#14558: apply_map on sparse vectors returns vectors of smaller degree
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Reporter: tfeulner | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.10
Component: linear algebra | Resolution:
Keywords: apply_map, sparse vector | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Thomas Feulner | Merged in:
Dependencies: | Stopgaps:
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Changes (by tfeulner):
* status: new => needs_review
* component: algebra => linear algebra
Old description:
> Calling `apply_map` on a sparse vector with zeros at the last positions
> returns a vector of wrong degree.
>
> {{{
> sage: F.<a> = GF(9)
> sage: v = vector([a, 0,0,0], sparse=True)
> sage: f = F.hom([a**3])
> sage: v.apply_map(f)
> }}}
New description:
Calling `apply_map` on a sparse vector with zeros at the last positions
returns a vector of wrong degree.
{{{
sage: F.<a> = GF(9)
sage: v = vector([a, 0,0,0], sparse=True)
sage: f = F.hom([a**3])
sage: v.apply_map(f)
(2*a + 1)
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14558#comment:1>
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