Plot to axes from a simulink variable

2012 1 30
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Hi,
I'm trying to plot a variable from simulink in a axes GUI, and that what's happening:
I put the simulation running trought GUI with this command: [timeVector,stateVector,outputVector] = sim('Sistema_s_Atraso_SelfTuning',tempo_simulacao);
and when the simulation ends the ouput variable 'simout' to appear in my base worspace, due to that i can't plot the resulta in my GUI 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 read the output variable and pot in a GUI axes?
Thanks
Nuno

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TAB
TAB 2012-1-30
[I'm using a variable block in simulink]. What is "variable block" ?
Have you tried "ToWorkSpace" block?
You are runnung model manually or using "sim()" command, it dosn't make any difference in simulation output.
Nuno Agualusa
Nuno Agualusa 2012-1-30
yes, it's a "ToWorkSpace" block, called "simout". i'm using the "sim()" command to start the simulation.
My objective is to get the data to plot in a axes GUI after simulation stops.
Thanks
Nuno

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回答（1 个）

Kaustubha Govind
Kaustubha Govind 2012-1-31

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Try
sim('Sistema_s_Atraso_SelfTuning',tempo_simulacao, 'DstWorkspace', 'current');
This ensures that all variables created by Simulink use the current workspace as the destination.
EDIT:
The command needs to be:
opts = simset('DstWorkspace', 'current');
sim('Sistema_s_Atraso_SelfTuning',tempo_simulacao, opts);

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Nuno Agualusa
Nuno Agualusa 2012-1-31
Hi Kaustubha,
Thank you very much for your answer, but the code you gave me doesn't work:
??? Error using ==> INTERFACE_FINAL>run_Callback at 320
The "OPTIONS" parameter must be a structure created by SIMSET.
My problem is not start running simulink from GUI, my problem is when i start the simulation from GUI the variable in simulink 'simout' don't appear in my base workspace, so i can't plot it in a axes. The variable 'simout' is a ToWorkspace block.
But otherwise when i start running the simulation manually from simulink, the variable 'simout' appear in my base worspace, like a 1x1 struct.
I hope i have been clear.
Thank you very much for your time.
Nuno
Kaustubha Govind
Kaustubha Govind 2012-1-31
Nuno: Yes, your problem is clear to me. The problem is that Simulink creates the 'simout' variable in the base workspace by default. To verify this, use "simout = evalin('base', 'simout');" after the SIM command - this will copy the variable from the base workspace to the GUI function workspace and make it available for plotting. Try:
opts = simset('DstWorkspace', 'current');
sim('Sistema_s_Atraso_SelfTuning',tempo_simulacao, opts);
Nuno Agualusa
Nuno Agualusa 2012-2-1
Still the same Kaustubha. The only way to create the variable 'simout' in workspace is start manually the simulink system, if i start the simulink system trought out GUIDE it doesn't work.
Here is the code that i'm using:
function run_Callback(hObject, eventdata, handles)
% hObject handle to run (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
[tempo_simulacao]=evalin('base','tempo_sim');
opts = simset('DstWorkspace', 'current');
[timeVector,stateVector,outputVector]=sim('Sistema_s_Atraso_SelfTuning',tempo_simulacao, opts);
simout = evalin('base', 'simout');
guidata(hObject, handles);
Thank you very much.
Nuno
Kaustubha Govind
Kaustubha Govind 2012-2-1
You only need EITHER "opts = simset('DstWorkspace', 'current');" OR "simout = evalin('base', 'simout');" - not both. Using the first will cause an error in the second statement, because there is no simout variable created in the base workspace in that case.
Nuno Agualusa
Nuno Agualusa 2012-2-1
It didn't work too. I don't know what to do more to solve this situation.
If you don't mind i could send to you my files just to look to them and see if i'm doing somethink wrong in other place.
Thank you very much.
Nuno

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