Hey Simon,
>
> On 2017-08-17, tsc...@ucdavis.edu <javascript:> <tsc...@ucdavis.edu
> <javascript:>> wrote:
> > about half of the time is in
> >
> > {method 'map_coefficients' of
> > 'sage.rings.polynomial.polynomial_element.Polynomial' objects}
> >
> > and subfunction calls. I would say a better solution would include
> > improving Polynomial.map_coefficients(). It probably would benefit from
> > more specialized implementations, specifically sparse and dense
> > implementations, as well as cythonization.
>
> What kind of polynomials is involved in that test? libsingular?
>
> I believe they are the generic polynomials:
sage: type(M.some_elements()[3]._x)
<class
'sage.rings.polynomial.polynomial_ring.PolynomialRing_field_with_category.element_class'
>
Best,
Travis
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