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<h1>sample9.cpp</h1>Example demonstrates binary distance metrics.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="a00101.html#ga1">bm::count_and</a> <p>
<a class="el" href="a00101.html#ga2">bm::count_xor</a> <p>
<a class="el" href="a00101.html#ga3">bm::count_sub</a> <p>
<a class="el" href="a00101.html#ga4">bm::count_or</a> <p>
<a class="el" href="a00101.html#ga0">bm::distance_operation</a></dd></dl>
For more information please visit: <a href="http://bmagic.sourceforge.net">http://bmagic.sourceforge.net</a><p>
<div class="fragment"><pre class="fragment"><span class="comment">/*</span>
<span class="comment">Copyright(c) 2002-2005 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)</span>
<span class="comment"></span>
<span class="comment">Permission is hereby granted, free of charge, to any person </span>
<span class="comment">obtaining a copy of this software and associated documentation </span>
<span class="comment">files (the "Software"), to deal in the Software without restriction, </span>
<span class="comment">including without limitation the rights to use, copy, modify, merge, </span>
<span class="comment">publish, distribute, sublicense, and/or sell copies of the Software, </span>
<span class="comment">and to permit persons to whom the Software is furnished to do so, </span>
<span class="comment">subject to the following conditions:</span>
<span class="comment"></span>
<span class="comment">The above copyright notice and this permission notice shall be included </span>
<span class="comment">in all copies or substantial portions of the Software.</span>
<span class="comment"></span>
<span class="comment">THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, </span>
<span class="comment">EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES </span>
<span class="comment">OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. </span>
<span class="comment">IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, </span>
<span class="comment">DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, </span>
<span class="comment">ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR </span>
<span class="comment">OTHER DEALINGS IN THE SOFTWARE.</span>
<span class="comment">*/</span>
<span class="comment"></span>
<span class="comment">/** \example sample9.cpp</span>
<span class="comment"></span>
<span class="comment"> Example demonstrates binary distance metrics.</span>
<span class="comment"> </span>
<span class="comment"> \sa bm::count_and </span>
<span class="comment"> \sa bm::count_xor</span>
<span class="comment"> \sa bm::count_sub</span>
<span class="comment"> \sa bm::count_or</span>
<span class="comment"> \sa bm::distance_operation</span>
<span class="comment"></span>
<span class="comment"> For more information please visit: http://bmagic.sourceforge.net</span>
<span class="comment"></span>
<span class="comment">*/</span>
<span class="preprocessor">#include <iostream></span>
<span class="preprocessor">#include "<a class="code" href="a00074.html">bm.h</a>"</span>
<span class="preprocessor">#include "<a class="code" href="a00075.html">bmalgo.h</a>"</span>
<span class="keyword">using</span> <span class="keyword">namespace </span>std;
<span class="keywordtype">int</span> <a name="a59"></a><a class="code" href="a00083.html#a0">main</a>(<span class="keywordtype">void</span>)
{
<a name="_a60"></a><a class="code" href="a00048.html">bm::bvector<></a> bv1;
<a class="code" href="a00048.html">bm::bvector<></a> bv2;
bv1[10] = <span class="keyword">true</span>;
bv1[100] = <span class="keyword">true</span>;
bv1[10000] = <span class="keyword">true</span>;
bv2[10] = <span class="keyword">true</span>;
bv2[100] = <span class="keyword">true</span>;
bv2[20000] = <span class="keyword">true</span>;
bv2[30000] = <span class="keyword">true</span>;
<span class="comment">// Hamming distance: </span>
<span class="keywordtype">unsigned</span> hamming = <a name="a61"></a><a class="code" href="a00101.html#ga2">bm::count_xor</a>(bv1, bv2);
cout << <span class="stringliteral">"Hamming distance = "</span> << hamming << endl;
<span class="comment">// Dice distance using basic distance functions</span>
<span class="keywordtype">double</span> dice =
double(2 * bm::count_and(bv1, bv2))/double(bv1.<a name="a62"></a><a class="code" href="a00048.html#a26">count</a>() + bv2.<a class="code" href="a00048.html#a26">count</a>());
cout << <span class="stringliteral">"Dice distance = "</span> << dice << endl;
<span class="comment">// Dice distance, can be computed using "metric pipeline"</span>
<a name="_a63"></a><a class="code" href="a00065.html">bm::distance_metric_descriptor</a> dmd[3];
dmd[0].<a name="a64"></a><a class="code" href="a00065.html#o0">metric</a> = bm::COUNT_AND;
dmd[1].<a class="code" href="a00065.html#o0">metric</a> = bm::COUNT_A;
dmd[2].<a class="code" href="a00065.html#o0">metric</a> = bm::COUNT_B;
<a name="a65"></a><a class="code" href="a00101.html#ga0">bm::distance_operation</a>(bv1, bv2, dmd, dmd+3);
<span class="keywordtype">double</span> dice_p =
double(2 * dmd[0].result) / double(dmd[1].result + dmd[2].result);
cout << <span class="stringliteral">"Dice distance (pipeline) = "</span> << dice_p << endl;
<span class="keywordflow">return</span> 0;
}
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