?? random.cc
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/*************************************************************************** Random.cc - description ------------------- begin : Fri Nov 10 2000 copyright : (C) 2000 by Christian Blum email : cblum@ulb.ac.be ***************************************************************************//*************************************************************************** * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * * (at your option) any later version. * * * ***************************************************************************/#include "Random.h"#include <stdio.h>#define VERBOSE(x) x#define VERYVERBOSE(x)/* pseudo-random number generator as proposed in numerical recipes in C Input: a long value; has to be the seed variable Output: a pseudo-random number uniformly distributed in [0,1] Side effects: changes the value of the input variable, must be this way*/double Random::ran01( long *idum ){ long k; double ans; k =(*idum)/IQ; *idum = IA * (*idum - k * IQ) - IR * k; if (*idum < 0 ) *idum += IM; ans = AM * (*idum); return ans;}long int* Random::generate_array(const int& size) { long int i, j, help; long int *v; v = (long int*) malloc( size * sizeof(long int) ); for ( i = 0 ; i < size; i++ ) v[i] = i; for ( i = 0 ; i < size-1 ; i++) { j = (long int) ( ran01( &seed ) * (size - i)); assert( i + j < size ); help = v[i]; v[i] = v[i+j]; v[i+j] = help; } VERYVERBOSE ( printf("Random vector:\n"); for (i = 0 ; i < size ; i++ ) printf(" %ld ",v[i]); printf("\n"); ) return v;}
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