On Sep 28, 2:30 pm, Tim Lahey <tim.la...@gmail.com> wrote:
> 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.
Thanks - so it does mean what I thought it did. That is helpful.
- kcrisman
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