#8139: Can not compute (very) high power of WordMorphism
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Reporter: vdelecroix | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-4.8
Component: combinatorics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Changes (by mjo):
* cc: mjo (added)
Comment:
The example morphism,
{{{
sage: m = WordMorphism('a->ab,b->ba')
}}}
doubles the length of its input on every application. So,
{{{
sage: m^31
}}}
will double the length of 'a' 31 times. That's just enough so that the
length of the result overflows a signed integer, and thus it complains,
"Stop argument for islice() must be a non-negative integer..."
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8139#comment:2>
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