63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
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// Copyright 2008-2016 National ICT Australia (NICTA)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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//! \addtogroup op_sp_diagvec
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//! @{
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template<typename T1>
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inline
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void
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op_sp_diagvec::apply(Mat<typename T1::elem_type>& out, const mtSpReduceOp<typename T1::elem_type, T1,op_sp_diagvec>& in)
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{
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arma_debug_sigprint();
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typedef typename T1::elem_type eT;
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const unwrap_spmat<T1> U(in.m);
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const SpMat<eT>& X = U.M;
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const uword a = in.aux_uword_a;
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const uword b = in.aux_uword_b;
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const uword row_offset = (b > 0) ? a : 0;
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const uword col_offset = (b == 0) ? a : 0;
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arma_conform_check_bounds
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(
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((row_offset > 0) && (row_offset >= X.n_rows)) || ((col_offset > 0) && (col_offset >= X.n_cols)),
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"diagvec(): requested diagonal out of bounds"
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);
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const uword len = (std::min)(X.n_rows - row_offset, X.n_cols - col_offset);
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out.set_size(len, 1);
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eT* out_mem = out.memptr();
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for(uword i=0; i < len; ++i)
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{
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out_mem[i] = X.at(i + row_offset, i + col_offset);
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}
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}
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//! @}
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