#4246: bug in coercing symbolic expressions to polynomial rings
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Reporter: AlexGhitza | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-3.1.3
Component: calculus | Keywords:
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This was reported by William Stein at #4106:
I did notice this unfortunate property of the _polynomial_ function that
is used
to implement this patch, namely it does something dumb when given x+y as
input:
{{{
sage: var('x')
x
sage: var('y')
y
sage: S = PolynomialRing(Integers(4),1,'x')
sage: S(x+y)
2*x
sage: (x+y)._polynomial_(S)
2*x
}}}
I think in this case it should raise a !TypeError.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4246>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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