step. I eventually will be doing 89×13 fits. But, each cycle gets slower and slower, so it is impractically slow by about 30 fits. I looked into saving a separate variable for each fit, by dynamically naming the variables, i.e., fit_info_1_1, fit_info_1_2, etc., but I know this is bad programming practice. Does anyone have any suggestions?
function SaveFitButtonPushed(app, event)
data_source=string(app.TextArea.Value);
filename=strcat("fit_results_",data_source);
if isfile(filename)
matObj=matfile(filename,’Writable’,true);
matObj.fit_info_a(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_1;
else
fit_info_a(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_1;
save (filename,’fit_info_a’,’-v7.3′);
end
if ~isempty(app.fit_info_2.pm95)
data_source=string(app.TextArea.Value);
filename=strcat("fit_results_2_",data_source);
if isfile(filename)
matObj=matfile(filename,’Writable’,true);
matObj.fit_info_b(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_2;
else
fit_info_b(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_2;
save (filename,’fit_info_b’,’-v7.3′);
end
end
app.k_refS_1refS_2refTextArea.Value=”;
app.s_ETextArea.Value=”;
app.k_refS_1refS_2refTextArea_2.Value=”;
app.s_ETextArea_2.Value=”;
app.phi_refEditField.Value=30;
app.phi_refEditField_2.Value=30;
str='[]’;
app.OmitPointsEditField.Value=str;
app.OmitPointsEditField_2.Value=str;
end I am working on developing an application in app designer for doing a bunch of fits and saving the results in an array of structures, where each structure has various types of fields about the fit results. When I save the file, I update the array with the fit_info structure each fit, and append to the array of structures for each save step. I eventually will be doing 89×13 fits. But, each cycle gets slower and slower, so it is impractically slow by about 30 fits. I looked into saving a separate variable for each fit, by dynamically naming the variables, i.e., fit_info_1_1, fit_info_1_2, etc., but I know this is bad programming practice. Does anyone have any suggestions?
function SaveFitButtonPushed(app, event)
data_source=string(app.TextArea.Value);
filename=strcat("fit_results_",data_source);
if isfile(filename)
matObj=matfile(filename,’Writable’,true);
matObj.fit_info_a(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_1;
else
fit_info_a(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_1;
save (filename,’fit_info_a’,’-v7.3′);
end
if ~isempty(app.fit_info_2.pm95)
data_source=string(app.TextArea.Value);
filename=strcat("fit_results_2_",data_source);
if isfile(filename)
matObj=matfile(filename,’Writable’,true);
matObj.fit_info_b(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_2;
else
fit_info_b(app.ColumnEditField.Value,app.CompoundEditField.Value)=app.fit_info_2;
save (filename,’fit_info_b’,’-v7.3′);
end
end
app.k_refS_1refS_2refTextArea.Value=”;
app.s_ETextArea.Value=”;
app.k_refS_1refS_2refTextArea_2.Value=”;
app.s_ETextArea_2.Value=”;
app.phi_refEditField.Value=30;
app.phi_refEditField_2.Value=30;
str='[]’;
app.OmitPointsEditField.Value=str;
app.OmitPointsEditField_2.Value=str;
end appdesigner, save, appending to file, array of structures MATLAB Answers — New Questions

​

Guys:

I´m an electric engineering student and I´m trying to create a IEEE-33 distribuion line topology with simulink as shown in figure 1. Source voltage is 138Kv and transformer reduces to 13.8 Kv.

<</matlabcentral/answers/uploaded_files/27736/topology.png>>

Instead of using fixed loads, I´m using three phase dynamic load with external control as show in figure 2.

<</matlabcentral/answers/uploaded_files/27737/model.png>>

I´m facing a problem with with a very small model with three loads. Voltages and currents that are associated to these load models as show in figure 3 have strange behaviours. Results are like numeric noise. I was suspecting that the problem could be related with solve model but I tried fixed step and variable step with the same results.

<</matlabcentral/answers/uploaded_files/27738/results.png>>

Can anyone explain to me what is going on with the model and how to fix it ?

Sincerely,
Andre NudelGuys:

I´m an electric engineering student and I´m trying to create a IEEE-33 distribuion line topology with simulink as shown in figure 1. Source voltage is 138Kv and transformer reduces to 13.8 Kv.

<</matlabcentral/answers/uploaded_files/27736/topology.png>>

Instead of using fixed loads, I´m using three phase dynamic load with external control as show in figure 2.

