#8157: why the bit limit of 2^24 in RealField?
---------------------------------------------------+------------------------
Reporter: zimmerma | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.3.4
Component: basic arithmetic | Keywords:
Author: Francois Maltey and Paul Zimmermann | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
---------------------------------------------------+------------------------
Description changed by AlexGhitza:
Old description:
> {{{
> sage: R = RealField(16777217)
> ---------------------------------------------------------------------------
> ValueError Traceback (most recent call
> last)
>
> /users/caramel/zimmerma/.sage/temp/patate.loria.fr/31828/_users_caramel_zimmerm\
> a__sage_init_sage_0.py in <module>()
>
> /usr/local/sage-core2/local/lib/python2.6/site-
> packages/sage/rings/real_mpfr.so\
> in sage.rings.real_mpfr.RealField_constructor
> (sage/rings/real_mpfr.c:3723)()
>
> /usr/local/sage-core2/local/lib/python2.6/site-
> packages/sage/rings/real_mpfr.so\
> in sage.rings.real_mpfr.RealField.__init__
> (sage/rings/real_mpfr.c:3945)()
>
> ValueError: prec (=16777217) must be >= 2 and <= 16777216.
> }}}
> Note that 2^24 bits is only slightly above 5M digits, which is
> quite small (Fabrice Bellard recently computed 2700 billions of digits of
> Pi on a personal desktop, i.e., about 500,000 times more).
> of Pi
New description:
{{{
sage: R = RealField(16777217)
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/users/caramel/zimmerma/.sage/temp/patate.loria.fr/31828/_users_caramel_zimmerm\
a__sage_init_sage_0.py in <module>()
/usr/local/sage-core2/local/lib/python2.6/site-
packages/sage/rings/real_mpfr.so\
in sage.rings.real_mpfr.RealField_constructor
(sage/rings/real_mpfr.c:3723)()
/usr/local/sage-core2/local/lib/python2.6/site-
packages/sage/rings/real_mpfr.so\
in sage.rings.real_mpfr.RealField.__init__
(sage/rings/real_mpfr.c:3945)()
ValueError: prec (=16777217) must be >= 2 and <= 16777216.
}}}
Note that 2!^24 bits is only slightly above 5M digits, which is
quite small (Fabrice Bellard recently computed 2700 billions of digits of
Pi on a personal desktop, i.e., about 500,000 times more).
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8157#comment:2>
Sage <http://www.sagemath.org>
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