* these oopses for good, so we run those stupid tests... */
/*
- * GiNaC Copyright (C) 1999-2005 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2015 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "exams.h"
+#include "ginac.h"
+using namespace GiNaC;
+
+#include <iostream>
+using namespace std;
// The very first pair of historic problems had its roots in power.cpp and was
// finally resolved on April 27th 1999. (Fixing the first on April 23rd
ex e = ((-5-2*x)-((2-5*x)/(-2+x))*(3+2*x))/(5-4*x);
ex f = e.normal();
- ex d = (4+10*x+8*pow(x,2))/(x-2)/(5-4*x);
+ ex d = normal((4+10*x+8*pow(x,2))/(x-2)/(5-4*x));
if (!(f - d).expand().is_zero()) {
clog << "normal(" << e << ") returns " << f << " instead of " << d << endl;
return result;
}
+// Bug in reposition_dummy_indices() could result in correct expression
+// turned into one with inconsistent indices. Fixed on Aug 29, 2006
+static unsigned exam_paranoia17()
+{
+ varidx mu1(symbol("mu1"), 4);
+ varidx mu2(symbol("mu2"), 4);
+ varidx mu3(symbol("mu3"), 4);
+ varidx mu4(symbol("mu4"), 4);
+ varidx mu5(symbol("mu5"), 4);
+ varidx mu6(symbol("mu6"), 4);
+
+ exvector ev2;
+ ev2.push_back(mu3.toggle_variance());
+ ev2.push_back(mu6);
+ ev2.push_back(mu5.toggle_variance());
+ ev2.push_back(mu6.toggle_variance());
+ ev2.push_back(mu5);
+ ev2.push_back(mu3);
+ // notice: all indices are contracted ...
+
+ ex test_cycl = indexed(symbol("A"), sy_cycl(), ev2);
+ test_cycl = test_cycl.simplify_indexed();
+ // ... so there should be zero free indices in the end.
+ return test_cycl.get_free_indices().size();
+}
+
+// Bug in add::eval() could result in numeric terms not being collected into
+// the overall coefficient. Fixed on Sep 22, 2010
+static unsigned exam_paranoia18()
+{
+ ex sqrt2 = sqrt(ex(2));
+ ex e = 1+2*(sqrt2+1)*(sqrt2-1);
+ if ( e.real_part() != 3 ) {
+ clog << "real_part(1+2*(sqrt(2)+1)*(sqrt(2)-1)) failed to evaluate to 3\n";
+ return 1;
+ }
+ return 0;
+}
+
+// Bug in mul::conjugate when factors are evaluated at branch cuts, reported as
+// Sage bug #10964.
+static unsigned exam_paranoia19()
+{
+ symbol a("a");
+ ex e = conjugate(a*sqrt(ex(-2))*sqrt(ex(-3)));
+ ex c = a*conjugate(sqrt(ex(-2)))*conjugate(sqrt(ex(-3)));
+ if (!subs(e-c, a==42).is_zero()) {
+ clog << "subs(a*conjugate(sqrt(-2))*conjugate(sqrt(-3))-conjugate(a*sqrt(-2)*sqrt(-3)),a==42) failed to evaluate to 0\n";
+ return 1;
+ }
+ return 0;
+}
+
+// Bugs in is_polynomial (fixed 2011-05-20 and 2014-07-26).
+static unsigned exam_paranoia20()
+{
+ unsigned result = 0;
+ symbol x("x"), y("y");
+ ex e1 = sqrt(x*x+1)*sqrt(x+1);
+ if (e1.is_polynomial(x)) {
+ clog << "sqrt(x*x+1)*sqrt(x+1) is wrongly reported to be a polynomial in x\n";
+ ++result;
+ }
+ ex e2 = sqrt(Pi)*x;
+ if (!e2.is_polynomial(x)) {
+ clog << "sqrt(Pi)*x is wrongly reported to be no polynomial in x\n";
+ ++result;
+ }
+ ex e3 = sqrt(x);
+ if (!e3.is_polynomial(y)) {
+ clog << "sqrt(x) is wrongly reported to be no polynomial in y\n";
+ ++result;
+ }
+ ex e4 = (1+y)/(2+x);
+ if (e4.is_polynomial(x)) {
+ clog << "(1+y)/(2+x) is wrongly reported to be a polynomial in x\n";
+ ++result;
+ }
+ return result;
+}
+
+static unsigned is_polynomial_false_positive()
+{
+ unsigned result = 0;
+ symbol x("x"), n("n");
+ exvector nonpoly_exprs;
+ nonpoly_exprs.push_back(1/(1-x));
+ nonpoly_exprs.push_back(1/(x+1));
+ nonpoly_exprs.push_back(-1/(x-1));
+ nonpoly_exprs.push_back(1/(1-x*x));
+ nonpoly_exprs.push_back(1/(1-pow(x,n)));
+ nonpoly_exprs.push_back(x-1/(x-1));
+ for (exvector::const_iterator ep = nonpoly_exprs.begin();
+ ep != nonpoly_exprs.end(); ++ep) {
+ if (ep->is_polynomial(x)) {
+ clog << "(" << *ep << ").is_polynomial(" << x << ") "
+ "erroneously returned true" << endl;
+ ++result;
+ }
+ }
+ return result;
+}
+
+// Bug in power::expand reported by Isuru Fernando (fixed 2015-05-07).
+static unsigned exam_paranoia21()
+{
+ symbol x("x");
+ ex e = pow(x + sqrt(ex(2))*x, 2).expand();
+ if (e.nops() != 2) {
+ clog << "(x+sqrt(2)*x)^2 was wrongly expanded to " << e << "\n";
+ return 1;
+ }
+ return 0;
+}
+
unsigned exam_paranoia()
{
unsigned result = 0;
cout << "examining several historic failures just out of paranoia" << flush;
- clog << "----------several historic failures:" << endl;
result += exam_paranoia1(); cout << '.' << flush;
result += exam_paranoia2(); cout << '.' << flush;
result += exam_paranoia14(); cout << '.' << flush;
result += exam_paranoia15(); cout << '.' << flush;
result += exam_paranoia16(); cout << '.' << flush;
-
- if (!result) {
- cout << " passed " << endl;
- clog << "(no output)" << endl;
- } else {
- cout << " failed " << endl;
- }
+ result += exam_paranoia17(); cout << '.' << flush;
+ result += exam_paranoia18(); cout << '.' << flush;
+ result += exam_paranoia19(); cout << '.' << flush;
+ result += exam_paranoia20(); cout << '.' << flush;
+ result += is_polynomial_false_positive(); cout << '.' << flush;
+ result += exam_paranoia21(); cout << '.' << flush;
return result;
}
+
+int main(int argc, char** argv)
+{
+ return exam_paranoia();
+}
git://www.ginac.de / ginac.git / blobdiff