cant find cause of non-singleton

Dear All,

I am using ga tool to optimize a vector for A*x-B=0

I conclude with the help of this forum http://www.mathworks.co.uk/matlabcentral/answers/41852-ga-fitness that a fitness function like this:

FitnessFcn = @(x)sum(abs(bsxfun(@minus,sum(bsxfun(@times,A,x),2),B)),1)

is working for the example below for A <5x4>

A =

      2.1000    3.4000  101.0000   -2.0000
      1.1000  -89.0000   33.0000   56.0000
    -49.0000   -0.1900   92.0000   31.0000
      4.2000    5.2000    0.1000   19.0000
     40.0000   22.0000   12.0000   44.0000

and B <5x1>

B =

    104.5000
      1.1000
     73.8100
     28.5000
    118.0000

By using [x]=ga(FitnessFcn,4)

But when I import file A <2100x24> and B <2100x1> (checked in the workspace tab)

I take :

??? Error using ==> bsxfun
Non-singleton dimensions of the two input arrays must match each other.

Error in ==> @(x)sum(abs(bsxfun(@minus,sum(bsxfun(@times,A,x),2),B)),1)

Error in ==> validate>@(x)fitness(x,FitnessFcnArgs{:}) at 136
    fitness = @(x) fitness(x,FitnessFcnArgs{:});

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 279
        [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Caused by:
    Failure in user-supplied fitness function evaluation. GA cannot continue.

I would be really grateful for your help since its really odd for me this behavior. Thanks for your time

Chris

[chris]

forgot to say I am using [x]=ga(FitnessFcn,24) in the second case

[Jan]

Dear chris, you can edit the original message instead of adding important details as a comment.

Answer 1

[Jan]

Usually dbstop if error helps to reveal such problems. Then Matlab stops, when the error occurs and you can inspect the current dimensions of the variables.