#10268: adding GiNaC method to simplify_rational
---------------------------+------------------------------------------------
Reporter: bgoodri | Owner: burcin
Type: enhancement | Status: new
Priority: minor | Milestone: sage-4.6.2
Component: symbolics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by bgoodri):
Replying to [comment:3 kcrisman]:
I am just learning sage, but it seems that the compiler does not like the
GEx to be declared inside a conditional statement, which makes sense. The
_sig_on and _sig_off thing I think is for catching segfaults, which
doesn't seem to be a problem and when I comment those out, the behavior is
the same. A slight possibility is the fact that when I use the GiNaC shell
directly it is the most recent version, whereas Pynac forked off an older
version, but the normal function has been in GiNaC for a long, long time.
More interesting is that when I interrupt sage, I get this traceback
{{{
KeyboardInterrupt Traceback (most recent call
last)
/media/disk30/sage-4.6/<ipython console> in <module>()
/media/disk30/sage-4.6/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.simplify_rational
(sage/symbolic/expression.cpp:23989)()
/media/disk30/sage-4.6/local/lib/python2.6/site-
packages/sage/symbolic/pynac.so in sage.symbolic.pynac.py_gcd
(sage/symbolic/pynac.cpp:6440)()
/media/disk30/sage-4.6/local/lib/python2.6/site-
packages/sage/rings/arith.pyc in gcd(a, b, **kwargs)
1363 sigma = Sigma()
1364
-> 1365 def gcd(a, b=None, **kwargs):
1366 r"""
1367 The greatest common divisor of a and b, or if a is a list and
b is
/media/disk30/sage-4.6/local/lib/python2.6/site-
packages/sage/interfaces/get_sigs.pyc in my_sigint(x, n)
7
8 def my_sigint(x, n):
----> 9 raise KeyboardInterrupt
10
11 def my_sigfpe(x, n):
KeyboardInterrupt:
}}}
Why would it fall into the gcd function from
/media/disk30/sage-4.6/local/lib/python2.6/site-
packages/sage/rings/arith.pyc? The patch does not call it directly, and it
is a waste because normal in GiNaC already cancels the greatest common
factor from the numerator and the denominator. And then a related question
is why does gcd seem to hang?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10268#comment:4>
Sage <http://www.sagemath.org>
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