#9937: PARI real precision is broken in many ways
--------------------------+-------------------------------------------------
Reporter: jdemeyer | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.6
Component: interfaces | Keywords: pari gp real precision
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
--------------------------+-------------------------------------------------
The following do not work as they should (try these examples with a
freshly started copy of Sage, such that everything is default).
{{{
# Default: 2 significant words (while we really should get only 1)
sage: pari('Pi').debug()
[&=0000000004fc9620] REAL(lg=4):0400000000000004
(+,expo=1):6000000000000001 c90fdaa22168c234 c4c6628b80dc1cd1
# Change precision and then change it back: we get 1 word
sage: n = pari.get_real_precision(); pari.set_real_precision(100);
pari.set_real_precision(n);
sage: pari('Pi').debug()
[&=00000000012bf200] REAL(lg=3):0400000000000003
(+,expo=1):6000000000000001 c90fdaa22168c235
}}}
{{{
# We cannot compute constants with high precision:
sage: pari.set_real_precision(1000);
sage: pari.euler().debug()
[&=0000000004f75e20] REAL(lg=3):0400000000000003
(+,expo=-1):5fffffffffffffff 93c467e37db0c7a5
}}}
Dependencies: #9898, #9893
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9937>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
