On Sat, Jul 19, 2008 at 8:04 AM, David Joyner <[EMAIL PROTECTED]> wrote:
>
> One way:
>
> sage: SR = SymbolicExpressionRing()
> sage: a = var("a")
> sage: R = LaurentPolynomialRing(SR,"t")
> sage: t = R.gen()
> sage: f = sqrt(a)*t+t^(-2)
> sage: f.exponents()
> [(1,), (-2,)]
Your f is not a symbolic expression, so I don't think that really
solves Andrey's problem. Andrey, you should use the
coeffs method of symbolic expressions:
sage: var('a,t')
(a, t)
sage: f = sqrt(a)*t + 1/t^2
sage: f.coe
f.coeff f.coefficient f.coefficients f.coeffs
sage: f.coeffs(t)
[[1, -2], [sqrt(a), 1]]
Notice the -2, which gives the degree.
>
>
> On Sat, Jul 19, 2008 at 1:07 AM, Andrey Novoseltsev <[EMAIL PROTECTED]> wrote:
>>
>> Hello,
>>
>> I have a symbolic expression which is a polynomial in t and t^(-1). I
>> want to multiply it by some power of t so that it is a polynomial of
>> t. How can I determine this power? Coefficients are some symbolic
>> expressions in other variables, e.g. sqrt(a)*t+1/t^2.
>>
>> Thank you,
>> Andrey
>> >
>>
>
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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