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// -*- C++ -*-
//
// StandardRandom.cc is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2011 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
//
// This is the implementation of the non-inlined, non-templated member
// functions of the StandardRandom class.
//
#include "StandardRandom.h"
#include "ThePEG/Interface/ClassDocumentation.h"
using namespace ThePEG;
IBPtr StandardRandom::clone() const {
return new_ptr(*this);
}
IBPtr StandardRandom::fullclone() const {
return new_ptr(*this);
}
void StandardRandom::setSeed(long seed) {
if ( seed == -1 ) seed = 19940801;
long ij = seed/30082;
long kl = seed - 30082*ij;
long i = (ij/177) % 177 + 2;
long j = ij % 177 + 2;
long k = (kl/169) % 178 + 1;
long l = kl % 169;
for ( int n = 1 ; n < 98 ; n++ ) {
double s = 0.0;
double t = 0.5;
for ( int m = 1 ; m < 25 ; m++) {
int mm = ( ( (i*j) % 179 ) * k ) % 179;
i = j;
j = k;
k = mm;
l = ( 53 * l + 1 ) % 169;
if ( (l*mm % 64 ) >= 32 )
s += t;
t *= 0.5;
}
u[n-1] = s;
}
c = 362436.0 / 16777216.0;
cd = 7654321.0 / 16777216.0;
cm = 16777213.0 / 16777216.0;
i97 = 96;
j97 = 32;
flush();
}
void StandardRandom::fill() {
for ( int i = 0, N = theNumbers.size(); i < N; ++i ) {
double & uni = theNumbers[i];
do {
uni = u[i97] - u[j97];
if ( uni < 0.0 ) uni++;
u[i97] = uni;
if (i97 == 0) i97 = 96;
else i97--;
if (j97 == 0) j97 = 96;
else j97--;
c -= cd;
if (c < 0.0) c += cm;
uni -= c;
if (uni < 0.0) uni += 1.0;
} while ( uni <= 0.0 || uni >= 1.0 );
}
nextNumber = theNumbers.begin();
}
void StandardRandom::persistentOutput(PersistentOStream & os) const {
os << u << c << cd << cm << i97 << j97;
}
void StandardRandom::persistentInput(PersistentIStream & is, int) {
is >> u >> c >> cd >> cm >> i97 >> j97;
}
ClassDescription<StandardRandom> StandardRandom::initStandardRandom;
void StandardRandom::Init() {
static ClassDocumentation<StandardRandom> documentation
("Interface to the CLHEP::JamesRandom engine class.");
}
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