Comment #1 on issue 3099 by ronan.l...@gmail.com: bin/test sympy/core is very slow
http://code.google.com/p/sympy/issues/detail?id=3099
c1440868c545d2d43b789b48858de0f1b4d70c22 is the first bad commit commit c1440868c545d2d43b789b48858de0f1b4d70c22 Author: Chris Smith <smi...@gmail.com> Date: Wed Feb 22 19:58:52 2012 +0545 add judicious numerical testing to is_constant and equals The _random method was added to expr to fascilitate testing. That routine is described by its docstring. The judiciousness of the new testing comes from using evalf to disprove (rather than prove) something is constant or that two expressions are equal. e.g. to disprove that something is constant, one need only substitute in two different values and see if they are different or not. If different, the expression cannot be constant. If the two values are the same, *or* if no significance could be obtained (because, perhaps, the expression is zero) then no conclusion is drawn. -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com. To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.