175 lines
3.6 KiB
C++
175 lines
3.6 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_cumsum
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//! @{
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template<typename eT>
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inline
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void
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op_cumsum::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const uword dim)
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{
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arma_debug_sigprint();
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uword n_rows = X.n_rows;
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uword n_cols = X.n_cols;
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out.set_size(n_rows,n_cols);
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if(out.n_elem == 0) { return; }
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if(dim == 0)
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{
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if(n_cols == 1)
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{
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const eT* X_mem = X.memptr();
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eT* out_mem = out.memptr();
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eT acc = eT(0);
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for(uword row=0; row < n_rows; ++row)
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{
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acc += X_mem[row];
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out_mem[row] = acc;
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}
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}
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else
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{
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for(uword col=0; col < n_cols; ++col)
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{
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const eT* X_colmem = X.colptr(col);
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eT* out_colmem = out.colptr(col);
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eT acc = eT(0);
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for(uword row=0; row < n_rows; ++row)
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{
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acc += X_colmem[row];
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out_colmem[row] = acc;
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}
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}
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}
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}
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else
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if(dim == 1)
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{
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if(n_rows == 1)
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{
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const eT* X_mem = X.memptr();
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eT* out_mem = out.memptr();
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eT acc = eT(0);
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for(uword col=0; col < n_cols; ++col)
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{
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acc += X_mem[col];
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out_mem[col] = acc;
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}
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}
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else
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{
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if(n_cols > 0)
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{
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arrayops::copy( out.colptr(0), X.colptr(0), n_rows );
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for(uword col=1; col < n_cols; ++col)
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{
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const eT* out_colmem_prev = out.colptr(col-1);
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eT* out_colmem = out.colptr(col );
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const eT* X_colmem = X.colptr(col );
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for(uword row=0; row < n_rows; ++row)
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{
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out_colmem[row] = out_colmem_prev[row] + X_colmem[row];
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}
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}
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}
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}
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}
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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_cumsum::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_cumsum>& 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 uword dim = in.aux_uword_a;
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arma_conform_check( (dim > 1), "cumsum(): parameter 'dim' must be 0 or 1" );
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const quasi_unwrap<T1> U(in.m);
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if(U.is_alias(out))
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{
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Mat<eT> tmp;
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op_cumsum::apply_noalias(tmp, U.M, dim);
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out.steal_mem(tmp);
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}
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else
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{
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op_cumsum::apply_noalias(out, U.M, dim);
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}
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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_cumsum_vec::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_cumsum_vec>& 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 quasi_unwrap<T1> U(in.m);
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const uword dim = (T1::is_xvec) ? uword(U.M.is_rowvec() ? 1 : 0) : uword((T1::is_row) ? 1 : 0);
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if(U.is_alias(out))
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{
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Mat<eT> tmp;
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op_cumsum::apply_noalias(tmp, U.M, dim);
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out.steal_mem(tmp);
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}
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else
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{
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op_cumsum::apply_noalias(out, U.M, dim);
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}
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}
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//! @}
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