In MATLB versions until R2021a I could write ASCII values stored in a CHAR array into a string as unsigned char by:
data = char([126, 129]); % Exceeds 7 bit ASCII
file = fullfile(tempdir, ‘test.dat’);
[fid, msg] = fopen(file, ‘w’);
assert(fid ~= -1, msg);
fwrite(fid, data); % Write uchar until R2021b
fclose(fid);
This wrote the unsigned chars [126, 129] untill R2021b:
[fid, msg] = fopen(file, ‘r’);
bytes = fread(fid, [1, inf], ‘uint8’); % < R2021b: [126, 129]
Since R2021b the bytes are converted to UTF-8 and the file contains [126, 194, 129], so a specification is required:
fwrite(fid, data, ‘uchar’); % < R2024b: [126, 129], R2024b: [126, 194, 129]
In R2024b this writes [126, 194, 129] again. Intuitively I’ve tried:
fwrite(fid, data, ‘uint8’); % R2024b: [126, 194, 129] also
Playing with the encoding type in fopen does not help also. My questions:
Is there a low level method to write UCHARs stored in a CHAR vector using fopen / fwrite without a Unicode conversion?
This change of behaviour breaks a lot of my codes. Is this considered to be useful?
What is the best way to write unsigned bytes without dependency to the platform?
A workaround is the casting to UINT8:
fwrite(fid, uint8(data), ‘uint8’);
But duplicating data in memory without a reason is a waste of time.In MATLB versions until R2021a I could write ASCII values stored in a CHAR array into a string as unsigned char by:
data = char([126, 129]); % Exceeds 7 bit ASCII
file = fullfile(tempdir, ‘test.dat’);
[fid, msg] = fopen(file, ‘w’);
assert(fid ~= -1, msg);
fwrite(fid, data); % Write uchar until R2021b
fclose(fid);
This wrote the unsigned chars [126, 129] untill R2021b:
[fid, msg] = fopen(file, ‘r’);
bytes = fread(fid, [1, inf], ‘uint8’); % < R2021b: [126, 129]
Since R2021b the bytes are converted to UTF-8 and the file contains [126, 194, 129], so a specification is required:
fwrite(fid, data, ‘uchar’); % < R2024b: [126, 129], R2024b: [126, 194, 129]
In R2024b this writes [126, 194, 129] again. Intuitively I’ve tried:
fwrite(fid, data, ‘uint8’); % R2024b: [126, 194, 129] also
Playing with the encoding type in fopen does not help also. My questions:
Is there a low level method to write UCHARs stored in a CHAR vector using fopen / fwrite without a Unicode conversion?
This change of behaviour breaks a lot of my codes. Is this considered to be useful?
What is the best way to write unsigned bytes without dependency to the platform?
A workaround is the casting to UINT8:
fwrite(fid, uint8(data), ‘uint8’);
But duplicating data in memory without a reason is a waste of time. In MATLB versions until R2021a I could write ASCII values stored in a CHAR array into a string as unsigned char by:
data = char([126, 129]); % Exceeds 7 bit ASCII
file = fullfile(tempdir, ‘test.dat’);
[fid, msg] = fopen(file, ‘w’);
assert(fid ~= -1, msg);
fwrite(fid, data); % Write uchar until R2021b
fclose(fid);
This wrote the unsigned chars [126, 129] untill R2021b:
[fid, msg] = fopen(file, ‘r’);
bytes = fread(fid, [1, inf], ‘uint8’); % < R2021b: [126, 129]
Since R2021b the bytes are converted to UTF-8 and the file contains [126, 194, 129], so a specification is required:
fwrite(fid, data, ‘uchar’); % < R2024b: [126, 129], R2024b: [126, 194, 129]
In R2024b this writes [126, 194, 129] again. Intuitively I’ve tried:
fwrite(fid, data, ‘uint8’); % R2024b: [126, 194, 129] also
Playing with the encoding type in fopen does not help also. My questions:
Is there a low level method to write UCHARs stored in a CHAR vector using fopen / fwrite without a Unicode conversion?
This change of behaviour breaks a lot of my codes. Is this considered to be useful?
What is the best way to write unsigned bytes without dependency to the platform?
A workaround is the casting to UINT8:
fwrite(fid, uint8(data), ‘uint8’);
But duplicating data in memory without a reason is a waste of time. ascii, uchar, fwrite, fopen, unicode MATLAB Answers — New Questions

