#20454: conversion from SR[] to SR
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.2
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by rws:
Old description:
> Even if there are identical generator and variable names there should not
> be a problem to convert from a univariate polynomial with symbolic
> coefficients to a symbolic expression, but:
> {{{
> sage: S.<y> = PolynomialRing(SR)
> sage: p = y^2 + pi*y + 1
> sage: p.coefficients()
> [1, pi, 1]
> sage: ex = SR(p)
> ...
> TypeError: not a constant polynomial
> }}}
New description:
Even if there are identical generator and variable names there should not
be a problem to convert from a univariate polynomial with symbolic
coefficients to a symbolic expression, but:
{{{
sage: S.<y> = PolynomialRing(SR)
sage: p = y^2 + pi*y + 1
sage: p.coefficients()
[1, pi, 1]
sage: ex = SR(p)
...
TypeError: not a constant polynomial
}}}
See #20453 and #20312 for motivation.
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Ticket URL: <http://trac.sagemath.org/ticket/20454#comment:2>
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