Number of variables (NVARS) must be a positive integer.

I want to run a project using genetic algorithm but I get this error every time.

I know what is it but I don't know how to fix it.

this is my project that I attached and the main function is GAmodule.

you can start with these numbers :

235
2
1
4
0
0
0
10
0
0
5
0
10
0
0
1000
g
700
Thank you

[dpb]

Don't know what is in the zip file, but note that '0' is not a positive integer.

Answer 1

[Star Strider]

In this line (Line 163):

[x,fval]=ga(@(x) penalty2(x,available,bc,Dof,E,f,fixedcoord,na,nb,neft,nevt,nl,nn,numbitCoordX,numbitCoordY,numbitCoordZ,numbitEdof,numbitEp,sq,TOPGSM,xspan,yspan,zspan),(nn-nb-nl)*(numbitCoordX+numbitCoordY+numbitCoordZ)+(neft+nevt)*numbitEp+2*nevt*numbitEdof,options);

the ga function is taking this value:

(nn-nb-nl)*(numbitCoordX+numbitCoordY+numbitCoordZ)+(neft+nevt)*numbitEp+2*nevt*numbitEdof

to be ‘nvars’. It has to be an integer >0. I would use the ceil function to round it up to the next integer value, and include a check that it is >0.

For example, put this assignment and if block somewhere before your ga call:

Nvars = ceil((nn-nb-nl)*(numbitCoordX+numbitCoordY+numbitCoordZ)+(neft+nevt)*numbitEp+2*nevt*numbitEdof);  
if Nvars <= 0
    error('NVARS must be greater than zero.')
end

then when it meets the criteria, use ‘Nvars’ (or whatever you want to call it) in your ga call.

[Hessam]

Thanks, It is a good idea.

The problem was all Y-coordinates = 0, therefore yspan=0 and numbitcoordY=-Inf

[Star Strider]

My pleasure!

(I’ll take your word for it!)