Jip J. Dekker
2572df0663
git-subtree-dir: software/gecode_base git-subtree-split: bbefcea214fec798a0f5acc442581984555acd21
130 lines
3.9 KiB
C++
130 lines
3.9 KiB
C++
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Christopher Mears <chris.mears@monash.edu>
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*
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* Copyright:
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* Christopher Mears, 2012
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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namespace Gecode {
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/** \brief Interchangeable rows symmetry specification.
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*/
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template<class A>
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SymmetryHandle
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rows_interchange(const Matrix<A>& m) {
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typename Matrix<A>::ArgsType xs;
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for (int r = 0 ; r < m.height() ; r++)
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xs << m.row(r);
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return VariableSequenceSymmetry(xs, m.width());
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}
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/** \brief Interchangeable columns symmetry specification.
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*/
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template<class A>
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SymmetryHandle
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columns_interchange(const Matrix<A>& m) {
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typename Matrix<A>::ArgsType xs;
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for (int c = 0 ; c < m.width() ; c++)
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xs << m.col(c);
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return VariableSequenceSymmetry(xs, m.height());
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}
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/** \brief Reflect rows symmetry specification.
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*/
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template<class A>
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SymmetryHandle
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rows_reflect(const Matrix<A>& m) {
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int nrows = m.height();
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int ncols = m.width();
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// Length of each sequence in the symmetry.
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int length = (nrows/2) * ncols;
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typename Matrix<A>::ArgsType xs(length * 2);
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for (int i = 0 ; i < length ; i++) {
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// Break position i into its coordinates
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int r1 = i/ncols;
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int c1 = i%ncols;
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// r2 is the row symmetric with r1
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int r2 = nrows - r1 - 1;
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// The column remains the same
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int c2 = c1;
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xs[i] = m(c1,r1);
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xs[length+i] = m(c2,r2);
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}
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return VariableSequenceSymmetry(xs, length);
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}
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/** \brief Reflect columns symmetry specification.
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*/
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template<class A>
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SymmetryHandle columns_reflect(const Matrix<A>& m) {
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int nrows = m.height();
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int ncols = m.width();
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// Length of each sequence in the symmetry.
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int length = (ncols/2) * nrows;
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typename Matrix<A>::ArgsType xs(length * 2);
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for (int i = 0 ; i < length ; i++) {
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// Break position i into its coordinates
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int r1 = i/ncols;
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int c1 = i%ncols;
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// c2 is the column symmetric with c1
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int c2 = ncols - c1 - 1;
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// The row remains the same
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int r2 = r1;
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xs[i] = m(c1,r1);
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xs[length+i] = m(c2,r2);
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}
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return VariableSequenceSymmetry(xs, length);
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}
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/** \brief Reflect around main diagonal symmetry specification.
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*/
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template<class A>
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SymmetryHandle diagonal_reflect(const Matrix<A>& m) {
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int nrows = m.height();
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int ncols = m.width();
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typename Matrix<A>::ArgsType a1;
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typename Matrix<A>::ArgsType a2;
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for (int i = 0 ; i < nrows ; i++) {
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for (int j = i+1 ; j < ncols ; j++) {
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a1 << m(j,i);
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a2 << m(i,j);
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}
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}
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typename Matrix<A>::ArgsType aboth;
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aboth << a1;
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aboth << a2;
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return VariableSequenceSymmetry(aboth, a1.size());
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}
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}
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// STATISTICS: minimodel-any
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