On Monday 16 March 2009 02:51:30 pm Joel B. Mohler 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? > > Now, the fact that the "integrate(1)" hangs maxima is probably a bug all > it's own.
Sorry for the self reply, amend that second example to clarify my intent: sage: f=1 sage: # many lines of code sage: integrate(f) # what does this mean? ... sage: integrate(f,x) x Perhaps I should also say that I actually found the original versions of plot outright confusing because I *didn't* have to specify the variable. Mathematically, it's supposed to be a dummy variable so it should have to be specified. Maybe I'm just silly and pedantic, but the fact that it automatically "dummified" my variable confused me. I do realized that these things can be done in a well-defined way, but the fact that the 0 variable case was (and is) a source of bugs leads me to believe that no one really understood this at the start and that didn't give me confidence in the design. But I think the decision is already made so I apologize for the dead-horse beating. My only motivation was to answer the question about why it's deprecated (from my point of view, which may be totally weird). -- Joel --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
