MatrixComparison.h

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/*
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   The MIT License

   Copyright (c) 2012 Scientific Computing and Imaging Institute,
   University of Utah.

   
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/// @todo Documentation Core/Datatypes/MatrixComparison.h

#ifndef CORE_DATATYPES_MATRIX_COMPARISON_H
#define CORE_DATATYPES_MATRIX_COMPARISON_H 

#include <Core/Datatypes/Matrix.h>
#include <Core/Datatypes/DenseMatrix.h>
#include <Core/Datatypes/DenseColumnMatrix.h>
#include <Core/Datatypes/SparseRowMatrix.h>
#include <Core/Datatypes/MatrixIO.h>

namespace SCIRun {
namespace Core {
namespace Datatypes {

  template <typename T>
  bool operator==(const DenseMatrixGeneric<T>& lhs, const DenseMatrixGeneric<T>& rhs)
  {
    bool returnValue = 
      (lhs.rows() == rhs.rows()) &&
      (lhs.cols() == rhs.cols());

    if (returnValue)
    {
      for (int i = 0; returnValue && i < lhs.rows(); ++i)
      {
        for (int j = 0; returnValue && j < lhs.cols(); ++j)
        {
          returnValue &= std::fabs(lhs(i,j) - rhs(i,j)) < 1e-15;
        }
      }
    }
    return returnValue;
  }

  template <typename T>
  bool operator!=(const DenseMatrixGeneric<T>& lhs, const DenseMatrixGeneric<T>& rhs)
  {
    return !(lhs == rhs);
  }

  template <typename T>
  bool operator==(const DenseColumnMatrixGeneric<T>& lhs, const DenseColumnMatrixGeneric<T>& rhs)
  {
    bool returnValue = (lhs.rows() == rhs.rows());

    if (returnValue)
    {
      for (int i = 0; returnValue && i < lhs.rows(); ++i)
      {
        returnValue &= std::fabs(lhs(i) - rhs(i)) < 1e-15;
      }
    }
    return returnValue;
  }

  template <typename T>
  bool operator!=(const DenseColumnMatrixGeneric<T>& lhs, const DenseColumnMatrixGeneric<T>& rhs)
  {
    return !(lhs == rhs);
  }

  template <typename T>
  bool operator==(const SparseRowMatrixGeneric<T>& lhs, const SparseRowMatrixGeneric<T>& rhs)
  {
    if (lhs.rows() != rhs.rows())
      return false;
    if (lhs.cols() != rhs.cols())
      return false;

    for (int k = 0; k < lhs.outerSize(); ++k)
    {
      typename SparseRowMatrixGeneric<T>::InnerIterator it1(lhs,k);
      typename SparseRowMatrixGeneric<T>::InnerIterator it2(rhs,k);
      for (; it1 && it2; ++it1, ++it2)
      {
        if (it1.index() != it2.index())
          return false;
        if (it1.value() != it2.value())
          return false;
      }
    }
    return true;
  }

  template <typename T>
  bool operator!=(const SparseRowMatrixGeneric<T>& lhs, const SparseRowMatrixGeneric<T>& rhs)
  {
    return !(lhs == rhs);
  }

}}}


#endif