BVG-SPEC:  Specify a bivariate Gaussian distribution to sample from.

BVG-spec creates a log file with a record specifying a bivariate
Gaussian distribution, or displays the specification in an existing
log file.

Usage:

   bvg-spec log-file std1 std2 corr [ replication ]

or:

   bvg-spec log-file

When called with arguments other than a log file name, it creates a
log file of that name, and stores in it the standard deviations of the
bivariate Gaussian along the two axes, and the correlation of the two
axes.

The optional replication argument results in a multivariate Gaussian
distribution obtained by creating that number of independent bivariate
Gaussian variables.

When called with only the log file as an argument, the program reads
this record from an existing log file and displays the values stored.

The specifications are stored in the log file as a single record of
type 'B' and index -1,

            Copyright (c) 1995-2004 by Radford M. Neal