On Parametric Polynomial

[Yiming Yang]

 Hello All,

    My question may be naive, as I'm new to Sympy. I tried to find how Sympy defines parametric polynomials, i.e. polynomials with indeterminate coefficients (K[U][X] with coefficients in K[U]), but could not figure it out. I checked those domains defined in sympy.polys.domains, and thought "CompositeDomain" might help, but I was confused by its usage. Could anyone give an example of it to me, if it is the correct class I'm looking for? Thank you!


Sincerely,
Yiming Yang

[Kalevi Suominen]

A simple way of defining such a polynomial ring is the following.

 >>> U, X = symbols('U, X')
>>> R = ZZ[U][X]
>>> R.gens
(X,)
>>> R.domain
ZZ[U]

Other rings can be used instead of ZZ.

[Yiming Yang]

Hi Kalevi,

    Thank you so much! Now I have a good starting point. I really appreciate it.

Sincerely,

Yiming

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