Error with GA: Conversion to double from struct is not possible.

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I’m trying to optimize stiffness of a spring in a train suspension system by GA. I get the value of fitness function from “To workspace” block, from a simulink model named “R1” which do a co-simulation by SIMPACK for getting the final result. As I run GA the following error occurs:
??? The following error occurred converting from struct to double:
Error using ==> double
Conversion to double from struct is not possible.
Error in ==> fcnvectorizer at 14
y(i,:) = feval(fun,(pop(i,:)));
Error in ==> makeState at 47
Score =
fcnvectorizer(state.Population(initScoreProvided+1:end,:),FitnessFcn,1,options.SerialUserFcn);
Error in ==> gaunc at 41
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);
Error in ==> ga at 291
[x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...
Caused by:
Failure in user-supplied fitness function evaluation. GA cannot continue.
28 rethrow(userFcn_ME)
I don’t know how can I eliminate this weird error? I’m pressed with time unfortunately. Here is my code:
function [R]=Ride(d1)
%Calling the Function to Update Variables
'SubvarUpd';
%Running GA for Simulink Block
options = simset('SrcWorkspace','current');
R1
sim('R1',[],options)
R=RideComfortindex
And “SubvarUpd” function is:
function SubvarUpd(d1)
kpx=d1;
fileID = fopen('F:\MST\Optimization\1\mysubvar.subvar','w'); %This is the address of SubVar file
% Longitudinal Stiffness subvar:
fprintf(fileID,'%s','subvar($_Rnom, str = ''');
fprintf(fileID,'%d',kpx);
  1 个评论
Geoff Hayes
Geoff Hayes 2014-11-30
Katie - what is your fitness function because it isn't clear from the above code which (of the functions that you provided) it is. The error is telling you that there is a problem with it, so you may want to take a closer look at this function.

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