Centre Blaise Pascal » HPL sur GPU

.TH HPL_rand 3 "September 10, 2008" "HPL 2.0" "HPL Library Functions"

.SH NAME

HPL_rand \- random number generator.

.SH SYNOPSIS

\fB\&#include "hpl.h"\fR

\fB\&double\fR

\fB\&HPL_rand();\fR

.SH DESCRIPTION

\fB\&HPL_rand\fR

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) = (2^16 * irand[1] + irand[0]) / d - 0.5,  where the

constant d is the largest 32 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.

.SH SEE ALSO

.BR HPL_ladd \ (3),

.BR HPL_lmul \ (3),

.BR HPL_setran \ (3),

.BR HPL_xjumpm \ (3),

.BR HPL_jumpit \ (3).