95 lines
2.2 KiB
C++
95 lines
2.2 KiB
C++
// 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_range
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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_range::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_range>& 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), "range(): parameter 'dim' must be 0 or 1" );
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const quasi_unwrap<T1> U(in.m);
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const Mat<eT>& X = U.M;
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if(U.is_alias(out) == false)
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{
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op_range::apply_noalias(out, X, dim);
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}
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else
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{
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Mat<eT> tmp;
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op_range::apply_noalias(tmp, X, dim);
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out.steal_mem(tmp);
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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_range::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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// TODO: replace with dedicated implementation which finds min and max at the same time
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out = max(X,dim) - min(X,dim);
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}
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template<typename T1>
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inline
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typename T1::elem_type
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op_range::vector_range(const T1& expr)
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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(expr);
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const Mat<eT>& X = U.M;
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const eT* X_mem = X.memptr();
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const uword N = X.n_elem;
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if(N == 0)
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{
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arma_debug_check(true, "range(): object has no elements");
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return Datum<eT>::nan;
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}
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// TODO: replace with dedicated implementation which finds min and max at the same time
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return op_max::direct_max(X_mem, N) - op_min::direct_min(X_mem, N);
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}
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//! @}
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