---
name: "PGAEncodeRealAsGrayCode"
section: "3"
platform: "linux"
package: "pgapack"
version: "1.0.0.1-3"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/PGAEncodeRealAsGrayCode/3"
---

# PGAEncodeRealAsGrayCode(3)

encodes a real value as a binary reflected Gray code sequence

## NAME

PGAEncodeRealAsGrayCode - encodes a real value as a binary reflected Gray code sequence

## INPUT PARAMETERS

- ctx

  \- context variable

- p

  \- string index

- pop

  \- symbolic constant of the population the string is in

- start

  \- starting bit position in p to encode val in

- end

  \- ending bit position in p to encode val in

- low

  \- lower bound of the interval the val is defined on

- high

  \- lower bound of the interval the val is defined on

- val

  \- the real number to be represented as a binary string

## OUTPUT PARAMETERS

- side

  \-effect.

## SYNOPSIS

```
#include "pgapack.h"
void  PGAEncodeRealAsGrayCode(ctx, p, pop, start, end, low, high, val)
PGAContext *ctx
int p
int pop
int start
int end
double low
double high
double val
```

## LOCATION

evaluate.c

## EXAMPLE

```
Encode 3.14 from the interval [0,10] in 30 bits in bit positions
0--29 in string p in population PGA_NEWPOP as a binary reflected Gray
code sequence.
PGAContext *ctx;
int p;
:
PGAEncodeRealAsGrayCode(ctx, p, PGA_NEWPOP, 0, 29, 0.0, 10.0, 3.14);
```