#7401: Derivative at a point is not translated into Maxima
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Reporter: robert.marik | Owner: was
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.2.1
Component: interfaces | Keywords: derivative, at, maxima
Work_issues: | Author: Robert Marik
Reviewer: | Merged:
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Changes (by newvalueoldvalue):
* status: needs_review => needs_work
* author: => Robert Marik
Comment:
Replying to [comment:1 robert.marik]:
> Submitted patch solves the problem described above
>
Yes, this should do so. It would probably be best to add one more
doctest, just to show that the original one works (i.e. without showing
the Maxima internals).
> limitation and disadvantage of this patch are:
>
> * it works for univariable functions only
That's fine - that's still improving the previous situation, correct?
Looking at the code, it would be helpful to know what happens if params
has more than one element - particularly in
{{{
return "at(diff('%s(dummy_var_der), %s),dummy_var_der=%s)"%(f.name(), ",
".join(params), opnds[0])
}}}
it seems like one could have more items in the substitution tuple than
there are %s to fill up, even if for some reason len(args)==1. What is
the relation between args and params - could there be more params than
args?
Also, make sure to add a doctest showing that the NotImplementedError
comes into play. Search for 'Traceback' in the file to see how the
doctests for errors look.
>
> * introduces new dummy variable into Maxima session
This is unfortunate, but probably unavoidable currently. You should test
whether this breaks anything in Maxima, but I don't see why it would.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7401#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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