MathStuff.h

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/*
* Copyright (C) 2007-2008 Anael Orlinski
*
* This file is part of Panomatic.
*
* Panomatic 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.
*
* Panomatic 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Panomatic; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef __lfeat_math_h
#define __lfeat_math_h

#include <vector>

#define PI      3.14159

namespace lfeat
{
struct Math
{

    static bool                         SolveLinearSystem33(double* solution, double sq[3][3]);
    static inline double        Abs(const double iD)
    {
        return (iD > 0.0 ? iD : -iD);
    }
    static inline int           Round(const double iD)
    {
        return (int)(iD + 0.5);
    }
    static bool                         Normalize(double* iVec, int iLen);


};

template <int LBound = -128, int UBound = 127, class TResult = double, class TArg = double>
class LUT
{
public:
    explicit LUT (TResult (*f) (TArg), double coeffadd = 0, double coeffmul = 1)
    {
        lut = lut_array - LBound;
        for (int i = LBound; i <= UBound; i++)
        {
            lut[i] = f(coeffmul * (i+coeffadd));
        }
    }

    const TResult& operator()(int i) const
    {
        return lut[i];
    }
private:
    TResult lut_array[UBound - LBound + 1];
    TResult* lut;
};

}

#endif //__lfeat_math_h

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