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/*
*
* Copyright (C) 2010 - DIGITEO - Michael Baudin
* Copyright (C) 2004 - Bruno Pincon
* Copyright (C) 1999 - G. Marsaglia
*
* PURPOSE
* the kiss generator of G. Marsaglia
* generate random integers (uint) in [0, 2^32 - 1]
* the state is given by 4 integers (z, w, jsr, jcong)
*
* NOTES
* The code was given by G. Marsaglia at the end of a
* thread concerning RNG in C in several newsgroups
* (whom sci.math.num-analysis) "My offer of RNG's for
* C was an invitation to dance..."
*
* Slight modifications by Bruno Pincon for inclusion in
* Scilab (added set/get state routines)
*
* kiss is made of combinaison of severals others but
* they are not interfaced at the scilab level.
*
* Need that it is assumed that the
* unsigned int arithmetic is the classic 32 bits
* unsigned arithmetic modulo 2^32 (ie all is exact
* modulo 2^32)
*
* License: This code is released under public domain.
* (Compatible with CeCILL)
*/
#include <math.h> /* to use floor */
#include "sciprint.h"
#include "others_generators.h"
#include "localization.h"
/* The Marsaglia 's macros : */
#define znew (z=36969*(z&65535)+(z>>16))
#define wnew (w=18000*(w&65535)+(w>>16))
#define MWC ((znew<<16)+wnew )
#define CONG (jcong=69069*jcong+1234567)
#define SHR3 (jsr^=(jsr<<17), jsr^=(jsr>>13), jsr^=(jsr<<5))
#define KISS ((MWC^CONG)+SHR3)
/* the kiss 's state (any int in [0,2^32-1] are OK ?) */
static unsigned int z = 362436069, w = 521288629, jsr = 123456789, jcong = 380116160;
unsigned long int kiss(void)
{
return ( KISS );
}
int set_state_kiss(double g1, double g2, double g3, double g4)
{
if (g1 == floor(g1) && g2 == floor(g2) &&
g3 == floor(g3) && g4 == floor(g4) &&
0.0 <= g1 && g1 <= 4294967295.0 &&
0.0 <= g2 && g2 <= 4294967295.0 &&
0.0 <= g3 && g3 <= 4294967295.0 &&
0.0 <= g4 && g4 <= 4294967295.0 )
{
z = (unsigned int) g1;
w = (unsigned int) g2;
jsr = (unsigned int) g3;
jcong = (unsigned int) g4;
return ( 1 );
}
else
{
sciprint(_("Bad seeds for kiss, must be integers in [0,2^32-1]\n"));
return ( 0 );
}
}
void get_state_kiss(double g[])
{
g[0] = (double) z;
g[1] = (double) w;
g[2] = (double) jsr;
g[3] = (double) jcong;
}
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