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extracting coefficient x-1 out of symbolic series wrong #15830

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dkrenn opened this issue Feb 18, 2014 · 1 comment
Open

extracting coefficient x-1 out of symbolic series wrong #15830

dkrenn opened this issue Feb 18, 2014 · 1 comment
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c: symbolics p: major / 3 t: bug

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@dkrenn
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dkrenn commented Feb 18, 2014 

sage: x.series(x==1,10).coefficient(x-1,0)
x

which is wrong. It should be 1, which can be seen by

sage: x.series(x==1,10)
1 + 1*(x - 1)

We also have wrong results here:

sage: x.series(x==1,10).coefficient(x-1,1)
0
sage: x.series(x==1,10).coefficient(x-1)
0

Component: symbolics

Keywords: symbolic, series, coefficient, wrong

Issue created by migration from https://trac.sagemath.org/ticket/15830
@dkrenn dkrenn added this to the sage-6.2 milestone Feb 18, 2014
@sagetrac-vbraun-spam sagetrac-vbraun-spam mannequin modified the milestones: sage-6.2, sage-6.3 May 6, 2014
@sagetrac-vbraun-spam sagetrac-vbraun-spam mannequin modified the milestones: sage-6.3, sage-6.4 Aug 10, 2014
@rwst
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rwst commented Dec 25, 2014

comment:3

Also coefficient can only deal with monomials:

sage: (x-1).coefficient(x-1)
0

Different ticket?

@mkoeppe mkoeppe removed this from the sage-6.4 milestone Dec 29, 2022
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@rwst @mkoeppe @dkrenn