ldsb.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christopher Mears <chris.mears@monash.edu>
*
* Copyright:
* Christopher Mears, 2012
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
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namespace Gecode {
template<class A>
SymmetryHandle
rows_interchange(const Matrix<A>& m) {
typename Matrix<A>::ArgsType xs;
for (int r = 0 ; r < m.height() ; r++)
xs << m.row(r);
return VariableSequenceSymmetry(xs, m.width());
}
template<class A>
SymmetryHandle
columns_interchange(const Matrix<A>& m) {
typename Matrix<A>::ArgsType xs;
for (int c = 0 ; c < m.width() ; c++)
xs << m.col(c);
return VariableSequenceSymmetry(xs, m.height());
}
template<class A>
SymmetryHandle
rows_reflect(const Matrix<A>& m) {
int nrows = m.height();
int ncols = m.width();
// Length of each sequence in the symmetry.
int length = (nrows/2) * ncols;
typename Matrix<A>::ArgsType xs(length * 2);
for (int i = 0 ; i < length ; i++) {
// Break position i into its coordinates
int r1 = i/ncols;
int c1 = i%ncols;
// r2 is the row symmetric with r1
int r2 = nrows - r1 - 1;
// The column remains the same
int c2 = c1;
xs[i] = m(c1,r1);
xs[length+i] = m(c2,r2);
}
return VariableSequenceSymmetry(xs, length);
}
template<class A>
SymmetryHandle columns_reflect(const Matrix<A>& m) {
int nrows = m.height();
int ncols = m.width();
// Length of each sequence in the symmetry.
int length = (ncols/2) * nrows;
typename Matrix<A>::ArgsType xs(length * 2);
for (int i = 0 ; i < length ; i++) {
// Break position i into its coordinates
int r1 = i/ncols;
int c1 = i%ncols;
// c2 is the column symmetric with c1
int c2 = ncols - c1 - 1;
// The row remains the same
int r2 = r1;
xs[i] = m(c1,r1);
xs[length+i] = m(c2,r2);
}
return VariableSequenceSymmetry(xs, length);
}
template<class A>
SymmetryHandle diagonal_reflect(const Matrix<A>& m) {
int nrows = m.height();
int ncols = m.width();
typename Matrix<A>::ArgsType a1;
typename Matrix<A>::ArgsType a2;
for (int i = 0 ; i < nrows ; i++) {
for (int j = i+1 ; j < ncols ; j++) {
a1 << m(j,i);
a2 << m(i,j);
}
}
typename Matrix<A>::ArgsType aboth;
aboth << a1;
aboth << a2;
return VariableSequenceSymmetry(aboth, a1.size());
}
}
// STATISTICS: minimodel-any
Gecode::Matrix::width
int width(void) const
Return the width of the matrix.
Definition matrix.hpp:143
Gecode::Matrix::col
Slice< A > col(int c) const
Access column c.
Definition matrix.hpp:183
Gecode::Matrix::row
Slice< A > row(int r) const
Access row r.
Definition matrix.hpp:177
Gecode::Matrix::Matrix
Matrix(A a, int w, int h)
Basic constructor.
Definition matrix.hpp:127
Gecode::Matrix::ArgsType
ArrayTraits< A >::ArgsType ArgsType
The type of the Args-array type for ValueType values.
Definition minimodel.hh:2166
Gecode::Matrix::height
int height(void) const
Return the height of the matrix.
Definition matrix.hpp:146
Gecode::SymmetryHandle
A reference-counted pointer to a SymmetryObject.
Definition int.hh:5255
Gecode
Gecode toplevel namespace
Gecode::rows_reflect
SymmetryHandle rows_reflect(const Matrix< A > &m)
Reflect rows symmetry specification.
Definition ldsb.hpp:62
Gecode::columns_reflect
SymmetryHandle columns_reflect(const Matrix< A > &m)
Reflect columns symmetry specification.
Definition ldsb.hpp:85
Gecode::rows_interchange
SymmetryHandle rows_interchange(const Matrix< A > &m)
Interchangeable rows symmetry specification.
Definition ldsb.hpp:40
Gecode::VariableSequenceSymmetry
SymmetryHandle VariableSequenceSymmetry(const IntVarArgs &x, int ss)
Variable sequences in x of size ss are interchangeable.
Definition ldsb.cpp:90
Gecode::diagonal_reflect
SymmetryHandle diagonal_reflect(const Matrix< A > &m)
Reflect around main diagonal symmetry specification.
Definition ldsb.hpp:108
Gecode::columns_interchange
SymmetryHandle columns_interchange(const Matrix< A > &m)
Interchangeable columns symmetry specification.
Definition ldsb.hpp:51