Cannot use sim command in genetic algorithm

Question

Imisi Jo 2017-7-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/349498-cannot-use-sim-command-in-genetic-algorithm

评论： Imisi Jo 2017-7-25

For some reason I cannot seem to run the sim command to simulate a model which is required to estimate parameters in the model which the genetic algorithm will do. I pass the objective function to ga:

%%load measured data
load('data_R01_full','simVol_TECM','simTime_TECM','simSoC_TECM','simOCV_TECM');
cap=0;
R0=47e-3;
%%set bounds
lb=[0;47e-3]; %cap, R0
ub=[0.2;75e-3];
%%est fcn
estfcn=@(x) gafunc(x,simVol_TECM,simOCV_TECM,simSoC_TECM,simTime_TECM);
%%estimation
[xOpt,fVal] = ga(estfcn,2,[],[],[],[],lb,ub);A

And my objective function starts with this:

    function G = gafunc(x,Vbat_meas,OCV_meas,SoC_meas,t_meas)
    open('gatest_ss_standalone');
    run 'ga_standalone_tests';%loads all the variables necessary for simulation 
    cap_val=x(1);
    R0=x(2);
    [tout,~,output]=sim('gatest_ss_standalone',StopTime);
    close('gatest_ss_standalone')

It never simulates because I get an error saying some parameters are undefined in the model, even though I have specified it in the script 'ga_standalone_tests'. Anyone know why I get this error?

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Answer 1

Walter Roberson 2017-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/349498-cannot-use-sim-command-in-genetic-algorithm#answer_274837

Possibly your model is expecting to get the parameters from the base workspace. Some of the ways of fetching parameters can be configured specifically to look in the base workspace instead of in the current workspace.

Some of the blocks such as From Workspace normally look in the workspace of the function that calls sim() if the model is called by sim(), but look in the base workspace if the model is called by clicking on the model Run button or from the Simulink menus.

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Walter Roberson 2017-7-20

What techniques are you using to fetch parameters from a workspace?

Imisi Jo 2017-7-25

Figured it out! Like you said, I had to ensure the workspace I was using was the current workspace so I used simset('SrcWorkspace','Current'). Thanks for your suggestion!

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