​

Hello everyone,
I’m currently working on a project in Simulink where I need to control 3D objects in real-time. These objects are connected to controllers like a mouse or a robot. For instance, I have a cursor that moves based on mouse input, and its position changes continuously.
I have been using Simulink Desktop Real-Time (SLDRT) to achieve the real-time performance required for my project. However, I’ve learned that in upcoming versions of MATLAB, the Virtual Reality (VR) Sink blocks used for 3D visualization will be removed. The MATLAB documentation suggests using Simulation 3D blocks (like Simulation 3D Scene Configuration, Simulation 3D Actor, etc.) as replacements.
I attempted to implement these Simulation 3D blocks, but I’ve run into several limitations, which are also detailed Unreal Engine Simulation Environment Requirements and Limitations – MATLAB & Simulink – MathWorks Italia. The main issue is that the Simulation 3D blocks do not support SLDRT. When I try to run my model, I receive the following error: "The selected system target file ‘sldrt.tlc’ is not currently supported for concurrent execution."
My question is: How can I achieve real-time 3D visualization in Simulink, given that the VR Sink blocks are being deprecated and the Simulation 3D blocks don’t support SLDRT? Are there alternative methods or tools that I can use to visualize my 3D models in real-time while still using SLDRT?

Any advice or suggestions would be greatly appreciated!
Thank you.Hello everyone,
I’m currently working on a project in Simulink where I need to control 3D objects in real-time. These objects are connected to controllers like a mouse or a robot. For instance, I have a cursor that moves based on mouse input, and its position changes continuously.
I have been using Simulink Desktop Real-Time (SLDRT) to achieve the real-time performance required for my project. However, I’ve learned that in upcoming versions of MATLAB, the Virtual Reality (VR) Sink blocks used for 3D visualization will be removed. The MATLAB documentation suggests using Simulation 3D blocks (like Simulation 3D Scene Configuration, Simulation 3D Actor, etc.) as replacements.
I attempted to implement these Simulation 3D blocks, but I’ve run into several limitations, which are also detailed Unreal Engine Simulation Environment Requirements and Limitations – MATLAB & Simulink – MathWorks Italia. The main issue is that the Simulation 3D blocks do not support SLDRT. When I try to run my model, I receive the following error: "The selected system target file ‘sldrt.tlc’ is not currently supported for concurrent execution."
My question is: How can I achieve real-time 3D visualization in Simulink, given that the VR Sink blocks are being deprecated and the Simulation 3D blocks don’t support SLDRT? Are there alternative methods or tools that I can use to visualize my 3D models in real-time while still using SLDRT?

Any advice or suggestions would be greatly appreciated!
Thank you. Hello everyone,
I’m currently working on a project in Simulink where I need to control 3D objects in real-time. These objects are connected to controllers like a mouse or a robot. For instance, I have a cursor that moves based on mouse input, and its position changes continuously.
I have been using Simulink Desktop Real-Time (SLDRT) to achieve the real-time performance required for my project. However, I’ve learned that in upcoming versions of MATLAB, the Virtual Reality (VR) Sink blocks used for 3D visualization will be removed. The MATLAB documentation suggests using Simulation 3D blocks (like Simulation 3D Scene Configuration, Simulation 3D Actor, etc.) as replacements.
I attempted to implement these Simulation 3D blocks, but I’ve run into several limitations, which are also detailed Unreal Engine Simulation Environment Requirements and Limitations – MATLAB & Simulink – MathWorks Italia. The main issue is that the Simulation 3D blocks do not support SLDRT. When I try to run my model, I receive the following error: "The selected system target file ‘sldrt.tlc’ is not currently supported for concurrent execution."
My question is: How can I achieve real-time 3D visualization in Simulink, given that the VR Sink blocks are being deprecated and the Simulation 3D blocks don’t support SLDRT? Are there alternative methods or tools that I can use to visualize my 3D models in real-time while still using SLDRT?

Any advice or suggestions would be greatly appreciated!
Thank you. matlab, simulink, sldrt, simulation MATLAB Answers — New Questions

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I’ve got 6 Tabs in GUI, but one is hidden in the startup fcn. Hidden tab called "Hybrid" is used when user wants to change the engine from Solid one to Hybrid – if so, the Solid one is hidden and the Hybrid appears.
Problem description: I’m using the Browse button (e.g. in Solid tab) right when I start the GUI, and it works – file is imported to GUI, and the Label shows the title of the file. But when I change from Solid to Hybrid and then from Hybrid to Solid again, this button does not work – browse pop up is shown, I choose the file, but then there’s no title in the Label, the whole app designer does not respond (+ there is an error sound wherever I click with my mouse, but no errors in the command window).
To hide tabs I’ve used one of the solutions in Matlab Answer which was to add 2 lines in startupfcn:
app.tg = matlab.ui.container.TabGroup;
app.TabGroup.Children(2).Parent = app.tg;

