#20824: Expression.coefficient() problems
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by rws:
Old description:
> There is no reason why there should be different results:
> {{{
> sage: (x*(x*y+y^2)).coefficient(x)
> y
> sage: (x*(x*y+y^2)).coefficient(x,2)
> 0
> sage: (x*(x*y+y^2)).expand().coefficient(x)
> y^2
> sage: (x*(x*y+y^2)).expand().coefficient(x,2)
> y
> }}}
> This would also be unsurprising for Mma users, see
> http://trac.sagemath.org/ticket/9505#comment:6
New description:
There is no reason why there should be different results:
{{{
sage: (x*(x*y+y^2)).coefficient(x)
y
sage: (x*(x*y+y^2)).coefficient(x,2)
0
sage: (x*(x*y+y^2)).expand().coefficient(x)
y^2
sage: (x*(x*y+y^2)).expand().coefficient(x,2)
y
}}}
This would also be unsurprising for Mma users, see
http://trac.sagemath.org/ticket/9505#comment:6
Maybe add keyword `expand=True`.
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Ticket URL: <http://trac.sagemath.org/ticket/20824#comment:3>
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