<</matlabcentral/answers/uploaded_files/27737/model.png>>

I´m facing a problem with with a very small model with three loads. Voltages and currents that are associated to these load models as show in figure 3 have strange behaviours. Results are like numeric noise. I was suspecting that the problem could be related with solve model but I tried fixed step and variable step with the same results.

<</matlabcentral/answers/uploaded_files/27738/results.png>>

Can anyone explain to me what is going on with the model and how to fix it ?

Sincerely,
Andre Nudel Guys:

I´m an electric engineering student and I´m trying to create a IEEE-33 distribuion line topology with simulink as shown in figure 1. Source voltage is 138Kv and transformer reduces to 13.8 Kv.

<</matlabcentral/answers/uploaded_files/27736/topology.png>>

Instead of using fixed loads, I´m using three phase dynamic load with external control as show in figure 2.

<</matlabcentral/answers/uploaded_files/27737/model.png>>

I´m facing a problem with with a very small model with three loads. Voltages and currents that are associated to these load models as show in figure 3 have strange behaviours. Results are like numeric noise. I was suspecting that the problem could be related with solve model but I tried fixed step and variable step with the same results.

<</matlabcentral/answers/uploaded_files/27738/results.png>>

Can anyone explain to me what is going on with the model and how to fix it ?

Sincerely,
Andre Nudel threephasedynamicload MATLAB Answers — New Questions

​

How can I retrieve the incremental regression kernel trained model?: the equation that predict function uses to predict output.How can I retrieve the incremental regression kernel trained model?: the equation that predict function uses to predict output. How can I retrieve the incremental regression kernel trained model?: the equation that predict function uses to predict output. regression, svm, random features expansion MATLAB Answers — New Questions

​

Dear all,
I work on MATLAB R2023a and Windows 11 23H2.
Thanks to this post I coud do the following code which disconnect safely E:, a USB drive.
Unfortunately, sometimes it does not work, for example, when I change the plug from USB port, it needs several execution to disconnect safely the drive.
I also noticed that in the app (see below), missing run are more frequent. The code is just executed under the button Run (first callback).
The command window shows the message I expect when it works but in fact the USB drive is still visible on "My Computer". If the disconnection works, I see an error message in the command window.
Do you have an idea what can I do to solve this issue or find it origin?
Best regards,
Pierre
The code:
function EjectUSB
% Create the PowerShell command to eject the drive
powershellCommand = ‘(New-Object -comObject Shell.Application).Namespace(17).ParseName(”E:”).InvokeVerb(”Eject”)’;

% Create the command to run PowerShell from MATLAB
command = sprintf(‘powershell -Command "%s"’, powershellCommand);

% Execute the PowerShell command
[status, cmdout] = system(command);

% Display the results
if status == 0
disp([‘Lecteur USB E éjecté avec succès.’]);
else
disp(‘Échec de l”éjection du lecteur USB.’);
disp(cmdout);
end
end

%Add a diskpart list to check if E: has been removed
The app:
classdef PotVibrantUI < matlab.apps.AppBase

% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
AmplitudeSlider matlab.ui.control.Slider
FrequencySlider matlab.ui.control.Slider
Amplitude0to1EditField matlab.ui.control.NumericEditField
Amplitude0to1EditFieldLabel matlab.ui.control.Label
FrequencyHzEditField matlab.ui.control.NumericEditField
FrequencyHzEditFieldLabel matlab.ui.control.Label
RunButton matlab.ui.control.Button
end

properties (Access = private)
frequency = 20; % Default frequency value
amplitude = 0.5; % Default amplitude value
end

% Callbacks that handle component events
methods (Access = private)

% Button pushed function: RunButton
function RunButtonPushed(app, event)
SetupFileCreation(app.frequency)
CustomFileCreation(app.amplitude)
pause(3)
EjectUSB
pause(3)
EjectUSB
end

% Value changing function: FrequencySlider
function FrequencySliderValueChanging(app, event)
changingValue = event.Value;
app.FrequencyHzEditField.Value = changingValue;
% Update the app.frequency property
app.frequency = changingValue;
% guidata() to share variables
end

% Value changed function: FrequencyHzEditField
function FrequencyHzEditFieldValueChanged(app, event)
value = app.FrequencyHzEditField.Value;
app.FrequencySlider.Value = value;
% Update the app.frequency property
app.frequency = value;
end

