Burcin Erocal wrote: > On Fri, 7 Nov 2008 03:26:35 -0800 > "Mike Hansen" <[EMAIL PROTECTED]> wrote: > >> On Fri, Nov 7, 2008 at 3:14 AM, Jason Grout >> <[EMAIL PROTECTED]> wrote: >>>> plot( f(x=5), (y, -10,10)) >>>> >>>> plot( f(x=5,y=y), (y, -10,10)) >>>> >>>> plot( f(5,None), (y, -10,10)) >>>> >>>> plot( f(5,y), (y, -10,10)) >>>> >>>> g(y) = f(5,y) >>>> plot(g, (y, -10,10)) >>>> That last one seemed too verbose >>> >>> I guess you could also do: >>> >>> plot( lambda y: f(5,y), (y, -10,10)) >>> >>> but then you give up things like fast_float. >> You didn't mention >> >> plot(f(5,y).function(y), (y, -10,10)) >> >> which is the one that'd be compatible with non-callable expressions. > > If symbolic expressions cease to be callable, plot would need to be > changed to handle these cases: > > sage: plot( x^2 ) > > This seems plausible, since at the moment we allow > > sage: plot( sin ) > > for usability. > > > Going back to your example, f(5,y) would just return a symbolic > expression, so > > sage: f(x,y)=2*x+3*y > sage: plot( f(5,y), (y, -10,10)) > > would be equivalent to > > sage: plot( 10+3*y, (y, -10,10)) > > which would just work. > > > The current syntax allows this: > > sage: f(x,y) = a*x + b*y > sage: f(5) > b*y + 5*a > sage: f(5)(5) > b*y + 25 > > > I think the last line should be a syntax error.
I agree, since f was explicitly defined with variables x and y. f(5) should return a function g(y) = b*y+5*a I think this could be easily changed (just return a function that has explicit variables, rather than just a symbolic expression). Jason --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
