#13271: wrong sign with function Ei and limit
-------------------------+--------------------------------------------------
Reporter: dkrenn | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-5.3
Component: symbolics | Keywords: Ei limit sign
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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We have
{{{
sage: (Ei(-Z)).limit(Z=oo)
Infinity
}}}
which is wrong, since it should be 0. It seems that there goes something
wrong with the {{{-}}} sign. This can be also seen here:
{{{
sage: (Ei(-Z)).limit(Z=1000)
-Ei(1000)
sage: (Ei(-Z)).limit(Z=1000).n()
-1.97204513714124e431
}}}
But
{{{
sage: Ei(-1000).n()
-5.07089306023517e-438
sage: -Ei(1000).n()
-1.97204513714124e431
}}}
which are the correct results.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13271>
Sage <http://www.sagemath.org>
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