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<a class="el" href="dir_000007.html">contrib</a>&nbsp;/&nbsp;<a class="el" href="dir_000008.html">mathsym</a>&nbsp;/&nbsp;<a class="el" href="dir_000018.html">eo_interface</a></div>
<h1>eoSymCrossover.cpp</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/* </span>
00002 <span class="comment"> * Copyright (C) 2005 Maarten Keijzer</span>
00003 <span class="comment"> *</span>
00004 <span class="comment"> * This program is free software; you can redistribute it and/or modify</span>
00005 <span class="comment"> * it under the terms of version 2 of the GNU General Public License as </span>
00006 <span class="comment"> * published by the Free Software Foundation. </span>
00007 <span class="comment"> *</span>
00008 <span class="comment"> * This program is distributed in the hope that it will be useful,</span>
00009 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
00010 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
00011 <span class="comment"> * GNU General Public License for more details.</span>
00012 <span class="comment"> *</span>
00013 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
00014 <span class="comment"> * along with this program; if not, write to the Free Software</span>
00015 <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
00016 <span class="comment"> */</span>
00017
00018
00019 <span class="preprocessor">#include &lt;Sym.h&gt;</span>
00020 <span class="preprocessor">#include &lt;NodeSelector.h&gt;</span>
00021
00022 <span class="preprocessor">#include &lt;eoSymCrossover.h&gt;</span>
00023 <span class="preprocessor">#include &lt;utils/eoRNG.h&gt;</span>
00024
00025 <span class="keywordtype">bool</span> subtree_quad(Sym&amp; a, Sym&amp; b, <a class="code" href="class_node_selector.html">NodeSelector</a>&amp; select) {
00026 NodeSelector::NodeSelection sel_a = select.<a class="code" href="class_node_selector.html#a1">select_node</a>(a);
00027 NodeSelector::NodeSelection sel_b = select.<a class="code" href="class_node_selector.html#a1">select_node</a>(b);
00028
00029 Sym aprime = insert_subtree(a, sel_a.idx(), sel_b.subtree() );
00030 Sym bprime = insert_subtree(b, sel_b.idx(), sel_a.subtree() );
00031
00032 a = aprime;
00033 b = bprime;
00034 <span class="keywordflow">return</span> <span class="keyword">true</span>;
00035 }
00036
00037 <span class="keywordtype">bool</span> subtree_bin(Sym&amp; a, <span class="keyword">const</span> Sym&amp; b, <a class="code" href="class_node_selector.html">NodeSelector</a>&amp; select) {
00038 NodeSelector::NodeSelection sel_a = select.<a class="code" href="class_node_selector.html#a1">select_node</a>(a);
00039 NodeSelector::NodeSelection sel_b = select.<a class="code" href="class_node_selector.html#a1">select_node</a>(b);
00040
00041 a = insert_subtree(a, sel_a.idx(), sel_b.subtree());
00042
00043 <span class="keywordflow">return</span> <span class="keyword">true</span>;
00044 }
00045
00046 Sym homologous_binimpl(Sym a, Sym b) {
00047
00048 <span class="keywordflow">if</span>(a == b) { <span class="keywordflow">return</span> a; } <span class="comment">// no point </span>
00049
00050 <span class="keywordtype">bool</span> use_a = rng.<a class="code" href="classeo_rng.html#a5">random</a>(2);
00051
00052 token_t head = (use_a? a : b).token();
00053 SymVec args = use_a?a.args() : b.args();
00054
00055 <span class="keyword">const</span> SymVec&amp; a_args = a.args();
00056 <span class="keyword">const</span> SymVec&amp; b_args = b.args();
00057 <span class="keywordtype">unsigned</span> mn = std::min(a_args.size(), b_args.size());
00058
00059 <span class="keywordtype">bool</span> changed = !use_a;
00060
00061 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; mn; ++i) {
00062 args[i] = homologous_binimpl(a_args[i], b_args[i]);
00063 <span class="keywordflow">if</span> (args[i] != a_args[i]) {
00064 changed = <span class="keyword">true</span>;
00065 }
00066 }
00067
00068 <span class="keywordflow">return</span> changed? Sym(head, args) : a;
00069 }
00070
00071 <span class="keywordtype">bool</span> homologous_bin(Sym&amp; a, <span class="keyword">const</span> Sym&amp; b) {
00072 <span class="keywordflow">if</span> (a==b) <span class="keywordflow">return</span> <span class="keyword">false</span>;
00073 Sym org = a;
00074 a = homologous_binimpl(a,b);
00075 <span class="keywordflow">return</span> org != a;
00076 }
00077
00078
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Oct 19 05:06:38 2006 for EO by&nbsp;
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