On 9/7/10 3:34 PM, tvn wrote:
Hi John and Jason, thanks -- the inject_variables() did what I
want.
I have another question below and hope you can help
what if I already have create a function call f = x - y as below
sage: vs = var('x y')
sage: f = x - y
sage: type(f)
<type 'sage.symbolic.expression.Expression'>
now I want to convert f to
sage.rings.polynomial.multi_polynomial_element.MPolynomial_polydict ,
is there any convenient way to do so ? One way is to define
variables x,y in PolynomialRing QQ and then redefine f = x-y but it's
quite inconvenient.
Try the .polynomial() method:
sage: var('x,y')
(x, y)
sage: f=x-y
sage: g=f.polynomial(QQ)
sage: g
x - y
sage: type(g)
<type
'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular'>
sage: g.variables()
(x, y)
sage: g.parent()
Multivariate Polynomial Ring in x, y over Rational Field
Jason
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