Unfortunately, it is still necessary in 5.11.beta3:
sage: R = PolynomialRing(QQ, 3, "x").fraction_field()
sage: R
Fraction Field of Multivariate Polynomial Ring in x0, x1, x2 over Rational Field
sage: R(SR("x0/x1"))
x0/x1
sage: R("x0/x1")
Traceback (most recent call last):
...
TypeError: no canonical coercion from Fraction Field of Multivariate Polynomial
Ring in x0, x1, x2 over Rational Field to Rational Field
And I certainly used fractional coefficients like that, so let's not just
remove SR - I'll think about alternatives. Perhaps we can try to use SR
only when not using it fails.
On Monday, 15 July 2013 20:08:30 UTC-6, Volker Braun wrote:
>
> Yes that line looks suspicious...
>
> On Monday, July 15, 2013 7:40:36 PM UTC-4, Ursula wrote:
>>
>> # Direct conversion "a/b" to F does not work in Sage-4.6.alpha3,
>> # so we go through SR, even though it is quite slow.
>> coefficients = (F(SR(coef)) for coef in coefficients)
>>
>
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