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/*
* This is a test program for PGAPack. The objective is to maximize the
* number of 'z's in a chromosome.
*/
#include <pgapack.h>
double NumberOfZs(PGAContext *, int, int);
int myMutation(PGAContext *, int, int, double);
int GetIntegerParameter(char *query);
/*******************************************************************
* user main program *
*******************************************************************/
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_CHARACTER, len, PGA_MAXIMIZE);
PGASetRandomSeed(ctx, 1);
PGASetMaxGAIterValue(ctx, maxiter);
PGASetUserFunction(ctx, PGA_USERFUNCTION_MUTATION, (void *)myMutation);
PGASetUp(ctx);
PGARun(ctx, NumberOfZs);
PGADestroy(ctx);
MPI_Finalize();
return(0);
}
/*******************************************************************
* user defined evaluation function *
* ctx - contex variable *
* p - chromosome index in population *
* pop - which population to refer to *
*******************************************************************/
double NumberOfZs(PGAContext *ctx, int p, int pop) {
int i, nzs;
int stringlen;
stringlen = PGAGetStringLength(ctx);
nzs = 0;
for ( i=0; i<stringlen; i++ )
if (PGAGetCharacterAllele(ctx, p, pop, i) == 'z')
nzs++;
return((double) nzs);
}
/* Custom mutation function. Searches for an unset bit,
* then sets it. Returns the number of bits that are changed.
*/
int myMutation(PGAContext *ctx, int p, int pop, double mr) {
int i, count;
char c;
count = 0;
for (i=PGAGetStringLength(ctx)-1; i>=0; i--) {
if (PGARandomFlip(ctx, mr)) {
c = PGAGetCharacterAllele(ctx, p, pop, i);
if (c != 'z') {
PGASetCharacterAllele(ctx, p, pop, i, c+1);
count++;
}
}
}
return(count);
}
/* 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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