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)