#11202: Add inverse method to symbolic expressions
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Reporter: ltw | Owner: tba
Type: enhancement | Status:
needs_review
Priority: minor | Milestone: sage-5.3
Component: symbolics | Resolution:
Keywords: InverseFunction, inverse function | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Eviatar Bach | Merged in:
Dependencies: | Stopgaps:
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Comment (by eviatarbach):
Replying to [comment:10 tkluck]:
> I've taken a look at your patch (haven't tried it yet). It looks like
good work! Here's some feedback:
>
> {{{
> if not with_respect_to:
> raise TypeError('You must specify with respect to which \
> variable to take the inverse.')
> }}}
> I would test for
> {{{
> if with_respect_to == None or not with_respect_to.is_symbol():
> }}}
> I also think that a `ValueError` is more appropriate than a `TypeError`.
>
> Also, it would be a nice enhancement if something like this would work:
> {{{
> sage: f(x) = log(x)
> sage: f
> x |--> log(x)
> sage: inverse(f)
> x |--> exp(x)
> }}}
> (or does it?)
Thanks for the feedback! I'll see if I can work on this soon.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11202#comment:11>
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