SundanceGauss1D.hpp

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//                              Sundance
//                 Copyright (2005) Sandia Corporation
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#ifndef SUNDANCE_GAUSS1D_H
#define SUNDANCE_GAUSS1D_H

#include "SundanceDefs.hpp"
#include "Teuchos_Array.hpp"

namespace Sundance
{
using namespace Teuchos;

/**
 * Get abscissas and weights for Gauss-Legendre quadrature 
 * on a line segement.
 */
class Gauss1D
{
public:
  /** create an n-point rule on the interval [-1, 1] */
  Gauss1D(int n);
  /** create an n-point rule on the interval [a, b] */
  Gauss1D(int n, double a, double b);

  /** return the number of points in the rule */
  int nPoints() const {return nodes_.length();}
  /** get the abscissas */
  const Array<double>& nodes() const {return nodes_;}
  /** get the weights */
  const Array<double>& weights() const {return weights_;}

  static bool unitTest();
private:
  void computeWeights(int n, double a, double b);

  Array<double> nodes_;
  Array<double> weights_;
};
}


#endif