.TH PGAStddev 5 "05/01/95" " " "PGAPack"
.SH NAME
PGAStddev \- calculates the standard deviation of an array of elements
.SH INPUT PARAMETERS
.PD 0
.TP
ctx
- context variable
.PD 0
.TP
a
- array to take the standard deviation of
.PD 0
.TP
n
- number of elements in array a
.PD 0
.TP
mean
- the mean of the elements in array a
.PD 1
.SH OUTPUT PARAMETERS
.PD 0
.TP
none

.PD 1
.SH SYNOPSIS
.nf
#include "pgapack.h"
double  PGAStddev(ctx, a, n, mean)
PGAContext *ctx
double *a
int n
double mean
.fi
.SH LOCATION
utility.c
.SH EXAMPLE
.nf
Example:
PGAContext *ctx;
double a[100], mean, sigma;
:
mean  = PGAMean(ctx, a, 100);
sigma = PGAStddev(ctx, a, 100, mean);

.fi