pgaevaluate(1) [debian man page]

PGAEvaluate(1)							      PGAPack							    PGAEvaluate(1)

NAME

       PGAEvaluate - Calls a user-specified function to return an evaluation of each string in the population.

DESCRIPTION

       The  user-specified function is only called if the string has been changed (e.g., by crossover or mutation) or the user has explicitly sig-
       naled the string's evaluation is out-of-date by a call to PGASetEvaluationUpToDateFlag().

INPUT PARAMETERS

       ctx    - context variable
       pop    - symbolic constant of the population to be evaluated
       f      - a pointer to a function to evaluate a string.  This function will be called once for each string in population pop  that  requires
	      evaluation.   This  function must return a double (the evaluation function value) and must fit the prototype double f(PGAContext *c,
	      int p, int pop);
       comm   - an MPI communicator

OUTPUT PARAMETERS

       none

SYNOPSIS

       #include "pgapack.h"
       void  PGAEvaluate(ctx, pop, , comm)
       PGAContext *ctx
       int pop
       double (*f)(PGAContext *, int, int)
       MPI_Comm comm

LOCATION

       parallel.c

EXAMPLE

       Example:
       Evaluate all strings in population PGA_NEWPOP using the user-defined
       evaluation function Energy.

       double Energy(PGAContext *ctx, int p, int pop) {
       :
       };

       PGAContext *ctx;
       :
       PGAEvaluate(ctx, PGA_NEWPOP, Energy, MPI_COMM_WORLD);

								     05/01/95							    PGAEvaluate(1)

PGASetRealInitPercent(2)					      PGAPack						  PGASetRealInitPercent(2)

NAME

       PGASetRealInitPercent - sets the upper and lower bounds for randomly initializing real-valued genes.

DESCRIPTION

       For  each  gene	these bounds define an interval from which the initial allele value is selected uniformly randomly.  With this routine the
       user specifies a median value and a percent offset for each allele.

INPUT PARAMETERS

       ctx    - context variable
       median - an array containing the mean value of the interval
       percent
	      - an array containing the percent offset to add and subtract to the median to define the interval

OUTPUT PARAMETERS

       none

SYNOPSIS

       #include "pgapack.h"
       void  PGASetRealInitPercent(ctx, median, percent)
       PGAContext *ctx
       double *median
       double *percent

LOCATION

       real.c

EXAMPLE

       Set the initialization routines to select a value for each real-valued
       gene i uniformly randomly from the interval [i-v,i+v], where $v = i/2$.
       Assumes all strings are the same length.

       PGAContext *ctx;
       double *median, *percent;
       int i, stringlen;
       :
       stringlen = PGAGetStringLength(ctx);
       median  = (double *) malloc(stringlen*sizeof(double));
       percent = (double *) malloc(stringlen*sizeof(double));
       for(i=0;i<stringlen;i++) {
       median[i]  = (double) i;
       percent[i] = 0.5;
       }
       PGASetRealInitPercent(ctx, median, percent);

								     05/01/95						  PGASetRealInitPercent(2)