#19797: Build GSL in IEEE 754 compliant mode
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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: N/A | Commit:
Branch: | 694feb2d71ebf521cf5f32dba69e0406d16e9f11
u/jdemeyer/ticket/19797 | Stopgaps:
Dependencies: #19796 |
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Comment (by rws):
Replying to [comment:2 vbraun]:
> {{{
> sage: x = var('x', domain='real')
> sage: s = abs((1+I*x)^4); s
> (I*x + 1)^2*(-I*x + 1)^2
> }}}
> Isn't the real problem that abs does not default to `hold=True`
Maybe it's better to expand automatically if the result contains `I`.
Automatic expansion also resolved a similar problem in #18952
{{{
sage: x = var('x', domain='real')
sage: ((1+I*x)^4).abs().expand()
x^4 + 2*x^2 + 1
}}}
> so something that ought to be manifestly real is not.
It is but only when expanded.
--
Ticket URL: <http://trac.sagemath.org/ticket/19797#comment:8>
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