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git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@40 331e1502-861f-0410-8da2-ba01fb791d7f
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legrand 2006-12-12 14:49:08 +00:00
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trunk/paradiseo-eo/contrib/mathsym/eo_interface/eoSymCrossover.cpp Normal file
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/*
* Copyright (C) 2005 Maarten Keijzer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <Sym.h>
#include <NodeSelector.h>
#include <eoSymCrossover.h>
#include <utils/eoRNG.h>
bool subtree_quad(Sym& a, Sym& b, NodeSelector& select) {
NodeSelector::NodeSelection sel_a = select.select_node(a);
NodeSelector::NodeSelection sel_b = select.select_node(b);
Sym aprime = insert_subtree(a, sel_a.idx(), sel_b.subtree() );
Sym bprime = insert_subtree(b, sel_b.idx(), sel_a.subtree() );
a = aprime;
b = bprime;
return true;
}
bool subtree_bin(Sym& a, const Sym& b, NodeSelector& select) {
NodeSelector::NodeSelection sel_a = select.select_node(a);
NodeSelector::NodeSelection sel_b = select.select_node(b);
a = insert_subtree(a, sel_a.idx(), sel_b.subtree());
return true;
}
Sym homologous_binimpl(Sym a, Sym b) {
if(a == b) { return a; } // no point
bool use_a = rng.random(2);
token_t head = (use_a? a : b).token();
SymVec args = use_a?a.args() : b.args();
const SymVec& a_args = a.args();
const SymVec& b_args = b.args();
unsigned mn = std::min(a_args.size(), b_args.size());
bool changed = !use_a;
for (unsigned i = 0; i < mn; ++i) {
args[i] = homologous_binimpl(a_args[i], b_args[i]);
if (args[i] != a_args[i]) {
changed = true;
}
}
return changed? Sym(head, args) : a;
}
bool homologous_bin(Sym& a, const Sym& b) {
if (a==b) return false;
Sym org = a;
a = homologous_binimpl(a,b);
return org != a;
}