Hi Anastasia,
On 2017-03-15, Anastasia Theodouli <[email protected]> wrote:
> I would like to get in a list *ONLY* the coefficients of the following
> monomials of P (including zero coefficients in correct order)
>
> (x0^2, x0*x1, x1^2, x0*x2, x1*x2, x2^2, x0, x1, x2, 1)
If you only consider specific monomials, you may use .monomial_coefficient()
instead of .coefficients():
sage: P.<x0,x1,x2> = QQ[]
sage: p = (x0+x1+x2+1)^4
sage: M_list = [x0^2, x0*x1, x1^2, x0*x2, x1*x2, x2^2, x0, x1, x2, P(1)]
sage: [p.monomial_coefficient(M) for M in M_list]
[6, 12, 6, 12, 12, 6, 4, 4, 4, 1]
Remarks:
- Please do "p.monomial_coefficient?" to see the documentation of that
method. It is expected that the argument belongs to the same ring
(P, in the example) as the polynomial. Therefore I have P(1) and not
simply 1 in M_list.
- p.monomial_coefficient(M) does return 0 if M does not occur in
the polynomial p.
Best regards,
Simon
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