NAME

       PGAFitness - Maps the user's evaluation function value to a fitness value.

DESCRIPTION

       First,  the  user's  evaluation function value is translated to all positive values if any
       are negative.  Next, this positive sequence is translated to a maximization problem if the
       user's  optimization direction was minimization.  This positive sequence is then mapped to
       a fitness value using linear ranking, linear normalization fitness, or the identity (i.e.,
       the evaluation function value).  This routine is usually used after PGAEvaluate is called.

INPUT PARAMETERS

       ctx    - context variable
       pop    - symbolic constant of the population to calculate fitness for

OUTPUT PARAMETERS

       none

SYNOPSIS

       #include "pgapack.h"
       void  PGAFitness(ctx, popindex)
       PGAContext *ctx
       int popindex

LOCATION

       fitness.c

EXAMPLE

       Example:
       Calculate the fitness of all strings in population PGA_NEWPOP after
       calling PGAEvaluate to calculate the strings evaluation value.

       double energy(PGAContext *ctx, int p, int pop);
       PGAContext *ctx;
       :
       PGAEvaluate(ctx, PGA_NEWPOP, energy);
       PGAFitness (ctx, PGA_NEWPOP);

                                             05/01/95                               PGAFitness(1)