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nux  3.0.0
MathFunctions.h
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00001 /*
00002  * Copyright 2010 Inalogic® Inc.
00003  *
00004  * This program is free software: you can redistribute it and/or modify it
00005  * under the terms of the GNU Lesser General Public License, as
00006  * published by the  Free Software Foundation; either version 2.1 or 3.0
00007  * of the License.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranties of
00011  * MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
00012  * PURPOSE.  See the applicable version of the GNU Lesser General Public
00013  * License for more details.
00014  *
00015  * You should have received a copy of both the GNU Lesser General Public
00016  * License along with this program. If not, see <http://www.gnu.org/licenses/>
00017  *
00018  * Authored by: Jay Taoko <jaytaoko@inalogic.com>
00019  *
00020  */
00021 
00022 
00023 #ifndef MATHFUNCTIONS_H
00024 #define MATHFUNCTIONS_H
00025 
00026 #include "Constants.h"
00027 
00028 namespace nux
00029 {
00030 
00031   int Factorial (int n);
00032   double BinomialCoefficient (int n, int k);
00033 
00034 
00036 
00040   template<class T> inline
00041   T PowerInt (T _X, int _Y)   // taken from Microsoft <math.h>
00042   {
00043     unsigned int _N;
00044 
00045     if (_Y >= 0)
00046       _N = _Y;
00047     else
00048       _N = -_Y;
00049 
00050     for (T _Z = T (1); ; _X *= _X)
00051     {
00052       if ( (_N & 1) != 0)
00053         _Z *= _X;
00054 
00055       if ( (_N >>= 1) == 0)
00056         return (_Y < 0 ? T (1) / _Z : _Z);
00057     }
00058   }
00059 
00060   double Power (double x, double y);
00061 
00062   double Log2 (double d);
00063   double Floor (double d);
00064 
00065 
00066 }
00067 
00068 #endif // MATHFUNCTIONS_H
00069