Dear Simon,
Thanks a lot for that! I haven't noticed the difference between
subs(locals()) and subs(globals()). This helps a lot.
Stan
On Aug 25, 1:13 pm, Simon King <[EMAIL PROTECTED]> wrote:
> Dear Stan
>
> On Aug 25, 11:59 am, Stan Schymanski <[EMAIL PROTECTED]> wrote:
>
> > I wondered how python handles assigned variables in function
> > definitions.
>
> As much as i understood a recent thread on sage-devel, several people
> would like to have a powerful substitution mechanism in Sage.
>
> Concerning your problem: In the definition of h, you use
> y.subs(locals()). But i think this can not work, because locals()
> refers to the current name space (or what is the word for it?). So,
> unless you define a and b *inside* the definition of h, it wouldn't
> work.
>
> However, you define a and b in the *global* name space. So, the
> following does work:
> sage: var('a b x')
> (a, b, x)
> sage: y=a*x^2+b*x
> sage: def h(x):
> ....: return y.subs(globals())
> ....:
> sage: h(x)
> a*x^2 + b*x
> sage: a=2
> sage: h(x)
> 2*x^2 + b*x
> sage: b=3
> sage: h(x)
> 2*x^2 + 3*x
>
> Cheers
> Simon
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/sage-support
URLs: http://www.sagemath.org
-~----------~----~----~----~------~----~------~--~---
