00001 /* @HEADER@ */ 00002 // ************************************************************************ 00003 // 00004 // Sundance 00005 // Copyright (2005) Sandia Corporation 00006 // 00007 // Copyright (year first published) Sandia Corporation. Under the terms 00008 // of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government 00009 // retains certain rights in this software. 00010 // 00011 // This library is free software; you can redistribute it and/or modify 00012 // it under the terms of the GNU Lesser General Public License as 00013 // published by the Free Software Foundation; either version 2.1 of the 00014 // License, or (at your option) any later version. 00015 // 00016 // This library is distributed in the hope that it will be useful, but 00017 // WITHOUT ANY WARRANTY; without even the implied warranty of 00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00019 // Lesser General Public License for more details. 00020 // 00021 // You should have received a copy of the GNU Lesser General Public 00022 // License along with this library; if not, write to the Free Software 00023 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 00024 // USA 00025 // Questions? Contact Kevin Long (krlong@sandia.gov), 00026 // Sandia National Laboratories, Livermore, California, USA 00027 // 00028 // ************************************************************************ 00029 /* @HEADER@ */ 00030 00031 #ifndef SUNDANCE_GAUSS1D_H 00032 #define SUNDANCE_GAUSS1D_H 00033 00034 #include "SundanceDefs.hpp" 00035 #include "Teuchos_Array.hpp" 00036 00037 namespace Sundance 00038 { 00039 using namespace Teuchos; 00040 00041 /** 00042 * Get abscissas and weights for Gauss-Legendre quadrature 00043 * on a line segement. 00044 */ 00045 class Gauss1D 00046 { 00047 public: 00048 /** create an n-point rule on the interval [-1, 1] */ 00049 Gauss1D(int n); 00050 /** create an n-point rule on the interval [a, b] */ 00051 Gauss1D(int n, double a, double b); 00052 00053 /** return the number of points in the rule */ 00054 int nPoints() const {return nodes_.length();} 00055 /** get the abscissas */ 00056 const Array<double>& nodes() const {return nodes_;} 00057 /** get the weights */ 00058 const Array<double>& weights() const {return weights_;} 00059 00060 static bool unitTest(); 00061 private: 00062 void computeWeights(int n, double a, double b); 00063 00064 Array<double> nodes_; 00065 Array<double> weights_; 00066 }; 00067 } 00068 00069 00070 #endif