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How do I plot Simulink signal values saved to the MATLAB workspace on an axes?

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andoni
andoni on 31 May 2011
Commented: Walter Roberson on 26 Jul 2017
I have to plot a signals in a MATLAB gui.
With Simulink I make a simulation and I save the signal in the workspace. I want to plot that signal in a gui axes but I dont know what I have to do.

Accepted Answer

Arnaud Miege
Arnaud Miege on 31 May 2011
I assume you run the Simulink model from the MATLAB GUI using the sim command. The data from your Scope will end up in the GUI (caller) workspace rather than the base workspace. So you should be able to plot it using something like:
plot(ScopeData.time, ScopeData.signals.values)
You may need to specify the handle of the axis on which to plot the data.
Also have a look at this technical solution.
HTH,
Arnaud

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Arnaud Miege
Arnaud Miege on 31 May 2011
No, it isn't, but you indicated that you want to plot the signals in the MATLAB GUI, so I logically assume that you wanted to run the Simulink model from the GUI as well. It does have the advantage that the data will be readily available in the GUI workspace rather than the base workspace.

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More Answers (5)

Walter Roberson
Walter Roberson on 31 May 2011
Are you using a "To Workspace" block? If so then when you look at the variable, what class() and size() is it? And what kind of plot are you thinking of?

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Fangjun Jiang
Fangjun Jiang on 31 May 2011
Use the command that Amaud Miege gave above.
plot(ScopeData.time, ScopeData.signals.values)
Walter Roberson
Walter Roberson on 31 May 2011
Though before that you might need to add
ScopeData = evalin('base', ScopeData);
in order to import the data from the base workspace in to the workspace of the current function.

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Nuno Agualusa
Nuno Agualusa on 28 Jan 2012
Hi,
I'm facing the same problem, but with a small diference. I'm running the simulink from GUI, but when the simulation finish doesn't apear a variable 'simout' in my base workspace. So i can´t plot the result on axes. I'm using a variable block in simulink, to get all the data to worspace. The only way that i found to get a variable in base workspace, is to run the simulation manualy in simulink.
what can i do to solve this situation?
Thank you very much.
Nuno

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Kaustubha Govind
Kaustubha Govind on 30 Jan 2012
How are you running the SIM command? You might want to set 'DstWorkspace' to 'current' to make sure that Simulink uses your GUI function workspace as the destination workspace.
Nuno Agualusa
Nuno Agualusa on 30 Jan 2012
yes, the running command that i used is:
[tempo_simulacao]=evalin('base','tempo_sim');
[timeVector,stateVector,outputVector]=sim('Sistema_s_Atraso_SelfTuning',tempo_simulacao);
The problem is when a simulation ends i can't plot in my GUI axes the result of the simulation..and this action has to be peformed only trought out GUI.

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erhan
erhan on 30 Nov 2013
I want set guı axes from scope value. Can you give example ?

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yati j
yati j on 9 Oct 2016
Edited: Walter Roberson on 9 Oct 2016
Hello, Could u suggest me any tutorial or any solution to this
  • i have my motor dc to run
  • when the dc motor run/rotate, maybe a graph pop-up which is read my motor speed or relevant to the rotation
  • i dont know the connection btween component
  • i dont know how to draw the simulink
i've read and watched a lot of tutorial.
Thank You.

tran xuanminh
tran xuanminh on 26 Jul 2017
Edited: Walter Roberson on 26 Jul 2017
>>plot(ScopeData.time,ScopeData.signals.values);
>>grid on;
??? >>plot(ScopeData.time,ScopeData.signals.values);
|
Error: Unexpected MATLAB operator.
please coment my erro, thanks

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