#20889: truncated power for polynomials
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: positive_review
Priority: major | Milestone: sage-7.3
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers: Bruno Grenet
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/20889 | d7d124e53af86ddf8b29f404f5b1b92ef42e7f61
Dependencies: | Stopgaps:
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Changes (by bruno):
* status: needs_review => positive_review
* reviewer: => Bruno Grenet
Comment:
Replying to [comment:14 vdelecroix] & [comment:15 vdelecroix]:
> I see. You mean for `prec`. As in your example, this would only be
interesting for sparse polynomials. Note that it will not work at all for
dense polynomials because `truncate` is defined as `cpdef Polynomial
truncate(self, long prec)`. I don't mind changing the generic method to
handle this case.
> I can not change `long -> Integer` for `prec`. The reason is that
`truncate` (for both dense and sparse polynomials) is declared as `cpdef
truncate(self, long n)`.
For dense polynomials, this makes sense because of the size of the
representation. For sparse polynomials, I think this is a problem and I
encountered it several times: For sparse polynomials to have an interest,
one should not bound their degree. But anyway, this is not the purpose of
this ticket.
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Ticket URL: <https://trac.sagemath.org/ticket/20889#comment:16>
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