165 lines
3.2 KiB
C++
165 lines
3.2 KiB
C++
// Copyright (C) 2015 National ICT Australia (NICTA)
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// -------------------------------------------------------------------
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//
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// Written by Conrad Sanderson - http://conradsanderson.id.au
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//! \addtogroup op_cumprod
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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_cumprod::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const uword dim)
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{
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arma_extra_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(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(1);
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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(1);
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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(1);
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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_cumprod::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_cumprod>& in)
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{
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arma_extra_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_debug_check( (dim > 1), "cumprod(): 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_cumprod::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_cumprod::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_cumprod_default::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_cumprod_default>& in)
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{
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arma_extra_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_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_cumprod::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_cumprod::apply_noalias(out, U.M, dim);
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}
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}
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//! @}
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