169 lines
3.7 KiB
C++
169 lines
3.7 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 glue_trapz
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//! @{
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template<typename T1, typename T2>
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inline
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void
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glue_trapz::apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_trapz>& 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;
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const quasi_unwrap<T1> UX(in.A);
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const quasi_unwrap<T2> UY(in.B);
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if( UX.is_alias(out) || UY.is_alias(out) )
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{
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Mat<eT> tmp;
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glue_trapz::apply_noalias(tmp, UX.M, UY.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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glue_trapz::apply_noalias(out, UX.M, UY.M, dim);
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}
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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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glue_trapz::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const Mat<eT>& Y, const uword dim)
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{
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arma_debug_sigprint();
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arma_conform_check( (dim > 1), "trapz(): argument 'dim' must be 0 or 1" );
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arma_conform_check( ((X.is_vec() == false) && (X.is_empty() == false)), "trapz(): argument 'X' must be a vector" );
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const uword N = X.n_elem;
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if(dim == 0)
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{
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arma_conform_check( (N != Y.n_rows), "trapz(): length of X must equal the number of rows in Y when dim=0" );
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}
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else
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if(dim == 1)
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{
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arma_conform_check( (N != Y.n_cols), "trapz(): length of X must equal the number of columns in Y when dim=1" );
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}
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if(N <= 1)
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{
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if(dim == 0) { out.zeros(1, Y.n_cols); }
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else if(dim == 1) { out.zeros(Y.n_rows, 1); }
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return;
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}
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const Col<eT> vec_X( const_cast<eT*>(X.memptr()), X.n_elem, false, true );
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const Col<eT> diff_X = diff(vec_X);
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if(dim == 0)
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{
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const Row<eT> diff_X_t( const_cast<eT*>(diff_X.memptr()), diff_X.n_elem, false, true );
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out = diff_X_t * (0.5 * (Y.rows(0, N-2) + Y.rows(1, N-1)));
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}
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else
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if(dim == 1)
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{
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out = (0.5 * (Y.cols(0, N-2) + Y.cols(1, N-1))) * diff_X;
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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_trapz::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_trapz>& 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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const quasi_unwrap<T1> UY(in.m);
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if(UY.is_alias(out))
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{
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Mat<eT> tmp;
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op_trapz::apply_noalias(tmp, UY.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_trapz::apply_noalias(out, UY.M, dim);
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}
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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_trapz::apply_noalias(Mat<eT>& out, const Mat<eT>& Y, const uword dim)
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{
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arma_debug_sigprint();
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arma_conform_check( (dim > 1), "trapz(): argument 'dim' must be 0 or 1" );
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uword N = 0;
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if(dim == 0) { N = Y.n_rows; }
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else if(dim == 1) { N = Y.n_cols; }
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if(N <= 1)
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{
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if(dim == 0) { out.zeros(1, Y.n_cols); }
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else if(dim == 1) { out.zeros(Y.n_rows, 1); }
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return;
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}
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if(dim == 0)
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{
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out = sum( (0.5 * (Y.rows(0, N-2) + Y.rows(1, N-1))), 0 );
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}
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else
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if(dim == 1)
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{
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out = sum( (0.5 * (Y.cols(0, N-2) + Y.cols(1, N-1))), 1 );
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}
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}
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//! @}
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