#8606: floats in exponent do not propagate
--------------------------------+-------------------------------------------
Reporter: zimmerma | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-4.4
Component: basic arithmetic | Keywords: float, RR
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by zimmerma):
William, in fact {{{nn = PyNumber_Index(n)}}} raises an error, thus we go
to
{{{
try:
nn = Integer(n)
except TypeError:
try:
s = parent_c(n)(self)
return s**n
}}}
where {{{nn = Integer(n)}}} succeeds for n=53.0, but fails for n=53.1:
{{{
sage: Integer(53.0)
53
sage: Integer(53.1)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/users/caramel/zimmerma/detached/<ipython console> in <module>()
/usr/local/sage-core2/local/lib/python2.6/site-
packages/sage/rings/integer.so in sage.rings.integer.Integer.__init__
(sage/rings/integer.c:6449)()
/usr/local/sage-core2/local/lib/python2.6/site-
packages/sage/rings/real_mpfr.so in
sage.rings.real_mpfr.RealNumber._integer_ (sage/rings/real_mpfr.c:11846)()
TypeError: Attempt to coerce non-integral RealNumber to Integer
}}}
If {{{Integer(53.0)}}} would return an error too, this would fix the
problem. However we would
then need a specific method to coerce an integral real number to
integer...
On a side note, {{{int}}} seems to behave differently:
{{{
sage: int(53.0)
53
sage: int(53.1)
53
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8606#comment:3>
Sage <http://www.sagemath.org>
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