#19797: Build GSL in IEEE 754 compliant mode
-------------------------------------+-------------------------------------
Reporter: jdemeyer | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.0
Component: packages: | Resolution:
standard | Merged in:
Keywords: | Reviewers:
Authors: Jeroen Demeyer | Work issues:
Report Upstream: Reported | Commit:
upstream. Developers acknowledge | 694feb2d71ebf521cf5f32dba69e0406d16e9f11
bug. | Stopgaps:
Branch: |
u/jdemeyer/ticket/19797 |
Dependencies: #19796 |
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Comment (by jdemeyer):
Replying to [comment:13 rws]:
> This is real as well and could be rewritten as a sum of trig function
expressions.
Volker's point is about being "manifestly" real, which means: an
expression which will always give a real result when evaluated, even if
sub-expressions introduce numerical noise.
An expression like
{{{
e^(4*I*x) + e^(-4*I*x)
}}}
(for real `x`) is not manifestly real, since there is no guarantee that
the imaginary parts of the two terms will ''exactly'' cancel out.
--
Ticket URL: <http://trac.sagemath.org/ticket/19797#comment:14>
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