1 /** @file time_lw_Q.cpp
3 * Test Q from the paper "Comparison of Polynomial-Oriented CAS" by Robert H.
4 * Lewis and Michael Wester. */
7 * GiNaC Copyright (C) 1999-2024 Johannes Gutenberg University Mainz, Germany
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 using namespace GiNaC;
32 const bool do_test = true; // set to true in order to run this beast
34 static unsigned test()
36 // same matrix as in test P:
37 const unsigned n = 10;
38 matrix m(n*n+1,n*n+1);
39 for (unsigned i=1; i<=n*n; ++i)
41 for (unsigned i=1; i<=n*n; ++i)
44 for (unsigned i=1; i<=n*n; ++i)
46 m.set(n*n,i-1,n-(i-1)/n);
47 for(unsigned i=1; i<=n; ++i)
48 for (unsigned j=1; j<=n; ++j)
50 for (unsigned k=1; k<n; ++k)
51 m.set((i-1)*n+k-1,(j-1)*n+k,n+1-j);
53 symbol lambda("lambda");
54 ex cp = m.charpoly(lambda);
56 if (cp.coeff(lambda,96) != numeric("75287520")) {
57 clog << "characteristic polynomial miscalculated as " << cp << endl;
70 cout << "timing Lewis-Wester test Q (charpoly(P))" << flush;
74 // correct for very small times:
78 } while ((time=rolex.read())<0.1 && !result);
80 cout << time/count << 's' << endl;
82 cout << " disabled" << endl;
88 extern void randomify_symbol_serials();
90 int main(int argc, char** argv)
92 randomify_symbol_serials();
93 cout << setprecision(2) << showpoint;