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<h1>random_numbers.cpp</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/*</span>
00002 <span class="comment"> PyEO</span>
00003 <span class="comment"></span>
00004 <span class="comment"> Copyright (C) 2003 Maarten Keijzer</span>
00005 <span class="comment"></span>
00006 <span class="comment"> This program is free software; you can redistribute it and/or modify</span>
00007 <span class="comment"> it under the terms of the GNU General Public License as published by</span>
00008 <span class="comment"> the Free Software Foundation; either version 2 of the License, or</span>
00009 <span class="comment"> (at your option) any later version.</span>
00010 <span class="comment"></span>
00011 <span class="comment"> This program is distributed in the hope that it will be useful,</span>
00012 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
00013 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
00014 <span class="comment"> GNU General Public License for more details.</span>
00015 <span class="comment"></span>
00016 <span class="comment"> You should have received a copy of the GNU General Public License</span>
00017 <span class="comment"> along with this program; if not, write to the Free Software</span>
00018 <span class="comment"> Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
00019 <span class="comment">*/</span>
00020
00021 <span class="preprocessor">#include &lt;utils/eoRNG.h&gt;</span>
00022 <span class="preprocessor">#include &lt;boost/python.hpp&gt;</span>
00023
00024 <span class="keyword">using</span> <span class="keyword">namespace </span>boost::python;
00025
00026 <span class="preprocessor">#include &lt;sstream&gt;</span>
00027 <span class="preprocessor">#include &lt;boost/python/detail/api_placeholder.hpp&gt;</span>
00028
00029 <span class="keyword">using</span> <span class="keyword">namespace </span>boost::python;
00030
00031 <span class="keyword">namespace </span>eo
00032 {
00033 <a class="code" href="classeo_rng.html">eoRng</a> rng(time(0));
00034 }
00035
00036 <a class="code" href="classeo_rng.html">eoRng</a>&amp; get_rng() { <span class="keywordflow">return</span> rng; }
00037 <span class="keywordtype">double</span> normal(<a class="code" href="classeo_rng.html">eoRng</a>&amp; rng) { <span class="keywordflow">return</span> rng.<a class="code" href="classeo_rng.html#a7">normal</a>(); }
00038
00039 std::string rng_to_string(<span class="keyword">const</span> <a class="code" href="classeo_rng.html">eoRng</a>&amp; _rng)
00040 {
00041 std::ostringstream os;
00042 _rng.<a class="code" href="classeo_rng.html#a16">printOn</a>(os);
00043 os &lt;&lt; std::ends;
00044 <span class="keywordflow">return</span> os.str();
00045 }
00046
00047
00048 <span class="keywordtype">void</span> rng_from_string(<a class="code" href="classeo_rng.html">eoRng</a>&amp; _rng, std::string s)
00049 {
00050 std::istringstream is(s);
00051 _rng.<a class="code" href="classeo_rng.html#a17">readFrom</a>(is);
00052 }
00053
00054 <span class="keyword">struct </span>RNG_pickle_suite : boost::python::pickle_suite
00055 {
00056 <span class="keyword">static</span>
00057 boost::python::tuple getstate(<span class="keyword">const</span> <a class="code" href="classeo_rng.html">eoRng</a>&amp; _rng)
00058 {
00059 <span class="keywordflow">return</span> boost::python::make_tuple(str(rng_to_string(_rng)));
00060 }
00061 <span class="keyword">static</span>
00062 <span class="keywordtype">void</span> setstate(<a class="code" href="classeo_rng.html">eoRng</a>&amp; _rng, boost::python::tuple pickled)
00063 {
00064 std::string state = extract&lt;std::string&gt;(pickled[0]);
00065 rng_from_string(_rng, state);
00066 }
00067 };
00068
00069 <span class="keywordtype">int</span> spin(<a class="code" href="classeo_rng.html">eoRng</a>&amp; _rng, numeric::array values, <span class="keywordtype">double</span> total)
00070 {
00071 <span class="keywordflow">if</span> (total == 0.0)
00072 {
00073 <span class="keywordtype">unsigned</span> sz = len(values);
00074 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; sz; ++i)
00075 {
00076 total += extract&lt;double&gt;(values[i]); <span class="comment">//extract?</span>
00077 }
00078 }
00079
00080 <span class="keywordtype">double</span> chance = _rng.<a class="code" href="classeo_rng.html#a4">uniform</a>() * total;
00081
00082 <span class="keywordtype">int</span> i = 0;
00083 <span class="keywordflow">while</span> (chance &gt;= 0.0)
00084 chance -= extract&lt;double&gt;(values[i++]);
00085
00086 <span class="keywordflow">return</span> --i;
00087 }
00088
00089 <span class="keywordtype">void</span> random_numbers()
00090 {
00091 class_&lt;eoRng, boost::noncopyable&gt;(<span class="stringliteral">"eoRng"</span>, init&lt;uint32_t&gt;())
00092 .def(<span class="stringliteral">"flip"</span>, &amp;eoRng::flip)
00093 .def(<span class="stringliteral">"random"</span>, &amp;eoRng::random)
00094 .def(<span class="stringliteral">"rand"</span>, &amp;eoRng::rand)
00095 .def(<span class="stringliteral">"rand_max"</span>, &amp;eoRng::rand_max)
00096 .def(<span class="stringliteral">"reseed"</span>, &amp;eoRng::reseed)
00097 .def(<span class="stringliteral">"uniform"</span>, &amp;eoRng::uniform)
00098 .def(<span class="stringliteral">"normal"</span>, normal)
00099 .def(<span class="stringliteral">"negexp"</span>, &amp;eoRng::negexp)
00100 .def(<span class="stringliteral">"to_string"</span>, rng_to_string)
00101 .def(<span class="stringliteral">"from_string"</span>, rng_from_string)
00102 .def(<span class="stringliteral">"roulette_wheel"</span>, spin)
00103 .def_pickle(RNG_pickle_suite())
00104 ;
00105
00106 def(<span class="stringliteral">"rng"</span>, get_rng, return_value_policy&lt;reference_existing_object&gt;());
00107 }
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