RAN

 RAN (seed)

 Class:  Nonelemental function - Specific

 Generates a general random number of the multiplicative
 congruential type.  This function returns a different REAL*4 number
 between 0.0 (inclusive) and 1.0 (exclusive) each time it is
 invoked.  The argument must be an INTEGER*4 variable or array
 element.

 For best results, you should initialize the argument to a large,
 odd value before invoking RAN the first time.  To generate
 different sets of random values, initialize the seed to a different
 value on each run.  Do not modify the seed during a run.

 This function cannot be passed as an actual argument.