app.iteration=1;
User can switch between the tabs using both:
1) 2 buttons, "SolidToHybrid", "HybridToSolid" – and their callback:
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
2) 2 Switches with the same callback:
if mod(app.iteration, 2) == 0
value = app.Switch.Value;
else
value = app.Switch_2.Value;
end
app.iteration=app.iteration+1;

if strcmp(value,’Hybrid’)
app.Switch.Value="Hybrid";
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
else
app.Switch_2.Value="Solid";
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
end
this "deletes" all tabs that are to the right and adding the chosen one + the deleted rest in the correct order.
The order of tabs: "First", "Solid", ("Hybrid"), "Fourth", "Fifth", "Sixth"
I’ve chosen 2 options to eliminate e.g. infinite loops connected with switch (I thought it could be a problem), but it seems like there’s a different problem since in both cases "Browsing files" does not work.

Edit: Maybe there’s a different, easier way to hide Tabs but with the similar outcome – always only one is visible.I’ve got 6 Tabs in GUI, but one is hidden in the startup fcn. Hidden tab called "Hybrid" is used when user wants to change the engine from Solid one to Hybrid – if so, the Solid one is hidden and the Hybrid appears.
Problem description: I’m using the Browse button (e.g. in Solid tab) right when I start the GUI, and it works – file is imported to GUI, and the Label shows the title of the file. But when I change from Solid to Hybrid and then from Hybrid to Solid again, this button does not work – browse pop up is shown, I choose the file, but then there’s no title in the Label, the whole app designer does not respond (+ there is an error sound wherever I click with my mouse, but no errors in the command window).
To hide tabs I’ve used one of the solutions in Matlab Answer which was to add 2 lines in startupfcn:
app.tg = matlab.ui.container.TabGroup;
app.TabGroup.Children(2).Parent = app.tg;

app.iteration=1;
User can switch between the tabs using both:
1) 2 buttons, "SolidToHybrid", "HybridToSolid" – and their callback:
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
2) 2 Switches with the same callback:
if mod(app.iteration, 2) == 0
value = app.Switch.Value;
else
value = app.Switch_2.Value;
end
app.iteration=app.iteration+1;

if strcmp(value,’Hybrid’)
app.Switch.Value="Hybrid";
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
else
app.Switch_2.Value="Solid";
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
end
this "deletes" all tabs that are to the right and adding the chosen one + the deleted rest in the correct order.
The order of tabs: "First", "Solid", ("Hybrid"), "Fourth", "Fifth", "Sixth"
I’ve chosen 2 options to eliminate e.g. infinite loops connected with switch (I thought it could be a problem), but it seems like there’s a different problem since in both cases "Browsing files" does not work.

Edit: Maybe there’s a different, easier way to hide Tabs but with the similar outcome – always only one is visible. I’ve got 6 Tabs in GUI, but one is hidden in the startup fcn. Hidden tab called "Hybrid" is used when user wants to change the engine from Solid one to Hybrid – if so, the Solid one is hidden and the Hybrid appears.
Problem description: I’m using the Browse button (e.g. in Solid tab) right when I start the GUI, and it works – file is imported to GUI, and the Label shows the title of the file. But when I change from Solid to Hybrid and then from Hybrid to Solid again, this button does not work – browse pop up is shown, I choose the file, but then there’s no title in the Label, the whole app designer does not respond (+ there is an error sound wherever I click with my mouse, but no errors in the command window).
To hide tabs I’ve used one of the solutions in Matlab Answer which was to add 2 lines in startupfcn:
app.tg = matlab.ui.container.TabGroup;
app.TabGroup.Children(2).Parent = app.tg;

app.iteration=1;
User can switch between the tabs using both:
1) 2 buttons, "SolidToHybrid", "HybridToSolid" – and their callback:
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
2) 2 Switches with the same callback:
if mod(app.iteration, 2) == 0
value = app.Switch.Value;
else
value = app.Switch_2.Value;
end
app.iteration=app.iteration+1;

if strcmp(value,’Hybrid’)
app.Switch.Value="Hybrid";
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
else
app.Switch_2.Value="Solid";
app.tg.Children(1).Parent = app.TabGroup;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(3).Parent = app.tg;
app.TabGroup.Children(2).Parent = app.tg;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
app.tg.Children(1).Parent = app.TabGroup;
end
this "deletes" all tabs that are to the right and adding the chosen one + the deleted rest in the correct order.
The order of tabs: "First", "Solid", ("Hybrid"), "Fourth", "Fifth", "Sixth"
I’ve chosen 2 options to eliminate e.g. infinite loops connected with switch (I thought it could be a problem), but it seems like there’s a different problem since in both cases "Browsing files" does not work.

Edit: Maybe there’s a different, easier way to hide Tabs but with the similar outcome – always only one is visible. gui, app designer MATLAB Answers — New Questions

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