GA Toolbox maximization fucntion

there is a Genetic algorithm toolbox. in which the ranking function is only aiming for the minimization of the fitness function i need to find a ranking function which aim for the maximization of the fitness function ....

Answer 1

[Sean de Wolski]

maxfcn = @(x)-minfcn;

Just negate the min function!

[Hamza]

i am not getting you properly. the following is the main code

 FitnV=ranking(ObjV); %this is the the function which is giving me the value by following the goal of minimizing the ObjV.
  ranking_max=@(x)-ranking(ObjV);
  FitnV=ranking_max(ObjV);
%is that what you are trying to say .
this one just converting the FitnV value into negative .
which is not usefull in the program, can you explain little please.

[Sean de Wolski]

The minima of the negation will be the maxima. What you have above looks right to me.

[Hamza]

Thank you very much sir for your help i have one another problem. i want to make random complex numbers like real part between (-0.5 to 0.5) and imaginary also -0.5i to 0.5i .

in the gatbx the range of the variable is found using rep function in matlab like FieldD = [rep([PRECI],[1, NVAR]); rep([-0.5-0.5;+0.5i+0.5i],[1, NVAR]);... rep([1; 0; 1 ;1], [1, NVAR])]; Chrom = crtbp(NIND, NVAR*PRECI); Phen = bs2rv(Chrom,FieldD);

i wrote -0.5-0.5;+0.5i+0.5i. but this is not giving me what i want. in my phenotype this is giving me (random)real-random(imag) and random(real)+random(imag). but it is skipping the numbers like -(random)real+random(imag) or random(real)-random(imag). e.t.c

can you help me with this one ..