GA error due to boxdirections

Question

Joe 2014-4-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126546-ga-error-due-to-boxdirections

回答： Rakesh Kumar 2020-10-14

I know there was a similar post in the forum ( here ), but my problem is definitely not because of typos in the objective function, because it works perfectly under patternsearch and simulatedannealing. I constantly get the error shown below here and this problem is so annoying that I couldn't sleep well lately, so any advice is greatly appreciated. It seems weird to me because I couldn't find anywhere in GA algorithm to set MeshSize. Version is Matlab 2012b.

"

Error using / Matrix dimensions must agree.
Error in boxdirections (line 23) pollParam = 1/sqrt(MeshSize);
Error in mutationadaptfeasible (line 71) [Basis,TangentCone] = boxdirections(true,StepSize,x,linCon.lb,linCon.ub,tol);
Error in stepGA (line 36) mutateKids = feval(options.MutationFcn, parents((1 + 2 * nXoverKids):end), options,GenomeLength,FitnessFcn,state,thisScore,thisPopulation,options.MutationFcnArgs{:});
Error in galincon (line 63) [score,population,state] = stepGA(score,population,options,state,GenomeLength,FitnessFcn);
Error in ga (line 351) [x,fval,exitFlag,output,population,scores] = galincon(FitnessFcn,nvars, ...
Error in GAOptimDesign (line 8) [x,fval] = ga(ObjectiveFunction,nvars,[],[],[],[],LB,UB)
"
My command for invoking GA is:
"
run ii_parameter_TBE.m; % to generate initial values, lb and ub of parameters 
load parameter.mat;
load bound.mat;
options = gaoptimset('TolFun',1e-3,'PopulationSize',length(parameter)*2,'Display','diagnose');
rng('default')
[x,fval,exitFlag,output] = ga(@ii_objective,length(parameter),[],[],[],[],lb,ub,[],[],options);
"

Best regards,

Joe

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Answer 1

yvette-hyq 2015-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/126546-ga-error-due-to-boxdirections#answer_175472

编辑：yvette-hyq 2015-4-17

Hi Joe,

Just wonder if you have found the cause of the problem. I have the exact problem as yours. The initialisation of this variable as I can trace back to is in line 28 to 44;

StepSize = 1;

in mutationadaptfeasible.m. But I don't see what the problem is when it comes to boxdirections.m.

I appreciate if you can share some suggestions. Thank you very much.

Yvette