% Value changing function: AmplitudeSlider
function AmplitudeSliderValueChanging(app, event)
changingValue = event.Value;
app.Amplitude0to1EditField.Value = changingValue;
% Update the app.frequency property
app.amplitude = changingValue;
% guidata() to share variables
end

% Value changed function: Amplitude0to1EditField
function Amplitude0to1EditFieldValueChanged(app, event)
value = app.Amplitude0to1EditField.Value;
app.AmplitudeSlider.Value = value;
app.amplitude = value;
end
end

% Component initialization
methods (Access = private)

% Create UIFigure and components
function createComponents(app)

% Create UIFigure and hide until all components are created
app.UIFigure = uifigure(‘Visible’, ‘off’);
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = ‘MATLAB App’;

% Create RunButton
app.RunButton = uibutton(app.UIFigure, ‘push’);
app.RunButton.ButtonPushedFcn = createCallbackFcn(app, @RunButtonPushed, true);
app.RunButton.FontSize = 24;
app.RunButton.Position = [26 41 568 80];
app.RunButton.Text = ‘Run’;

% Create FrequencyHzEditFieldLabel
app.FrequencyHzEditFieldLabel = uilabel(app.UIFigure);
app.FrequencyHzEditFieldLabel.HorizontalAlignment = ‘right’;
app.FrequencyHzEditFieldLabel.FontSize = 24;
app.FrequencyHzEditFieldLabel.Position = [49 435 170 31];
app.FrequencyHzEditFieldLabel.Text = ‘Frequency (Hz)’;

% Create FrequencyHzEditField
app.FrequencyHzEditField = uieditfield(app.UIFigure, ‘numeric’);
app.FrequencyHzEditField.ValueChangedFcn = createCallbackFcn(app, @FrequencyHzEditFieldValueChanged, true);
app.FrequencyHzEditField.FontSize = 24;
app.FrequencyHzEditField.Position = [234 434 100 32];
app.FrequencyHzEditField.Value = 20;

% Create Amplitude0to1EditFieldLabel
app.Amplitude0to1EditFieldLabel = uilabel(app.UIFigure);
app.Amplitude0to1EditFieldLabel.HorizontalAlignment = ‘right’;
app.Amplitude0to1EditFieldLabel.FontSize = 24;
app.Amplitude0to1EditFieldLabel.Position = [38 252 195 31];
app.Amplitude0to1EditFieldLabel.Text = ‘Amplitude (0 to 1)’;

% Create Amplitude0to1EditField
app.Amplitude0to1EditField = uieditfield(app.UIFigure, ‘numeric’);
app.Amplitude0to1EditField.ValueChangedFcn = createCallbackFcn(app, @Amplitude0to1EditFieldValueChanged, true);
app.Amplitude0to1EditField.FontSize = 24;
app.Amplitude0to1EditField.Position = [248 251 100 32];
app.Amplitude0to1EditField.Value = 0.5;

% Create FrequencySlider
app.FrequencySlider = uislider(app.UIFigure);
app.FrequencySlider.Limits = [10 40];
app.FrequencySlider.ValueChangingFcn = createCallbackFcn(app, @FrequencySliderValueChanging, true);
app.FrequencySlider.FontSize = 24;
app.FrequencySlider.Position = [26 418 473 3];
app.FrequencySlider.Value = 20;

% Create AmplitudeSlider
app.AmplitudeSlider = uislider(app.UIFigure);
app.AmplitudeSlider.Limits = [0 1];
app.AmplitudeSlider.MajorTicks = [0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1];
app.AmplitudeSlider.ValueChangingFcn = createCallbackFcn(app, @AmplitudeSliderValueChanging, true);
app.AmplitudeSlider.FontSize = 18;
app.AmplitudeSlider.Position = [20 207 479 3];
app.AmplitudeSlider.Value = 0.5;

% Show the figure after all components are created
app.UIFigure.Visible = ‘on’;
end
end

% App creation and deletion
methods (Access = public)

% Construct app
function app = PotVibrantUI

% Create UIFigure and components
createComponents(app)

% Register the app with App Designer
registerApp(app, app.UIFigure)

if nargout == 0
clear app
end
end

% Code that executes before app deletion
function delete(app)

% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
endDear all,
I work on MATLAB R2023a and Windows 11 23H2.
Thanks to this post I coud do the following code which disconnect safely E:, a USB drive.
Unfortunately, sometimes it does not work, for example, when I change the plug from USB port, it needs several execution to disconnect safely the drive.
I also noticed that in the app (see below), missing run are more frequent. The code is just executed under the button Run (first callback).
The command window shows the message I expect when it works but in fact the USB drive is still visible on "My Computer". If the disconnection works, I see an error message in the command window.
Do you have an idea what can I do to solve this issue or find it origin?
Best regards,
Pierre
The code:
function EjectUSB
% Create the PowerShell command to eject the drive
powershellCommand = ‘(New-Object -comObject Shell.Application).Namespace(17).ParseName(”E:”).InvokeVerb(”Eject”)’;

% Create the command to run PowerShell from MATLAB
command = sprintf(‘powershell -Command "%s"’, powershellCommand);

% Execute the PowerShell command
[status, cmdout] = system(command);

% Display the results
if status == 0
disp([‘Lecteur USB E éjecté avec succès.’]);
else
disp(‘Échec de l”éjection du lecteur USB.’);
disp(cmdout);
end
end

%Add a diskpart list to check if E: has been removed
The app:
classdef PotVibrantUI < matlab.apps.AppBase

% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
AmplitudeSlider matlab.ui.control.Slider
FrequencySlider matlab.ui.control.Slider
Amplitude0to1EditField matlab.ui.control.NumericEditField
Amplitude0to1EditFieldLabel matlab.ui.control.Label
FrequencyHzEditField matlab.ui.control.NumericEditField
FrequencyHzEditFieldLabel matlab.ui.control.Label
RunButton matlab.ui.control.Button
end

properties (Access = private)
frequency = 20; % Default frequency value
amplitude = 0.5; % Default amplitude value
end

% Callbacks that handle component events
methods (Access = private)

% Button pushed function: RunButton
function RunButtonPushed(app, event)
SetupFileCreation(app.frequency)
CustomFileCreation(app.amplitude)
pause(3)
EjectUSB
pause(3)
EjectUSB
end

% Value changing function: FrequencySlider
function FrequencySliderValueChanging(app, event)
changingValue = event.Value;
app.FrequencyHzEditField.Value = changingValue;
% Update the app.frequency property
app.frequency = changingValue;
% guidata() to share variables
end

% Value changed function: FrequencyHzEditField
function FrequencyHzEditFieldValueChanged(app, event)
value = app.FrequencyHzEditField.Value;
app.FrequencySlider.Value = value;
% Update the app.frequency property
app.frequency = value;
end

% Value changing function: AmplitudeSlider
function AmplitudeSliderValueChanging(app, event)
changingValue = event.Value;
app.Amplitude0to1EditField.Value = changingValue;
% Update the app.frequency property
app.amplitude = changingValue;
% guidata() to share variables
end

% Value changed function: Amplitude0to1EditField
function Amplitude0to1EditFieldValueChanged(app, event)
value = app.Amplitude0to1EditField.Value;
app.AmplitudeSlider.Value = value;
app.amplitude = value;
end
end

% Component initialization
methods (Access = private)

% Create UIFigure and components
function createComponents(app)

% Create UIFigure and hide until all components are created
app.UIFigure = uifigure(‘Visible’, ‘off’);
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = ‘MATLAB App’;

% Create RunButton
app.RunButton = uibutton(app.UIFigure, ‘push’);
app.RunButton.ButtonPushedFcn = createCallbackFcn(app, @RunButtonPushed, true);
app.RunButton.FontSize = 24;
app.RunButton.Position = [26 41 568 80];
app.RunButton.Text = ‘Run’;

% Create FrequencyHzEditFieldLabel
app.FrequencyHzEditFieldLabel = uilabel(app.UIFigure);
app.FrequencyHzEditFieldLabel.HorizontalAlignment = ‘right’;
app.FrequencyHzEditFieldLabel.FontSize = 24;
app.FrequencyHzEditFieldLabel.Position = [49 435 170 31];
app.FrequencyHzEditFieldLabel.Text = ‘Frequency (Hz)’;

% Create FrequencyHzEditField
app.FrequencyHzEditField = uieditfield(app.UIFigure, ‘numeric’);
app.FrequencyHzEditField.ValueChangedFcn = createCallbackFcn(app, @FrequencyHzEditFieldValueChanged, true);
app.FrequencyHzEditField.FontSize = 24;
app.FrequencyHzEditField.Position = [234 434 100 32];
app.FrequencyHzEditField.Value = 20;

