nux-1.14.0
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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 t_int Factorial (t_int n); 00032 t_double BinomialCoefficient (t_int n, t_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 t_double Power (t_double x, t_double y); 00061 00062 t_double Log2 (t_double d); 00063 t_double Floor (t_double d); 00064 00065 00066 } 00067 00068 #endif // MATHFUNCTIONS_H 00069