#18158: `__getitem__` for libGap_Element
--------------------------+----------------------------
Reporter: vdelecroix | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-6.6
Component: interfaces | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
--------------------------+----------------------------
There are two issue with `__getitem__` on gap vs libgap elements:
- gap indices start with `1`. This is respected with the gap interface
but not with the libgap interface
- most libgap elements lacks a `__getitem__`
Compare:
{{{
sage: irr = libgap.Irr(libgap.CharacterTable(S))
sage: irr[0]
Character( CharacterTable( Sym( [ 1 .. 10 ] ) ), [ 1, -1, 1, -1, 1, -1, 1,
-1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1,
-1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1 ] )
sage: irr[0][0]
Traceback (most recent call last):
...
TypeError: 'sage.libs.gap.element.GapElement' object has no attribute
'__getitem__'
}}}
with
{{{
sage: irr = gap.Irr(gap.CharacterTable(S))
sage: irr[1]
Character( CharacterTable( SymmetricGroup( [ 1 .. 10 ] ) ),
[ 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1,
1,
-1, 1, -1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1 ] )
sage: irr[1][1]
1
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18158>
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 unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