% Create Amplitude0to1EditFieldLabel
app.Amplitude0to1EditFieldLabel = uilabel(app.UIFigure);
app.Amplitude0to1EditFieldLabel.HorizontalAlignment = ‘right’;
app.Amplitude0to1EditFieldLabel.FontSize = 24;
app.Amplitude0to1EditFieldLabel.Position = [38 252 195 31];
app.Amplitude0to1EditFieldLabel.Text = ‘Amplitude (0 to 1)’;

% Create Amplitude0to1EditField
app.Amplitude0to1EditField = uieditfield(app.UIFigure, ‘numeric’);
app.Amplitude0to1EditField.ValueChangedFcn = createCallbackFcn(app, @Amplitude0to1EditFieldValueChanged, true);
app.Amplitude0to1EditField.FontSize = 24;
app.Amplitude0to1EditField.Position = [248 251 100 32];
app.Amplitude0to1EditField.Value = 0.5;

% Create FrequencySlider
app.FrequencySlider = uislider(app.UIFigure);
app.FrequencySlider.Limits = [10 40];
app.FrequencySlider.ValueChangingFcn = createCallbackFcn(app, @FrequencySliderValueChanging, true);
app.FrequencySlider.FontSize = 24;
app.FrequencySlider.Position = [26 418 473 3];
app.FrequencySlider.Value = 20;

% Create AmplitudeSlider
app.AmplitudeSlider = uislider(app.UIFigure);
app.AmplitudeSlider.Limits = [0 1];
app.AmplitudeSlider.MajorTicks = [0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1];
app.AmplitudeSlider.ValueChangingFcn = createCallbackFcn(app, @AmplitudeSliderValueChanging, true);
app.AmplitudeSlider.FontSize = 18;
app.AmplitudeSlider.Position = [20 207 479 3];
app.AmplitudeSlider.Value = 0.5;

% Show the figure after all components are created
app.UIFigure.Visible = ‘on’;
end
end

% App creation and deletion
methods (Access = public)

% Construct app
function app = PotVibrantUI

% Create UIFigure and components
createComponents(app)

% Register the app with App Designer
registerApp(app, app.UIFigure)

if nargout == 0
clear app
end
end

% Code that executes before app deletion
function delete(app)

% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end Dear all,
I work on MATLAB R2023a and Windows 11 23H2.
Thanks to this post I coud do the following code which disconnect safely E:, a USB drive.
Unfortunately, sometimes it does not work, for example, when I change the plug from USB port, it needs several execution to disconnect safely the drive.
I also noticed that in the app (see below), missing run are more frequent. The code is just executed under the button Run (first callback).
The command window shows the message I expect when it works but in fact the USB drive is still visible on "My Computer". If the disconnection works, I see an error message in the command window.
Do you have an idea what can I do to solve this issue or find it origin?
Best regards,
Pierre
The code:
function EjectUSB
% Create the PowerShell command to eject the drive
powershellCommand = ‘(New-Object -comObject Shell.Application).Namespace(17).ParseName(”E:”).InvokeVerb(”Eject”)’;

% Create the command to run PowerShell from MATLAB
command = sprintf(‘powershell -Command "%s"’, powershellCommand);

% Execute the PowerShell command
[status, cmdout] = system(command);

% Display the results
if status == 0
disp([‘Lecteur USB E éjecté avec succès.’]);
else
disp(‘Échec de l”éjection du lecteur USB.’);
disp(cmdout);
end
end

%Add a diskpart list to check if E: has been removed
The app:
classdef PotVibrantUI < matlab.apps.AppBase

% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
AmplitudeSlider matlab.ui.control.Slider
FrequencySlider matlab.ui.control.Slider
Amplitude0to1EditField matlab.ui.control.NumericEditField
Amplitude0to1EditFieldLabel matlab.ui.control.Label
FrequencyHzEditField matlab.ui.control.NumericEditField
FrequencyHzEditFieldLabel matlab.ui.control.Label
RunButton matlab.ui.control.Button
end

properties (Access = private)
frequency = 20; % Default frequency value
amplitude = 0.5; % Default amplitude value
end

% Callbacks that handle component events
methods (Access = private)

% Button pushed function: RunButton
function RunButtonPushed(app, event)
SetupFileCreation(app.frequency)
CustomFileCreation(app.amplitude)
pause(3)
EjectUSB
pause(3)
EjectUSB
end

% Value changing function: FrequencySlider
function FrequencySliderValueChanging(app, event)
changingValue = event.Value;
app.FrequencyHzEditField.Value = changingValue;
% Update the app.frequency property
app.frequency = changingValue;
% guidata() to share variables
end

