#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-4.3
Component: interfaces | Keywords: derivative, at, maxima
Work_issues: | Author: Robert Marik
Reviewer: | Merged:
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Comment(by robert.marik):
Replying to [comment:5 kcrisman]:
> Why not see if that works, then update the patch? One might have to be
careful in testing for how many variables/args there are. I am never
clear on the difference between those two things, anyway, in Sage.
My suggestion related to f.variables() does not work, since I cannot acces
the variables inside the function derivative.
The original patch does not work for something like
diff(f(x,y),x).subs(x=3) so I updated it and tested for various
combination how many variables are in the function, how many variables
appear at the resulting expression, how many variables are substituted
etc.
Perhaps could be improved for multivariable functions, but Maxima
expression "at (expr, [eqn_1, ..., eqn_n])" cannot be translated to
current Sage and both issues should be fixed together. Perhaps in this
ticket? (leaving as needs_work, despite the fact that the original problem
has been fixed and doctested)
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7401#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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