I would have thought that A.monomial(L) where L is either a listor
tuple of the right length would be a very natural thing to add for
multivariate polynomial rings. You could define your own as a
work-around:
sage: def monomial(A,L):
return A({tuple(L): A.base_ring().one_element()})
sage: monomial(A,[2,3,4])
x^2*y^3*z^4
John
On 1 October 2013 15:58, Ursula Whitcher <whitc...@uwec.edu> wrote:
> On 10/1/2013 8:51 AM, John Cremona wrote:
>
>>> Can somebody explain this syntax to me? I understand tuple([1,1,1]), but
>>> what are the curly brackets and the colon doing?
>>
>>
>> The argument is a python dict, which you should read up about for more
>> details.
>
>
> Thanks, that's exactly what I needed to know!
>
>>> Also, is there a reason that A.monomial([1,1,1]) does not return the same
>>> result?
>>
>>
>> You did not make precise what type your A is but if I define
>>
>> sage: A.<x,y,z> = QQ[]
>> sage: A
>> Multivariate Polynomial Ring in x, y, z over Rational Field
>> sage: type(A)
>> <type
>> 'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomialRing_libsingular'>
>>
>> then A has no method called "monomial".
>
>
> Very true. I suppose what I was asking was, would it be useful to human
> beings who are not me to wrap the python-esque syntax in a Sage function?
> And if so, is "monomial" the right thing to call the function, or should
> A.monomial() naturally refer to some other operation?
>
>
> --Ursula.
>
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