GammaFunction.h
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00001 /***************************************************************************** 00002 * Copyright (C) 2011 by Benjamin Hadorn (b_hadorn@bluewin.ch) 00003 ***************************************************************************** 00004 * Project : Zeus Math Library 00005 * Module : GammaFunction 00006 * Package : Zeus.ZeusMath.Calculus 00007 * Author : Benjamin Hadorn 00008 * Date : 27.12.2011 00009 * System : Zeus-Framework 00010 ***************************************************************************** 00011 * Licence: * 00012 * This library is free software; you can redistribute it and/or modify * 00013 * it under the terms of the GNU Lesser General Public License as * 00014 * published by the Free Software Foundation; either version * 00015 * 2.1 of the License, or (at your option) any later version. * 00016 * * 00017 * This library is distributed in the hope that it will be useful, * 00018 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00019 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 00020 * GNU Lesser General Public License for more details. * 00021 * * 00022 * You should have received a copy of the GNU Lesser General Public * 00023 * License along with this library; if not, write to the Free Software * 00024 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA * 00025 *****************************************************************************/ 00026 00027 /***************************************************************************** 00028 * Changes: 00029 * 27.12.2011 bha: created zeus 2.0 00030 *****************************************************************************/ 00031 00032 #ifndef GammaFunctionH 00033 #define GammaFunctionH 00034 00035 #include <zeusmath/Config/PlatformDefines.hpp> 00036 #include <zeusbase/System/ZObject.h> 00037 00038 BEGIN_NAMESPACE_Zeus 00039 00040 /****************************************************************************/ 00045 /****************************************************************************/ 00046 zeusmath_class TGammaFunction : public TZObject 00047 { 00048 public: 00049 static Float getGamma(const Float& rfX); 00050 static Float getIncompleteGamma(const Float& rfA, const Float& rfX); 00051 00052 protected: 00053 inline TGammaFunction() {} 00054 inline virtual ~TGammaFunction() {} 00055 00056 private: 00057 static Float getGammaStirF(const Float& rfX); 00058 static Float getLnGamma(const Float& rfX, Float& fSgngam); 00059 static Float getIncompleteGammaC(const Float& rfA, const Float& rfX); 00060 }; 00061 00062 00063 END_NAMESPACE_Zeus 00064 00065 #endif