On Dec 17, 2007 5:32 AM, Joel B. Mohler <[EMAIL PROTECTED]> wrote: > > Hi, > > I don't think that the trac 1460 is really fixed. The bug just got moved > around. > http://trac.sagemath.org/sage_trac/ticket/1460 > > # sage 2.9 > sage: t=var('t') > sage: f=t*sin(0) > sage: float(f(1)) > # goes boom for a different reason than in 2.8.15
This is *not* a bug. The is by design. Since f has no variables it is no longer implicitly callable: sage: f.variables() () sage: f(1) .ValueError: the number of arguments must be less than or equal to 0 You will have to instead write: sage: f(t) = t*sin(0) sage: f(1) 0 or use sage: f=t*sin(0) sage: f(t=0) 0 This change was introduced because people often do the following by accident: sage: a = (sqrt(2) + 17)(x+2) sage: a sqrt(2) + 17 Of course, that the above doesn't give an error even in 2.9 is a bug! At least in most cases it works: sage: (SR(2) + 3)(x) <type 'exceptions.ValueError'>: the number of arguments must be less than or equal to 0 Also, this is a bug: sage: a = (I*17+3*5)(x+2) AttributeError: 'I_class' object has no attribute 'number_of_arguments' I want to emphasize that allowing sage: a = (sqrt(2) + 17)(x+2) and having it return sqrt(2) + 17 is *very* confusing to a lot of people. I witnessed this time after time after time when teaching a high school workshop using Sage this summer -- it was really striking how often this happened. I made trac #1554 about this: http://trac.sagemath.org/sage_trac/ticket/1554 Joel -- thanks for your feedback, and please comment on the remarks I make above! Maybe I'm just completely wrong?! -- William > > It seems the originally submitted patch by was has a doc-test testing this > very > thing, but the actual code in my newly upgraded 2.9 just has a bunch of > doc-strings that look like: > """ > EXAMPLES: > """ > with no examples! > > I'm not sure what went on beyond that. > > -- > Joel > > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ 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://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
