Function PGASetRealInitFraction

• Defined in File real.c

Function Documentation

void PGASetRealInitFraction(PGAContext *ctx, double *median, double *frac)

Set 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 fraction of the median for each allele.

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, *frac;
int i, stringlen;

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

Parameters:

• ctx – context variable

• median – an array containing the mean value of the interval

• frac – an array containing the fraction of median to add and subtract to/from the median to define the interval

Returns:

None