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pythonsagepolynomials

NameError when using Sage polynomials

I read here how to work with polynomials. But when I try this

R = QQ['t']
poly = (t+1) * (t+2); poly

Sage gives me the following error:

NameError: name 't' is not defined

What can I do about it?

Solution

  • Right, you have to inject the variable name when using polynomial rings. The document you point to points out that

    sage: R.<t> = PolynomialRing(QQ)

    does do this. Or, you can do

    sage: R=QQ['t']
sage: R.inject_variables()
Defining t
sage: t+1
t + 1

    You wanted to know how to do it without printing the name:

    sage: R.inject_variables(verbose=False)

    Have fun!