On Sep 28, 2009, at 11:30 AM, Tim Lahey 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.
My impression was that most people preferred the diff(...) notation
(with partials in latex typesetting), at least where it makes sense,
but no one's finished implementing/reviewing it yet.
- Robert
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