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<div class="title">examples/valence.C</div> </div>
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<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">/*</span>
<span class="comment"> * examples/valence.C</span>
<span class="comment"> *</span>
<span class="comment"> * Copyright (C) 2005, 2010 J-G Dumas</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="comment">//#include "linbox-config.h"</span>
<span class="preprocessor">#include <iostream></span>
<span class="preprocessor">#include "<a class="code" href="modular-double_8h.html" title="Standard representation of Z/mZ over double .">linbox/field/modular-double.h</a>"</span>
<span class="preprocessor">#include "linbox/blackbox/transpose.h"</span>
<span class="preprocessor">#include "linbox/blackbox/compose.h"</span>
<span class="preprocessor">#include "linbox/blackbox/sparse.h"</span>
<span class="preprocessor">#include "linbox/solutions/valence.h"</span>
<span class="preprocessor">#include "linbox/util/matrix-stream.h"</span>
<span class="keyword">using namespace </span>LinBox;
<span class="keywordtype">int</span> main (<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
{
commentator.<a name="a0"></a>setMaxDetailLevel (-1);
commentator.<a name="a1"></a>setMaxDepth (-1);
commentator.<a name="a2"></a>setReportStream (std::cerr);
<span class="keywordflow">if</span> (argc < 2 || argc > 3) {
std::cerr << <span class="stringliteral">"Usage: valence <matrix-file-in-supported-format> [-ata|-aat]"</span> << std::endl;
<span class="keywordflow">return</span> -1;
}
std::ifstream input (argv[1]);
<span class="keywordflow">if</span> (!input) { std::cerr << <span class="stringliteral">"Error opening matrix file "</span> << argv[1] << std::endl; <span class="keywordflow">return</span> -1; }
<a name="_a3"></a><a class="code" href="class_lin_box_1_1_p_i_d__integer.html" title="Domain for integer operations.">PID_integer</a> ZZ;
<a name="_a4"></a><a class="code" href="class_lin_box_1_1_matrix_stream.html" title="MatrixStream.">MatrixStream< PID_integer ></a> ms( ZZ, input );
<span class="keyword">typedef</span> <a name="_a5"></a><a class="code" href="class_lin_box_1_1_sparse_matrix.html" title="vector of sparse rows.">SparseMatrix<PID_integer></a> Blackbox;
Blackbox A (ms);
std::cout << <span class="stringliteral">"A is "</span> << A.rowdim() << <span class="stringliteral">" by "</span> << A.coldim() << std::endl;
PID_integer::Element val_A;
<span class="keywordflow">if</span> (argc == 3) {
<a name="_a6"></a><a class="code" href="class_lin_box_1_1_transpose.html" title="transpose matrix without copying.">Transpose<Blackbox></a> T(&A);
<span class="keywordflow">if</span> (strcmp(argv[2],<span class="stringliteral">"-aat"</span>)) {
<a name="_a7"></a><a class="code" href="class_lin_box_1_1_compose.html" title="Blackbox of a product: , i.e .">Compose< Transpose<Blackbox></a>, Blackbox > C (&T, &A);
std::cout << <span class="stringliteral">"A^T A is "</span> << C.<a name="a8"></a><a class="code" href="class_lin_box_1_1_compose.html#a09202c1aaa6c5a4c8e69a2339a27bcfe" title="The number of rows.">rowdim</a>() << <span class="stringliteral">" by "</span> << C.<a name="a9"></a><a class="code" href="class_lin_box_1_1_compose.html#a63d5df22c5024e979e3462155d0fe814" title="The number of columns.">coldim</a>() << std::endl;
valence(val_A, C);
}
<span class="keywordflow">else</span> {
<a class="code" href="class_lin_box_1_1_compose.html" title="Blackbox of a product: , i.e .">Compose< Blackbox, Transpose<Blackbox></a> > C (&A, &T);
std::cout << <span class="stringliteral">"A A^T is "</span> << C.<a name="a10"></a><a class="code" href="class_lin_box_1_1_compose.html#a09202c1aaa6c5a4c8e69a2339a27bcfe" title="The number of rows.">rowdim</a>() << <span class="stringliteral">" by "</span> << C.<a name="a11"></a><a class="code" href="class_lin_box_1_1_compose.html#a63d5df22c5024e979e3462155d0fe814" title="The number of columns.">coldim</a>() << std::endl;
valence(val_A, C);
}
}
<span class="keywordflow">else</span> {
<span class="keywordflow">if</span> (A.rowdim() != A.coldim()) {
std::cerr << <span class="stringliteral">"Valence works only on square matrices, try either to change the dimension in the matrix file, or to compute the valence of A A^T or A^T A, via the -aat or -ata options."</span> << std::endl;
exit(0);
}
<span class="keywordflow">else</span>
valence (val_A, A);
}
std::cout << <span class="stringliteral">"Valence is "</span> << val_A << std::endl;
<span class="keywordflow">return</span> 0;
}
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