Random.h

Go to the documentation of this file.

/*
 * Expression Template Matrix Library
 *
 * Copyright (C) 2004 - 2006 Ricky Lung <mtlung@users.sourceforge.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


#ifdef _MSC_VER
#   pragma once
#   pragma warning( push )
#   pragma warning( disable : 4786 4512 )
#endif  // _MSC_VER

#ifndef EXMAT_MATH_RANDOM_H
#define EXMAT_MATH_RANDOM_H

#include "../Mat.h"
#include <cmath>
#include <ctime>


namespace exmat {


class UniformRand {
public:
    UniformRand(int seed=time(NULL))
        : min(0), max(1), invRandMax(1.0/RAND_MAX)
    {
        srand(seed);
    }
    UniformRand(double min_, double max_, int seed=time(NULL))
        : min(min_), max(max_), invRandMax(1.0/RAND_MAX)
    {
        if(max < min)
            throw  0;
        srand(seed);
    }

    operator const int() const {
        return int(rand() * invRandMax * (int(max)-int(min)+1) ) + int(min);
    }
    operator const float() const {
        return float(rand() * invRandMax * (max-min) + min);
    }
    operator const double() const {
        return rand() * invRandMax * (max-min) + min;
    }
private:
    const double min, max, invRandMax;
};


template<class Rep, class ErrChk, class RAN> EXMAT_INLINE0 void
randomize(Mat<Rep,ErrChk>& mat, const RAN& ran) {
    typedef typename Rep::value_type value_type;
    typedef typename Rep::index_type index_type;
    for(index_type i=0; i<mat.rows(); ++i) for(index_type j=0; j<mat.cols(); ++j)
        mat.setAt(i, j) = value_type(ran);
}


}   // namespace exmat

#ifdef _MSC_VER
#   pragma warning( pop )
#endif  // _MSC_VER

#endif  // EXMAT_MATH_RANDOM_H

---