Callback and evalin

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Sébastien Malengé
Sébastien Malengé on 2 May 2011
Hi, my code :
function [] = P_call(varargin)
P = varargin{3};
X = get (P.po, 'value');
model_path = 'D:\MATLAB\GUI\';
scenarios_path = [model_path 'Scenarios\'];
scenarios_p = dir([scenarios_path 'TS_Sy_MooN_P_*.m']);
if ~isempty(X)
evalin('base', 'load(''default_values'')');
evalin('base', 'run(''scenarios_p(X).name'')');
evalin('base', 'run(''import_ch_inputs'')');
% sim('MooN_simu_1_2');
end
close(gcbf)
My problem : I don't know how to run this :
evalin('base', 'run(''scenarios_p(X).name'')');
Matlab don't know scenarios_p(X) etc, and I understand why, but I don't know what can I put to replace this, anybody...?
Thanks.

Answers (4)

Jarrod Rivituso
Jarrod Rivituso on 2 May 2011
Also, not sure if you are aware of this, but you can have the Simulink model resolve variables in the caller workspace instead of the base workspace
outp = sim('MooN_simu_1_2','SrcWorkspace','current');
This might help you avoid having to do all these base workspace assignments
  2 Comments
Jarrod Rivituso
Jarrod Rivituso on 3 Apr 2012
Yes, that is what the SrcWorkspace argument does. :)

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Paulo Silva
Paulo Silva on 2 May 2011
The evalin is evaluating the argument X in the workspace but X only exists in your current function, try like this
evalin('base', ['run(''scenarios_p(' num2str(X) ').name'')']);
  1 Comment
Sébastien Malengé
Sébastien Malengé on 2 May 2011
Don't works (but the problem isn't the same I think).
Matlab looking for scenarios_p(X) now, and don't find it because scenarios_p is in my function too. I have this error now :
??? Error using ==> run at 76
scenario_p(1) not found.
Error in ==> Test>P_call at 121
evalin('base', ['run(''scenario_p(' num2str(X) ')'')']);
??? Error while evaluating uicontrol Callback

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Sébastien Malengé
Sébastien Malengé on 2 May 2011
Okay, so my new code is :
function [] = P_call(varargin)
P = varargin{3};
X = get (P.po, 'value');
model_path = 'D:\MATLAB\GUI\';
scenarios_path = [model_path 'Scenarios\'];
scenarios_p = dir([scenarios_path 'TS_Sy_MooN_P_*.m']);
if ~isempty(X)
evalin('base', 'load(''default_values'')');
scenario_p = [scenarios_path scenarios_p(X).name];
evalin('base', ['run(''scenario_p(' num2str(X) ')'')']);
% sim('MooN_simu_1_2');
end
Still don't works, because now Matlab looking for scenario_p, and it's don't exist in the workspace...
How can I simply put model_path, scenarios_path and scenarios_p in the workspace ? Or save scenario_p(X) in the workspace ? (scenario_p is m file, not mat)
Thanks !
Ps : @Jarrod Rivituso : Sorry, I don't understand what you're speaking. What's the goal of your code...?
  1 Comment
Jarrod Rivituso
Jarrod Rivituso on 2 May 2011
When you add parameters to a Simulink model, the model tries to resolve those parameters in the MATLAB base workspace.
When you call "sim" from within a function, it can be difficult if you still are allowing Simulink to resolve parameters in the base workspace. This is because your function has to use evalin or assignin to modify the base workspace.
Alternatively, you can define everything in your function workspace from within your function, and then call sim like I have shown to get Simulink to resolve parameters to your function workspace.
Does that make sense?

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Sébastien Malengé
Sébastien Malengé on 2 May 2011
I find a solution, thanks.
  2 Comments
Guy Rouleau
Guy Rouleau on 3 Apr 2012
K E, you might want to look at this:
http://www.mathworks.com/support/solutions/en/data/1-ASPEIV/index.html

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