+/** @file time_lw_G.cpp
+ *
+ * Test G from the paper "Comparison of Polynomial-Oriented CAS" by Robert H.
+ * Lewis and Michael Wester. */
+
+/*
+ * GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "times.h"
+
+static unsigned test(void)
+{
+ symbol x("x");
+ symbol y("y");
+ symbol z("z");
+
+ ex p = expand(pow(7*y*pow(x*z,2)-3*x*y*z+11*(x+1)*pow(y,2)+5*z+1,4)
+ *pow(3*x-7*y+2*z-3,5));
+ ex q = expand(pow(7*y*pow(x*z,2)-3*x*y*z+11*(x+1)*pow(y,2)+5*z+1,3)
+ *pow(3*x-7*y+2*z+3,6));
+ ex result = gcd(p,q);
+ if (result.expand()!=expand(pow(7*y*pow(x*z,2)-3*x*y*z+11*(x+1)*pow(y,2)+5*z+1,3))) {
+ clog << "gcd(expand((7*y*x^2*z^2-3*x*y*z+11*(x+1)*y^2+5*z+1)^4*(3*x-7*y+2*z-3)^5),expand((7*y*x^2*z^2-3*x*y*z+11*(x+1)*y^2+5*z+1)^3*(3*x-7*y+2*z+3)^6)) erroneously returned " << result << endl;
+ return 1;
+ }
+ return 0;
+}
+
+unsigned time_lw_G(void)
+{
+ unsigned result = 0;
+ unsigned count = 1;
+ timer rolex;
+ double time = .0;
+
+ cout << "timing Lewis-Wester test G (gcd of 3-var polys)" << flush;
+ clog << "-------Lewis-Wester test G (gcd of 3-var polys)" << endl;
+
+ rolex.start();
+ // correct for very small times:
+ do {
+ result = test();
+ ++count;
+ } while ((time=rolex.read())<0.1 && !result);
+ cout << '.' << flush;
+
+ if (!result) {
+ cout << " passed ";
+ clog << "(no output)" << endl;
+ } else {
+ cout << " failed ";
+ }
+ cout << int(1000*(time/count))*0.001 << 's' << endl;
+
+ return result;
+}