FYI, I found a very similar issue with "exp" and "log" for purely imaginary
numbers:
http://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=1896
Nathan
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On 2017-02-13 10:19, John Cremona wrote:
Thanks Jeroen for the very fast diagnosis and fix.
The fix comes from PARI (Karim Belabas to be precise), not me.
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Thanks Jeroen for the very fast diagnosis and fix.
On 13 February 2017 at 08:23, Jeroen Demeyer wrote:
> On 2017-02-13 09:18, Jeroen Demeyer wrote:
>>
>> Reported upstream:
>> https://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=1895
>
>
> And already fixed (within
On 2017-02-13 09:18, Jeroen Demeyer wrote:
Reported upstream:
https://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=1895
And already fixed (within 30 minutes of reporting it!)
I will add the patch to
https://trac.sagemath.org/ticket/22276
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Reported upstream:
https://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=1895
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On 2017-02-12 21:14, Nils Bruin wrote:
sage: U=ComplexField(300)(1/2+sqrt(-3)/2)
sage: U._pari_()
0.500 + 0.866025403784439*I
so the thing the dilog is taken of doesn't even have the right precision
Actually, it does have the right precision, it's just that PARI only
prints a few
On Sunday, February 12, 2017 at 2:11:29 PM UTC-8, John Cremona wrote:
>
> About 8 years ago I spent a long time making sure that precision was
> handled correctly in converting between Sage and pari. Since then the
> interface has totally changed and possibly these recent changes are at
>
About 8 years ago I spent a long time making sure that precision was
handled correctly in converting between Sage and pari. Since then the
interface has totally changed and possibly these recent changes are at
fault.
Jeroen do you know the answer?
On 12 Feb 2017 20:14, "Nils Bruin"
On Sunday, February 12, 2017 at 10:59:06 AM UTC-8, Matthias Goerner wrote:
>
> Careful: you are changing the default precision before calling dilog. That
> might mask the problem with pari's dilog.
Indeed, the dilog is just implemented as
self._parent(self._pari_().dilog())
and:
sage:
Careful: you are changing the default precision before calling dilog. That
might mask the problem with pari's dilog.
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The dilog function is calling pari which does not seem to have this fault:
? \pb 600
realbitprecision = 600 significant bits (180 decimal digits displayed)
? z = (1+sqrt(-3))/2
%1 = 1/2 +
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