#17445: Missing documentation of derivative operator/notation
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Reporter: schymans | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.5
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: schymans | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
Replying to [comment:18 schymans]:
> What is the point of having a notation for differentials of symbolic
functions, then? Should the first step not be to actually implement
differentiation of symbolic functions and then explain the notation in the
documentation of function?
It's already implemented, see [comment:16]. It's called
`FDerivativeOperator`. It may be worthwhile having a nicer interface.
Being able to write `D[0,1](f)` might be nice. See
[https://groups.google.com/d/msg/sage-devel/xBHw11qUARg/0eqj3eUFsFkJ sage-
devel:"D notation input for ODEs"], which has a short and (I think) fully
functional code snippet that implements it.
If you prefer inputting your derivatives with Leibnitz notation, you're
going to need temporary variables, and in that case it's already about a
efficient as you can get:
{{{
sage: f=sage.symbolic.function_factory.function('f')
sage: df=diff(f(x),x).operator()
sage: df
D[0](f)
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/17445#comment:19>
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