#17701: diff(f,t) should work even with Function objects
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Reporter: rws | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.8
Component: calculus | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/diff_f_t__should_work_even_with_function_objects|
0cecec3ff4c53e8e030311b4b55fc9e7d96a8cda
Dependencies: | Stopgaps:
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Description changed by rws:
Old description:
> {{{
> t = var('t')
> sage: f = function('f')
> sage: desolve(diff(f,t) - (f+1)/(t+1), f)
> ...
> TypeError:
> }}}
> The same error can be had with the simple `SR(sin)`, i.e., any function
> object in contrast to the resp. function call, which returns an
> `Expression`.
>
> Since function objects can be used in other context it seems they should
> be part of symbolic expressions too. This ticket however will limit
> itself to giving a better error message in `SR.coerce` and handling
> `Function` objects in `calculus/functional.py:derivative()`.
New description:
{{{
t = var('t')
sage: f = function('f')
sage: desolve(diff(f,t) - (f+1)/(t+1), f)
...
TypeError:
}}}
The same error can be had with the simple `SR(sin)`, i.e., any function
object in contrast to the resp. function call, which returns an
`Expression`.
Since function objects can be used in other context it seems they should
be part of symbolic expressions too. This ticket however will limit itself
to giving a better error message in `SR.coerce` and handling `Function`
objects in `calculus/functional.py:derivative()`.
See also #15025
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Ticket URL: <http://trac.sagemath.org/ticket/17701#comment:8>
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