#19799: numerical approximation of zeta involving symbolic constants fails
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Reporter: behackl | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.0
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by rws):
Replying to [comment:1 behackl]:
> Could this be caused by any chance by the line
>
> {{{
> do_not_evalf_params().
> }}}
>
> in the
[https://github.com/pynac/pynac/blob/7e32cd6755eb16d59f5dab81e2e40300f7eff7e8/ginac/inifcns_nstdsums.cpp#L3842
registration of zeta in pynac, inifcns_nstdsums.cpp, line 3836ff]?
Yes, there appears to be a conceptual problem in that file because when I
remove that option the `zeta` problem goes away but then `polylog`
complains:
{{{
sage: polylog(sqrt(2),1).n()
3.02073767948603
polylog(4, 2).n()
...
TypeError: cannot evaluate symbolic expression numerically
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/19799#comment:2>
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