#20127: test_relation: uncaught NoConvergence
-------------------------------------+-------------------------------------
Reporter: behackl | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Benjamin Hackl | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/behackl/symbolic/test_relation/noconvergence|
4ddf10c1c65acabc21bae40d80b51735cf26be24
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Comment (by dkrenn):
Replying to [comment:5 behackl]:
> Could you try it with the following expression? This is the original one
which brought me to this error. If it works (which is rarely; maybe one
out of 20 times on my laptop here), it takes several seconds.
> {{{
> sage: bool(gamma(2 + k*pi*I/log(2)) * zetaderiv(1,
1+k*pi*I/log(2))/log(2)^10 == 0)
> }}}
{{{
from datetime import datetime
var('k')
for _ in range(10):
tic = datetime.now()
try:
result = bool(gamma(2 + k*pi*I/log(2)) * zetaderiv(1,
1+k*pi*I/log(2))/log(2)^10 == 0)
except Exception as e:
print datetime.now()-tic, 'exception:', e
else:
print datetime.now()-tic, 'successful:', result
}}}
returns
{{{
0:00:11.445669 exception: zeta: too much cancellation
0:00:08.250215 exception: zeta: too much cancellation
0:00:03.706793 exception: zeta: too much cancellation
0:00:02.428823 successful: False
0:00:00.757367 successful: False
0:00:16.853168 exception: zeta: too much cancellation
0:00:00.228982 successful: False
0:00:03.824248 successful: False
0:00:37.852729 exception: zeta: too much cancellation
0:00:15.264686 exception: zeta: too much cancellation
}}}
Seems like I am lucky to get that much exceptions ;)
--
Ticket URL: <http://trac.sagemath.org/ticket/20127#comment:8>
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