Name
HPL_rand random number generator.
Synopsis
#include "hpl.h"
double
HPL_rand();
Description
HPL_rand
generates  the next number  in the  random  sequence.  This
function  ensures  that this number lies in the interval (-0.5, 0.5].
 
The static array irand contains the information (2 integers) required
to generate the  next number  in the sequence  X(n).  This  number is
computed as X(n) = (2^32 * irand[1] + irand[0]) / d - 0.5,  where the
constant d is the largest 64 bit positive integer. The array irand is
then  updated  for the generation of the next number  X(n+1)  in  the
random sequence as follows X(n+1) = a * X(n) + c. The constants a and
c  should have been preliminarily stored in the arrays ias and ics as
2 pairs of integers.  The initialization of  ias,  ics and  irand  is
performed by the function HPL_setran.
See Also
HPL_ladd,
HPL_lmul,
HPL_setran,
HPL_xjumpm,
HPL_jumpit.