157 lines
2.9 KiB
C++
157 lines
2.9 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 fn_shift
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//! @{
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// TODO: deprecate shift() in favour of circshift()
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template<typename T1>
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arma_warn_unused
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arma_inline
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typename
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enable_if2
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<
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is_arma_type<T1>::value && resolves_to_vector<T1>::yes,
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const Op<T1, op_shift_vec>
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>::result
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shift
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(
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const T1& X,
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const sword N
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)
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{
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arma_debug_sigprint();
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const uword len = (N < 0) ? uword(-N) : uword(N);
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const uword neg = (N < 0) ? uword( 1) : uword(0);
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return Op<T1, op_shift_vec>(X, len, neg);
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}
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template<typename T1>
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arma_warn_unused
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inline
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typename
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enable_if2
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<
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is_arma_type<T1>::value && resolves_to_vector<T1>::no,
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Mat<typename T1::elem_type>
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>::result
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shift
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(
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const T1& X,
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const sword N
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)
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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 len = (N < 0) ? uword(-N) : uword(N);
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const uword neg = (N < 0) ? uword( 1) : uword(0);
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quasi_unwrap<T1> U(X);
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Mat<eT> out;
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op_shift::apply_noalias(out, U.M, len, neg, 0);
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return out;
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}
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template<typename T1>
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arma_warn_unused
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inline
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typename
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enable_if2
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<
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(is_arma_type<T1>::value),
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Mat<typename T1::elem_type>
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>::result
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shift
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(
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const T1& X,
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const sword N,
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const uword dim
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)
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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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arma_conform_check( (dim > 1), "shift(): parameter 'dim' must be 0 or 1" );
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const uword len = (N < 0) ? uword(-N) : uword(N);
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const uword neg = (N < 0) ? uword( 1) : uword(0);
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quasi_unwrap<T1> U(X);
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Mat<eT> out;
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op_shift::apply_noalias(out, U.M, len, neg, dim);
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return out;
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}
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//
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template<typename T1>
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arma_warn_unused
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inline
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SpMat<typename T1::elem_type>
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shift
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(
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const SpBase<typename T1::elem_type,T1>& expr,
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const sword N,
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const uword dim = 0
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)
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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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arma_conform_check( (dim > 1), "shift(): parameter 'dim' must be 0 or 1" );
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const uword len = (N < 0) ? uword(-N) : uword(N);
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const uword neg = (N < 0) ? uword( 1) : uword(0);
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unwrap_spmat<T1> U(expr.get_ref());
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SpMat<eT> out;
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spop_shift::apply_noalias(out, U.M, len, neg, dim);
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return out;
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}
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//! @}
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