Linux Certif

Toute la documentation sur la certification Linux LPI

PGAFitness

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);