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<div class="title">examples/dot-product.C</div> </div>
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<p>Timings on dot products of random vectors. </p>
<dl class="author"><dt><b>Author:</b></dt><dd>Bradford Hovinen <<a href="mailto:hovinen@cis.udel.edu">hovinen@cis.udel.edu</a>></dd></dl>
<p>Use of vectors meeting the <a class="el" href="namespace_lin_box.html" title="Namespace in which all linbox code resides.">LinBox</a> dense and sparse vector archetypes is illustrated and their dot-product times are benchmarked.</p>
<p>Constructs random vectors and computes their dot product, giving the required time.</p>
<div class="fragment"><pre class="fragment"><span class="comment">/* -*- mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */</span>
<span class="comment">// vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s</span>
<span class="comment">/* -*- mode: C++; style: linux -*- */</span>
<span class="comment">/*</span>
<span class="comment"> * examples/dot-product.C</span>
<span class="comment"> *</span>
<span class="comment"> * Copyright (C) 2002, 2010 Bradford Hovinen <hovinen@cis.udel.edu></span>
<span class="comment"> *</span>
<span class="comment"> * This file is part of LinBox.</span>
<span class="comment"> *</span>
<span class="comment"> * LinBox is free software: you can redistribute it and/or modify</span>
<span class="comment"> * it under the terms of the GNU Lesser General Public License as</span>
<span class="comment"> * published by the Free Software Foundation, either version 2 of</span>
<span class="comment"> * the License, or (at your option) any later version.</span>
<span class="comment"> *</span>
<span class="comment"> * LinBox is distributed in the hope that it will be useful,</span>
<span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<span class="comment"> * GNU Lesser General Public License for more details.</span>
<span class="comment"> *</span>
<span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
<span class="comment"> * License along with LinBox. If not, see</span>
<span class="comment"> * <http://www.gnu.org/licenses/>.</span>
<span class="comment"> */</span>
<span class="preprocessor">#include "linbox/linbox-config.h"</span>
<span class="preprocessor">#include <iostream></span>
<span class="preprocessor">#include "<a class="code" href="field_2modular_8h.html" title="A Modular field is a representations of Z/mZ.">linbox/field/modular.h</a>"</span>
<span class="preprocessor">#include "linbox/vector/vector-domain.h"</span>
<span class="preprocessor">#include "<a class="code" href="stream_8h.html" title="Generation of sequences of random vectors.">linbox/vector/stream.h</a>"</span>
<span class="preprocessor">#include "<a class="code" href="commentator_8h.html" title="Reports information to the user.">linbox/util/commentator.h</a>"</span>
<span class="keyword">using namespace </span>LinBox;
<span class="keyword">typedef</span> <a name="_a0"></a><a class="code" href="class_lin_box_1_1_modular_3_01uint32__t_01_4.html" title="Specialization of class Modular for uint32_t element type.">Modular<uint32_t></a> <a class="code" href="class_lin_box_1_1_modular_3_01uint32__t_01_4.html" title="Specialization of class Modular for uint32_t element type.">Field</a>;
<span class="keywordtype">int</span> main (<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
{
<span class="comment">// Constants: we are working with an n x n matrix over GF(q)</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> n = 10000000;
<span class="keyword">const</span> <span class="keywordtype">double</span> p = .001;
<span class="keyword">const</span> <span class="keywordtype">int</span> q = 32749;
commentator.<a name="a1"></a>setMaxDepth (1);
commentator.<a name="a2"></a>setReportStream (std::cout);
<a class="code" href="class_lin_box_1_1_modular_3_01uint32__t_01_4.html" title="Specialization of class Modular for uint32_t element type.">Field</a> F (q);
<a name="_a3"></a><a class="code" href="class_lin_box_1_1_random_dense_stream.html" title="Random dense vector stream.">RandomDenseStream<Field, Vector<Field>::Dense</a>> factory1 (F, n);
<a name="_a4"></a><a class="code" href="class_lin_box_1_1_random_sparse_stream.html" title="Random sparse vector stream.">RandomSparseStream<Field, Vector<Field>::SparseSeq</a>> factory2 (F, p, n);
<a class="code" href="class_lin_box_1_1_random_sparse_stream.html" title="Random sparse vector stream.">RandomSparseStream<Field, Vector<Field>::SparsePar</a>> factory3 (F, p, n);
Vector<Field>::Dense v1 (n), v2 (n);
Vector<Field>::SparseSeq v3;
Vector<Field>::SparsePar v4;
factory1 >> v1 >> v2;
factory2 >> v3;
factory3 >> v4;
VectorDomain<Field> VD (F);
Field::Element res;
commentator.<a name="a5"></a><a class="code" href="class_lin_box_1_1_commentator.html#a9b3772c898bc20f270af8d75ddc62090" title="Start an activity.">start</a> (<span class="stringliteral">"dense/dense dot product (1)"</span>);
<span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 1; i++)
VD.dot (res, v1, v2);
commentator.<a name="a6"></a><a class="code" href="class_lin_box_1_1_commentator.html#a3a418a21b882e15baa44fe8bef7aca84" title="Stop an activity.">stop</a> (<span class="stringliteral">"done"</span>);
commentator.<a class="code" href="class_lin_box_1_1_commentator.html#a9b3772c898bc20f270af8d75ddc62090" title="Start an activity.">start</a> (<span class="stringliteral">"dense/sparse sequence dot product (1000)"</span>);
<span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 1000; i++)
VD.dot (res, v1, v3);
commentator.<a class="code" href="class_lin_box_1_1_commentator.html#a3a418a21b882e15baa44fe8bef7aca84" title="Stop an activity.">stop</a> (<span class="stringliteral">"done"</span>);
commentator.<a class="code" href="class_lin_box_1_1_commentator.html#a9b3772c898bc20f270af8d75ddc62090" title="Start an activity.">start</a> (<span class="stringliteral">"dense/sparse parallel dot product (1000)"</span>);
<span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 1000; i++)
VD.dot (res, v1, v4);
commentator.<a class="code" href="class_lin_box_1_1_commentator.html#a3a418a21b882e15baa44fe8bef7aca84" title="Stop an activity.">stop</a> (<span class="stringliteral">"done"</span>);
<span class="keywordflow">return</span> 0;
}
</pre></div> </div>
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