#7472: Taylor polynomial in two variables does not work
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Reporter: robert.marik | Owner: burcin
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.3.1
Component: calculus | Keywords: taylor polynomial, derivative
Work_issues: | Author: Robert Marik
Upstream: N/A | Reviewer: Karl-Dieter Crisman
Merged: |
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Comment(by kcrisman):
I assume the idea of different degrees for different variables was lost?
That really doesn't matter to me, though.
What about this one, from the documentation?
{{{
sage: x,y=var('x y'); taylor(x*y^3,(x,1),(y,-1),4)
(y + 1)^3*(x - 1) + (y + 1)^3 - 3*(y + 1)^2*(x - 1) - 3*(y + 1)^2 + 3*(y +
1)*(x - 1) - x + 3*y + 3
}}}
Why doesn't it end this way?
{{{
-(x-1)+3*(y+1) -1
}}}
Maybe this is documented in Maxima? It does seem odd, though, if I'm
understanding what a multivariable Taylor polynomial is supposed to look
like.
But overall this looks fine, assuming the Maxima computations are correct.
I am waiting for 4.3.alpha2 to build to see if there needs to be a rebase,
but surely it would be trivial if so.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7472#comment:10>
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