circulant_matrix_operations.hpp

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#ifndef VIENNACL_LINALG_CIRCULANT_MATRIX_OPERATIONS_HPP_
#define VIENNACL_LINALG_CIRCULANT_MATRIX_OPERATIONS_HPP_

/* =========================================================================
   Copyright (c) 2010-2015, Institute for Microelectronics,
                            Institute for Analysis and Scientific Computing,
                            TU Wien.
   Portions of this software are copyright by UChicago Argonne, LLC.

                            -----------------
                  ViennaCL - The Vienna Computing Library
                            -----------------

   Project Head:    Karl Rupp                   rupp@iue.tuwien.ac.at

   (A list of authors and contributors can be found in the manual)

   License:         MIT (X11), see file LICENSE in the base directory
============================================================================= */

#include "viennacl/forwards.h"
#include "viennacl/ocl/backend.hpp"
#include "viennacl/scalar.hpp"
#include "viennacl/vector.hpp"
#include "viennacl/tools/tools.hpp"
#include "viennacl/fft.hpp"
//#include "viennacl/linalg/kernels/coordinate_matrix_kernels.h"

namespace viennacl
{
namespace linalg
{

// A * x

template<typename NumericT, unsigned int AlignmentV>
void prod_impl(viennacl::circulant_matrix<NumericT, AlignmentV> const & mat,
               viennacl::vector_base<NumericT> const & vec,
               viennacl::vector_base<NumericT>       & result)
{
  assert(mat.size1() == result.size() && bool("Dimension mismatch"));
  assert(mat.size2() == vec.size() && bool("Dimension mismatch"));
  //result.clear();

  //std::cout << "prod(circulant_matrix" << ALIGNMENT << ", vector) called with internal_nnz=" << mat.internal_nnz() << std::endl;

  viennacl::vector<NumericT> circ(mat.elements().size() * 2);
  viennacl::linalg::real_to_complex(mat.elements(), circ, mat.elements().size());

  viennacl::vector<NumericT> tmp(vec.size() * 2);
  viennacl::vector<NumericT> tmp2(vec.size() * 2);

  viennacl::linalg::real_to_complex(vec, tmp, vec.size());
  viennacl::linalg::convolve(circ, tmp, tmp2);
  viennacl::linalg::complex_to_real(tmp2, result, vec.size());

}

} //namespace linalg
} //namespace viennacl


#endif