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/*
* Copyright 2008-2009 NVIDIA Corporation
*
* 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.
*/
#include <cusp/format.h>
// TODO replace with detail/array2d_utils.h or something
#include <cusp/array2d.h>
#include <cusp/coo_matrix.h>
#include <cusp/csr_matrix.h>
#include <cusp/detail/utils.h>
#include <cusp/detail/format_utils.h>
#include <thrust/functional.h>
#include <thrust/gather.h>
#include <thrust/sequence.h>
#include <thrust/sort.h>
#include <thrust/iterator/counting_iterator.h>
#include <thrust/iterator/transform_iterator.h>
#include <thrust/iterator/zip_iterator.h>
namespace cusp
{
namespace detail
{
namespace device
{
// COO format
template <typename MatrixType1, typename MatrixType2>
void transpose(const MatrixType1& A, MatrixType2& At,
cusp::coo_format,
cusp::coo_format)
{
At.resize(A.num_cols, A.num_rows, A.num_entries);
cusp::copy(A.row_indices, At.column_indices);
cusp::copy(A.column_indices, At.row_indices);
cusp::copy(A.values, At.values);
At.sort_by_row();
}
// CSR format
template <typename MatrixType1, typename MatrixType2>
void transpose(const MatrixType1& A, MatrixType2& At,
cusp::csr_format,
cusp::csr_format)
{
typedef typename MatrixType2::index_type IndexType2;
typedef typename MatrixType2::memory_space MemorySpace2;
At.resize(A.num_cols, A.num_rows, A.num_entries);
cusp::detail::offsets_to_indices(A.row_offsets, At.column_indices);
cusp::copy(A.values, At.values);
cusp::array1d<IndexType2,MemorySpace2> At_row_indices(A.column_indices);
cusp::detail::sort_by_row(At_row_indices, At.column_indices, At.values);
cusp::detail::indices_to_offsets(At_row_indices, At.row_offsets);
}
} // end namespace device
} // end namespace detail
} // end namespace cusp
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