ran(3F)

NAME
     ran - Pseudo random number generator

SYNOPSIS
     integer iseed
     real *4 ran, x

     x = ran(iseed)

DESCRIPTION
     ran generates successive pseudo-random numbers in the range from 0 to
     1.  ran uses its integer argument to calculate the return value.  The
     argument is modified by ran so that successive invocations of ran with
     the same integer variable will yield different values.

     It is not recommended to invoke ran with a constant because the
     storage area holding the constant will be modified.

NOTES
     ran is implemented as a library function, not an intrinsic.

SEE ALSO
     rand(3F)