269 lines
6.3 KiB
C++
269 lines
6.3 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_reshape
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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_reshape::apply_unwrap(Mat<eT>& out, const Mat<eT>& A, const uword in_n_rows, const uword in_n_cols)
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{
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arma_extra_debug_sigprint();
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const bool is_alias = (&out == &A);
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const uword in_n_elem = in_n_rows * in_n_cols;
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if(A.n_elem == in_n_elem)
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{
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if(is_alias == false)
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{
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out.set_size(in_n_rows, in_n_cols);
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arrayops::copy( out.memptr(), A.memptr(), out.n_elem );
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}
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else // &out == &A, i.e. inplace reshape
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{
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out.set_size(in_n_rows, in_n_cols);
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// set_size() doesn't destroy data as long as the number of elements in the matrix remains the same
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}
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}
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else
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{
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const unwrap_check< Mat<eT> > B_tmp(A, is_alias);
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const Mat<eT>& B = B_tmp.M;
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const uword n_elem_to_copy = (std::min)(B.n_elem, in_n_elem);
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out.set_size(in_n_rows, in_n_cols);
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eT* out_mem = out.memptr();
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arrayops::copy( out_mem, B.memptr(), n_elem_to_copy );
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for(uword i=n_elem_to_copy; i<in_n_elem; ++i) { out_mem[i] = eT(0); }
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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_reshape::apply_proxy(Mat<typename T1::elem_type>& out, const Proxy<T1>& P, const uword in_n_rows, const uword in_n_cols)
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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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out.set_size(in_n_rows, in_n_cols);
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eT* out_mem = out.memptr();
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const uword in_n_elem = in_n_rows * in_n_cols;
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if(P.get_n_elem() == in_n_elem)
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{
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if(Proxy<T1>::use_at == false)
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{
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typename Proxy<T1>::ea_type Pea = P.get_ea();
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for(uword i=0; i < in_n_elem; ++i) { out_mem[i] = Pea[i]; }
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}
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else
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{
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const uword P_n_rows = P.get_n_rows();
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const uword P_n_cols = P.get_n_cols();
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for(uword col=0; col < P_n_cols; ++col)
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{
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uword i,j;
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for(i=0, j=1; j < P_n_rows; i+=2, j+=2)
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{
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const eT tmp_i = P.at(i,col);
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const eT tmp_j = P.at(j,col);
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*out_mem = tmp_i; out_mem++;
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*out_mem = tmp_j; out_mem++;
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}
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if(i < P_n_rows)
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{
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*out_mem = P.at(i,col); out_mem++;
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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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{
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const uword n_elem_to_copy = (std::min)(P.get_n_elem(), in_n_elem);
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if(Proxy<T1>::use_at == false)
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{
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typename Proxy<T1>::ea_type Pea = P.get_ea();
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for(uword i=0; i < n_elem_to_copy; ++i) { out_mem[i] = Pea[i]; }
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}
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else
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{
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uword i = 0;
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const uword P_n_rows = P.get_n_rows();
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const uword P_n_cols = P.get_n_cols();
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for(uword col=0; col < P_n_cols; ++col)
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for(uword row=0; row < P_n_rows; ++row)
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{
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if(i >= n_elem_to_copy) { goto nested_loop_end; }
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out_mem[i] = P.at(row,col);
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++i;
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}
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nested_loop_end: ;
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}
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for(uword i=n_elem_to_copy; i < in_n_elem; ++i) { out_mem[i] = eT(0); }
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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_reshape::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_reshape>& 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 in_n_rows = in.aux_uword_a;
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const uword in_n_cols = in.aux_uword_b;
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// allow detection of in-place reshape
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if(is_Mat<T1>::value || is_Mat<typename Proxy<T1>::stored_type>::value)
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{
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const unwrap<T1> U(in.m);
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op_reshape::apply_unwrap(out, U.M, in_n_rows, in_n_cols);
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}
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else
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{
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const Proxy<T1> P(in.m);
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if(P.is_alias(out))
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{
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Mat<eT> tmp;
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op_reshape::apply_proxy(tmp, P, in_n_rows, in_n_cols);
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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_reshape::apply_proxy(out, P, in_n_rows, in_n_cols);
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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_reshape::apply(Cube<typename T1::elem_type>& out, const OpCube<T1,op_reshape>& 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 unwrap_cube<T1> A_tmp(in.m);
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const Cube<eT>& A = A_tmp.M;
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const uword in_n_rows = in.aux_uword_a;
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const uword in_n_cols = in.aux_uword_b;
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const uword in_n_slices = in.aux_uword_c;
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const uword in_n_elem = in_n_rows * in_n_cols * in_n_slices;
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if(A.n_elem == in_n_elem)
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{
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if(&out != &A)
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{
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out.set_size(in_n_rows, in_n_cols, in_n_slices);
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arrayops::copy( out.memptr(), A.memptr(), out.n_elem );
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}
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else // &out == &A, i.e. inplace resize
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{
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out.set_size(in_n_rows, in_n_cols, in_n_slices);
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// set_size() doesn't destroy data as long as the number of elements in the cube remains the same
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}
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}
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else
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{
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const unwrap_cube_check< Cube<eT> > B_tmp(A, out);
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const Cube<eT>& B = B_tmp.M;
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const uword n_elem_to_copy = (std::min)(B.n_elem, in_n_elem);
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out.set_size(in_n_rows, in_n_cols, in_n_slices);
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eT* out_mem = out.memptr();
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arrayops::copy( out_mem, B.memptr(), n_elem_to_copy );
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for(uword i=n_elem_to_copy; i < in_n_elem; ++i) { out_mem[i] = eT(0); }
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}
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}
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//! NOTE: deprecated
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template<typename T1>
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arma_cold
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inline
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void
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op_reshape_old::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_reshape_old>& in)
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{
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arma_extra_debug_sigprint();
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const uword in_n_rows = in.aux_uword_a;
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const uword in_n_cols = in.aux_uword_b;
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const uword in_dim = in.aux_uword_c;
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if(in_dim == 0)
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{
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out = reshape(in.m, in_n_rows, in_n_cols);
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}
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else
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if(in_dim == 1)
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{
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const unwrap<T1> U(in.m);
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out = reshape(strans(U.M), in_n_rows, in_n_cols);
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}
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}
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//! @}
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