nux-1.16.0
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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 #include "../NuxCore.h" 00024 #include "MathFunctions.h" 00025 00026 00027 namespace nux 00028 { 00029 00030 t_int Factorial (t_int n) 00031 { 00032 t_int i = 1; 00033 00034 while (0 < n) 00035 { 00036 i *= n; 00037 n--; 00038 } 00039 00040 return i; 00041 } 00042 00043 t_double BinomialCoefficient (t_int n, t_int k) 00044 { 00045 if (n < 0) 00046 NUX_BREAK_ASM_INT3; 00047 00048 if (k < 0 || k > n) 00049 return 0.0; 00050 00051 t_double d = (t_double) Factorial (n) / (t_double) (Factorial (n - k) * Factorial (k) ); 00052 return d; 00053 } 00054 00055 t_double Power (t_double x, t_double y) 00056 { 00057 return std::pow (x, y); 00058 } 00059 00060 t_double Log2 (t_double d) 00061 { 00062 return std::log (d) / std::log (2.0); 00063 } 00064 00065 t_double Floor (t_double d) 00066 { 00067 return std::floor (d); 00068 } 00069 00070 }