On Mon, Mar 16, 2009 at 11:51 AM, Joel B. Mohler <j...@kiwistrawberry.us> wrote: > > On Monday 16 March 2009 12:27:10 pm kcrisman wrote: >> sage: integrate(y^2) >> --------------------------------------------------------------------------- >> TypeError Traceback (most recent call >> last) >> TypeError: cannot coerce type '<type >> 'sage.symbolic.expression.Expression'>' into a SymbolicExpression. >> >> Of course, the current error is because we haven't done the switch to >> Pynac for everything yet. Why this would not still be valid input (to >> echo Ronan) after the switch is mystifying to me - again, or perhaps I >> have misinterpreted the deprecation proposal. > > Here's my reason for wanting it deprecated. It's fragile in the face of > unexpected input (I don't like being lulled into a false sense that my code > works when suddenly it wouldn't work for a constant input): > > sage: f=x > sage: # many lines of code > sage: integrate(f) > x^2/2 > > sage: f=1 > sage: # many lines of code > sage: integrate(f) # what does this mean? > ... hangs maxima ... > sage: integrate(f,x) # what does this mean?
This seems like an excellent reason to deprecate integrate(SYMBOLIC_EXPR), and I would vote in favor of doing so, but my patch won't do it. (My patch is about deprecating __call__, and things that invoke __call__ or the equivalent; symbolic integration doesn't call the expression.) Note that plot(1, (5, 7)) and numerical_integral(1, (5, 7)) don't have the same problem, and I'm currently not planning to deprecate them. (It's not always entirely clear who was agreeing to what proposal, but I get the impression that this is a compromise everybody can live with.) Carl --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
