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88 lines
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<title>EO: eoSymMutate.cpp Source File</title>
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<a class="el" href="dir_000007.html">contrib</a> / <a class="el" href="dir_000008.html">mathsym</a> / <a class="el" href="dir_000018.html">eo_interface</a></div>
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<h1>eoSymMutate.cpp</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/* </span>
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00002 <span class="comment"> * Copyright (C) 2005 Maarten Keijzer</span>
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00003 <span class="comment"> *</span>
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00004 <span class="comment"> * This program is free software; you can redistribute it and/or modify</span>
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00005 <span class="comment"> * it under the terms of version 2 of the GNU General Public License as </span>
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00006 <span class="comment"> * published by the Free Software Foundation. </span>
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00007 <span class="comment"> *</span>
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00008 <span class="comment"> * This program is distributed in the hope that it will be useful,</span>
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00009 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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00010 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
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00011 <span class="comment"> * GNU General Public License for more details.</span>
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00012 <span class="comment"> *</span>
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00013 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
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00014 <span class="comment"> * along with this program; if not, write to the Free Software</span>
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00015 <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
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00016 <span class="comment"> */</span>
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00017
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00018 <span class="preprocessor">#include <eoSymMutate.h></span>
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00019 <span class="preprocessor">#include <FunDef.h></span>
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00020 <span class="preprocessor">#include <utils/eoRNG.h></span>
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00021
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00022 <span class="keyword">using</span> <span class="keyword">namespace </span>std;
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00023
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00024 std::pair<Sym, bool> do_mutate(Sym sym, <span class="keywordtype">double</span> p, <span class="keyword">const</span> LanguageTable& table) {
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00025
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00026 <span class="keywordtype">bool</span> changed = <span class="keyword">false</span>;
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00027 SymVec args = sym.args();
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00028 <span class="keywordflow">if</span> (rng.<a class="code" href="classeo_rng.html#a6">flip</a>(p)) {
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00029 token_t new_token = table.get_random_function(sym.token(), args.size());
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00030 <span class="keywordflow">if</span> (new_token != sym.token()) {
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00031 changed = <span class="keyword">true</span>;
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00032 sym = Sym(new_token, args);
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00033 }
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00034 }
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00035
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00036 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i < args.size(); ++i) {
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00037 std::pair<Sym,bool> r = do_mutate(args[i], p, table);
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00038 changed |= r.second;
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00039 <span class="keywordflow">if</span> (r.second)
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00040 args[i] = r.first;
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00041 }
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00042
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00043 <span class="keywordflow">if</span> (changed)
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00044 <span class="keywordflow">return</span> std::make_pair(Sym(sym.token(), args), <span class="keyword">true</span>);
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00045 <span class="comment">// else</span>
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00046 <span class="keywordflow">return</span> std::make_pair(sym, <span class="keyword">false</span>);
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00047 }
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00048
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00049
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00050 <span class="comment">// these two can (should?) move to an impl file</span>
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00051 <span class="keywordtype">bool</span> mutate(Sym& sym, <span class="keywordtype">double</span> p, <span class="keyword">const</span> LanguageTable& table) {
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00052 std::pair<Sym, bool> r = do_mutate(sym, p, table);
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00053 sym = r.first;
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00054 <span class="keywordflow">return</span> r.second;
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00055 }
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00056
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00057
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00058 <span class="keywordtype">bool</span> mutate_constants(Sym& sym, <span class="keywordtype">double</span> stdev) {
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00059 vector<double> values = get_constants(sym);
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00060
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00061 <span class="keywordflow">if</span> (values.empty()) {
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00062 <span class="keywordflow">return</span> <span class="keyword">false</span>;
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00063 }
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00064
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00065 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i < values.size(); ++i) {
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00066 values[i] += rng.<a class="code" href="classeo_rng.html#a7">normal</a>() * stdev;
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00067 }
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00068
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00069 sym = set_constants(sym, values);
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00070
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00071 <span class="keywordflow">return</span> <span class="keyword">true</span>;
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00072 }
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00073
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</pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Oct 19 05:06:39 2006 for EO by
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.3.9.1 </small></address>
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