#18420: Uniformize truncated multiplication for polynomials
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.7
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/18420 | b73a8404319fc0f7542989c340376c43610bc1e0
Dependencies: | Stopgaps:
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Description changed by vdelecroix:
Old description:
> The operation `_mul_trunc` on polynomials is currently only implemented
> in specialized classes with custom declaration. We define a global one in
> Polynomial with signature
> {{{
> class Polynomial:
> cpdef _mul_trunc_(self, Polynomial right, long n)
> }}}
> (and deprecate the former _mul_trunc).
>
> We also add specialized implentation for integer polynomials (relying on
> `fmpz_poly_mullow`) and rational polynomials (relying on
> `fmpq_poly_mullow`).
New description:
The operation `_mul_trunc` on polynomials is currently only implemented in
specialized classes with custom declaration. We define a global one in
Polynomial with signature
{{{
class Polynomial:
cpdef Polynomial _mul_trunc_(self, Polynomial right, long n)
}}}
(and deprecate the former _mul_trunc).
We also add specialized implentation for integer polynomials (relying on
`fmpz_poly_mullow`) and rational polynomials (relying on
`fmpq_poly_mullow`).
Such method would be really helpful for multiplication of power series.
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Ticket URL: <http://trac.sagemath.org/ticket/18420#comment:6>
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