#18278: Variable to non-integral power for integer polynomials (using Flint) is
broken
-------------------------------------+-------------------------------------
Reporter: bruno | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.7
Component: commutative | Resolution:
algebra | Merged in:
Keywords: integer | Reviewers:
polynomials, exponentiation | Work issues:
Authors: Bruno Grenet | Commit:
Report Upstream: N/A | 49dc92ba66a2196af71ba62ef475e0403e43ac11
Branch: | Stopgaps:
u/bruno/ticket/non_integral_pow |
Dependencies: |
-------------------------------------+-------------------------------------
Changes (by vdelecroix):
* status: needs_review => needs_work
Comment:
Salut Bruno,
1. You introduced trailing whitespaces, please remove them.
2. Why would you want to do that
{{{
try:
nn = PyNumber_AsSsize_t (exp, OverflowError)
except TypeError:
raise TypeError("non-integral exponents not supported")
}}}
the problem comes from the fact that you can cast rationals to Python
int
{{{
sage: int(2/3)
0
}}}
I would very much prefer
{{{
cdef long u = exp
if exp != u:
raise TypeError("...")
}}}
Vincent
--
Ticket URL: <http://trac.sagemath.org/ticket/18278#comment:3>
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