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/*
* This is a test program for PGAPack. The objective is to maximize each
* allele. The evaluation function sums all allele values.
*/
#include <pgapack.h>
double evaluate(PGAContext *, int, int);
int myMutation(PGAContext *, int, int, double);
int GetIntegerParameter(char *query);
int main(int argc, char **argv) {
PGAContext *ctx;
int len, maxiter;
MPI_Init(&argc, &argv);
len = GetIntegerParameter("String length?\n");
maxiter = GetIntegerParameter("How many iterations?\n");
ctx = PGACreate(&argc, argv, PGA_DATATYPE_INTEGER, len, PGA_MAXIMIZE);
PGASetRandomSeed(ctx, 1);
PGASetUserFunction(ctx, PGA_USERFUNCTION_MUTATION, (void *)myMutation);
PGASetIntegerInitPermute(ctx, 1, len);
PGASetMaxGAIterValue(ctx, maxiter);
PGASetNumReplaceValue(ctx, 90);
PGASetMutationAndCrossoverFlag(ctx, PGA_TRUE);
PGASetPrintOptions(ctx, PGA_REPORT_AVERAGE);
PGASetUp(ctx);
PGARun(ctx, evaluate);
PGADestroy(ctx);
MPI_Finalize();
return(0);
}
int myMutation(PGAContext *ctx, int p, int pop, double mr) {
int stringlen, i, v, count;
stringlen = PGAGetStringLength(ctx);
count = 0;
for (i=stringlen-1; i>=0; i--) {
if (PGARandomFlip(ctx, mr)) {
v = PGARandomInterval(ctx, 1, stringlen);
PGASetIntegerAllele(ctx, p, pop, i, v);
count++;
}
}
return((double)count);
}
double evaluate(PGAContext *ctx, int p, int pop) {
int stringlen, i, sum;
stringlen = PGAGetStringLength(ctx);
sum = 0;
for (i=stringlen-1; i>=0; i--)
sum += PGAGetIntegerAllele(ctx, p, pop, i);
return((double)sum);
}
/* Get an integer parameter from the user. Since this is
* typically a parallel program, we must only do I/O on the
* "master" process -- process 0. Once we read the parameter,
* we broadcast it to all the other processes, then every
* process returns the correct value.
*/
int GetIntegerParameter(char *query) {
int rank, tmp;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if (rank == 0) {
printf(query);
scanf("%d", &tmp);
}
MPI_Bcast(&tmp, 1, MPI_INT, 0, MPI_COMM_WORLD);
return(tmp);
}
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