Callback and evalin

Question

Sébastien Malengé 2011-5-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6630-callback-and-evalin

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.

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Answer 1

Jarrod Rivituso 2011-5-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6630-callback-and-evalin#answer_9103

在 MATLAB Online 中打开

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

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K E 2012-4-3

Just to be clear, your solution allow running Simulink from within a function and accessing all variables in the function's workspace, right? I haven't been able to do this previously, so this could be helpful.

Jarrod Rivituso 2012-4-3

Yes, that is what the SrcWorkspace argument does. :)

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Answer 2

Paulo Silva 2011-5-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6630-callback-and-evalin#answer_9102

在 MATLAB Online 中打开

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'')']);

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Sébastien Malengé 2011-5-2

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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Answer 3

Sébastien Malengé 2011-5-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6630-callback-and-evalin#answer_9108

在 MATLAB Online 中打开

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...?

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Jarrod Rivituso 2011-5-2

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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