I'd like to reopen discussion of #2781, "bool() for SymbolicEquation should raise an error when it doesn't know the answer". Jason created a prototype patch to implement this, but gave up on it and closed the ticket when he was convinced that "this is not pythonic".
I like the "raise an exception" behavior, because it would eliminate questions asking why form1 and form2 below are different (from this sage-support thread http://groups.google.com/group/sage-support/browse_thread/thread/79d0d6d94cfe9526#). (I have seen this exact problem at least twice on sage-support.) What do you think? f(x)=x; def g(x): if (x>=0): return f(x) else: return f(-x); show(plot(g(x),(x,-1,1))) #form1 show(plot(g,-1,1)) #form2 Carl --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
