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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 host
{
// 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);
typedef typename MatrixType2::index_type IndexType;
cusp::array1d<IndexType,cusp::host_memory> starting_pos(A.num_cols+1, 0);
if( A.num_entries > 0 )
{
for( size_t i = 0; i < A.num_entries; i++ )
{
IndexType col = A.column_indices[i];
starting_pos[col+1]++;
}
for( size_t i = 1; i < A.num_cols+1; i++ )
starting_pos[i] += starting_pos[i-1];
for( size_t i = 0; i < A.num_entries; i++ )
{
IndexType col = A.column_indices[i];
IndexType j = starting_pos[col]++;
At.row_indices[j] = A.column_indices[i];
At.column_indices[j] = A.row_indices[i];
At.values[j] = A.values[i];
}
}
}
// 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 IndexType;
At.resize(A.num_cols, A.num_rows, A.num_entries);
if( A.num_entries > 0 )
{
for( size_t i = 0; i < At.num_rows+1; i++ )
At.row_offsets[i] = 0;
for( size_t i = 0; i < At.num_entries; i++ )
{
IndexType col = A.column_indices[i];
At.row_offsets[col+1]++;
}
for( size_t i = 1; i < At.num_rows+1; i++ )
At.row_offsets[i] += At.row_offsets[i-1];
cusp::array1d<IndexType,cusp::host_memory> starting_pos( At.row_offsets );
for( size_t row = 0; row < A.num_rows; row++ )
{
IndexType row_start = A.row_offsets[row];
IndexType row_end = A.row_offsets[row+1];
for( IndexType i = row_start; i < row_end; i++ )
{
IndexType col = A.column_indices[i];
IndexType j = starting_pos[col]++;
At.column_indices[j] = row;
At.values[j] = A.values[i];
}
}
}
}
} // end namespace host
} // end namespace detail
} // end namespace cusp
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