.TH IM_MEAN_STD 3 "10 May 1991"
.SH NAME
im_mean_std_double_buffer, im_mean_std_int_buffer \- calculates the mean and the std of data held by a by an int or double buffer
.SH SYNOPSIS
.B #include <vips/vips.h>

int im_mean_std_int_buffer(buf, size, mean, std)
.br
.B int *buf;
.br
.B int size;
.br
.B double *mean, *std;

int im_mean_std_double_buffer(buf, size, mean, std)
.br
.B double *buf;
.br
.B int size;
.br
.B double *mean, *std;

.SH DESCRIPTION
im_mean_std_int_buffer() and im_mean_std_double_buffer()
calculate the mean and the standard deviation (std) of data held by the 
integer or double buffer buf.  The buffer has size elements.  The results are
returned to the locations pointed by mean and std.
It is the responsibility of the calling function to ensure that there is
enough data in the buffer.
.SH RETURN VALUE
Both functions returns 0 on success and -1 on error.
.SH SEE\ ALSO
im_avg(3), im_stats(3).
.SH COPYRIGHT
.br
N. Dessipris
.SH AUTHOR
N. Dessipris \- 10/05/1991