On Sep 28, 2009, at 2:21 PM, kcrisman wrote:
>
> Dear support (and/or Burcin),
>
> How does Sage/Pynac support derivatives evaluated at a point (or does
> it)? E.g.,
>
> sage: f = function('f',t)
> sage: h = f.diff(t,1)
> sage: h.subs(t=0)
> D[0](f)(0)
>
> But is this what we are looking for? Thanks for any clarification.
Based upon what I recall about the D notation, that's the derivative
of f(t) evaluated at t = 0. The f(0) tells where it's evaluated at and
the D[0] indicates that it's the derivative with respect to the first
argument. I hate the notation and the change to it is why I don't really
use Sage anymore. I find it difficult to parse, and I want notation I
can use with my committee and supervisor, but I seem to have lost that
argument.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey
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