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/*
* Copyright 2014-2015 The University of Queensland
* http://www.uq.edu.au
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <cusp/format.h>
#include <cusp/detail/functional.h>
#include <cusp/detail/host/spmv.h>
#include <cusp/detail/host/transposed_spmv.h>
namespace cusp
{
namespace detail
{
namespace host
{
/////////////////////////////////////////////
// Dense Transposed Matrix-Vector Multiply //
/////////////////////////////////////////////
template <typename Matrix,
typename Vector1,
typename Vector2>
void transposed_multiply(const Matrix& A,
const Vector1& B,
Vector2& C,
cusp::array2d_format,
cusp::array1d_format,
cusp::array1d_format)
{
typedef typename Vector2::value_type ValueType;
for(size_t i = 0; i < A.num_cols; i++)
{
ValueType sum = 0;
for(size_t j = 0; j < A.num_rows; j++)
{
sum += A(j,i) * B[j];
}
C[i] = sum;
}
}
//////////////////////////////////////////////
// Sparse Transposed Matrix-Vector Multiply //
//////////////////////////////////////////////
template <typename Matrix,
typename Vector1,
typename Vector2>
void transposed_multiply(const Matrix& A,
const Vector1& B,
Vector2& C,
cusp::cds_format,
cusp::array1d_format,
cusp::array1d_format)
{
if (A.symmetric)
cusp::detail::host::spmv_cds(A, B, C);
else
cusp::detail::host::transposed_spmv_cds(A, B, C);
}
template <typename Matrix,
typename Vector1,
typename Vector2>
void transposed_multiply(const Matrix& A,
const Vector1& B,
Vector2& C,
cusp::dia_format,
cusp::array1d_format,
cusp::array1d_format)
{
if (A.symmetric)
cusp::detail::host::spmv_dia(A, B, C);
else
cusp::detail::host::transposed_spmv_dia(A, B, C);
}
/////////////////
// Entry Point //
/////////////////
template <typename Matrix,
typename MatrixOrVector1,
typename MatrixOrVector2>
void transposed_multiply(const Matrix& A,
const MatrixOrVector1& B,
MatrixOrVector2& C)
{
cusp::detail::host::transposed_multiply(A, B, C,
typename Matrix::format(),
typename MatrixOrVector1::format(),
typename MatrixOrVector2::format());
}
} // end namespace host
} // end namespace detail
} // end namespace cusp
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