#10100: Segfault calling change_ring(RR) on a symbolic polynomial
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Reporter: davidloeffler | Owner: burcin
Type: PLEASE CHANGE | Status: new
Priority: major | Milestone:
Component: symbolics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The following code seems to crash Sage on some (but not all) systems:
{{{
sage: a = var('a')
sage: R.<x> = a.parent()[]
sage: (x - a).change_ring(RR) # boom!
}}}
This bug was originally spotted when calculating char polys of symbolic
matrices:
{{{
sage: a,b,c= var('a,b,c')
sage: mprime = matrix([[01,b+1,2],[a+1,2,1],[2,1,c+1]])
sage: cp = mprime.charpoly()
sage: cp.real_roots() # boom!
}}}
See [http://groups.google.co.uk/group/sage-
devel/browse_thread/thread/0ea6c973a56191ab/e91868cd98f7fb74 this sage-
devel thread].
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10100>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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