% Value changed function: FrequencyHzEditField
function FrequencyHzEditFieldValueChanged(app, event)
value = app.FrequencyHzEditField.Value;
app.FrequencySlider.Value = value;
% Update the app.frequency property
app.frequency = value;
end

% Value changing function: AmplitudeSlider
function AmplitudeSliderValueChanging(app, event)
changingValue = event.Value;
app.Amplitude0to1EditField.Value = changingValue;
% Update the app.frequency property
app.amplitude = changingValue;
% guidata() to share variables
end

% Value changed function: Amplitude0to1EditField
function Amplitude0to1EditFieldValueChanged(app, event)
value = app.Amplitude0to1EditField.Value;
app.AmplitudeSlider.Value = value;
app.amplitude = value;
end
end

% Component initialization
methods (Access = private)

% Create UIFigure and components
function createComponents(app)

% Create UIFigure and hide until all components are created
app.UIFigure = uifigure(‘Visible’, ‘off’);
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = ‘MATLAB App’;

% Create RunButton
app.RunButton = uibutton(app.UIFigure, ‘push’);
app.RunButton.ButtonPushedFcn = createCallbackFcn(app, @RunButtonPushed, true);
app.RunButton.FontSize = 24;
app.RunButton.Position = [26 41 568 80];
app.RunButton.Text = ‘Run’;

% Create FrequencyHzEditFieldLabel
app.FrequencyHzEditFieldLabel = uilabel(app.UIFigure);
app.FrequencyHzEditFieldLabel.HorizontalAlignment = ‘right’;
app.FrequencyHzEditFieldLabel.FontSize = 24;
app.FrequencyHzEditFieldLabel.Position = [49 435 170 31];
app.FrequencyHzEditFieldLabel.Text = ‘Frequency (Hz)’;

% Create FrequencyHzEditField
app.FrequencyHzEditField = uieditfield(app.UIFigure, ‘numeric’);
app.FrequencyHzEditField.ValueChangedFcn = createCallbackFcn(app, @FrequencyHzEditFieldValueChanged, true);
app.FrequencyHzEditField.FontSize = 24;
app.FrequencyHzEditField.Position = [234 434 100 32];
app.FrequencyHzEditField.Value = 20;

% Create Amplitude0to1EditFieldLabel
app.Amplitude0to1EditFieldLabel = uilabel(app.UIFigure);
app.Amplitude0to1EditFieldLabel.HorizontalAlignment = ‘right’;
app.Amplitude0to1EditFieldLabel.FontSize = 24;
app.Amplitude0to1EditFieldLabel.Position = [38 252 195 31];
app.Amplitude0to1EditFieldLabel.Text = ‘Amplitude (0 to 1)’;

% Create Amplitude0to1EditField
app.Amplitude0to1EditField = uieditfield(app.UIFigure, ‘numeric’);
app.Amplitude0to1EditField.ValueChangedFcn = createCallbackFcn(app, @Amplitude0to1EditFieldValueChanged, true);
app.Amplitude0to1EditField.FontSize = 24;
app.Amplitude0to1EditField.Position = [248 251 100 32];
app.Amplitude0to1EditField.Value = 0.5;

% Create FrequencySlider
app.FrequencySlider = uislider(app.UIFigure);
app.FrequencySlider.Limits = [10 40];
app.FrequencySlider.ValueChangingFcn = createCallbackFcn(app, @FrequencySliderValueChanging, true);
app.FrequencySlider.FontSize = 24;
app.FrequencySlider.Position = [26 418 473 3];
app.FrequencySlider.Value = 20;

% Create AmplitudeSlider
app.AmplitudeSlider = uislider(app.UIFigure);
app.AmplitudeSlider.Limits = [0 1];
app.AmplitudeSlider.MajorTicks = [0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1];
app.AmplitudeSlider.ValueChangingFcn = createCallbackFcn(app, @AmplitudeSliderValueChanging, true);
app.AmplitudeSlider.FontSize = 18;
app.AmplitudeSlider.Position = [20 207 479 3];
app.AmplitudeSlider.Value = 0.5;

% Show the figure after all components are created
app.UIFigure.Visible = ‘on’;
end
end

% App creation and deletion
methods (Access = public)

% Construct app
function app = PotVibrantUI

% Create UIFigure and components
createComponents(app)

% Register the app with App Designer
registerApp(app, app.UIFigure)

if nargout == 0
clear app
end
end

% Code that executes before app deletion
function delete(app)

% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end usb drive management MATLAB Answers — New Questions

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