---
name: "PGASetRealInitPercent"
section: "2"
platform: "linux"
package: "pgapack"
version: "1.1.1-3"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/PGASetRealInitPercent"
---

# PGASetRealInitPercent(2)

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

## 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);
```