#10774: RuntimeError message for numerical infinite loop is printed, not thrown
-------------------------+--------------------------------------------------
Reporter: niles | Owner: jason, jkantor
Type: defect | Status: new
Priority: major | Milestone:
Component: numerical | Keywords: RuntimeError numerics recursion-depth
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Reported in [http://ask.sagemath.org/question/375/any-way-to-turn-off-
error-msg-when-i-catch-the this question] at Ask Sage, there is a bug in
some infinite loops which causes a `RuntimeError` to be printed, but not
thrown as an exception. This means it cannot be caught by `try/except`
blocks.
{{{
def number(expr):
try:
n = N(expr)
except RuntimeError:
n = 0
return n
}}}
{{{
sage: expr=log(arcsin(e))
sage: a=number(expr)
Exception RuntimeError: 'maximum recursion depth exceeded in
__subclasscheck__' in <type 'exceptions.RuntimeError'> ignored
sage: a
0
}}}
Similar problems are reported with `N(log(NaN))`.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10774>
Sage <http://www.sagemath.org>
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