#12630: Add representations of quivers and quiver algebras to sage
------------------------------------------------------------------------------+
Reporter: JStarx |
Owner: AlexGhitza
Type: enhancement |
Status: needs_work
Priority: major |
Milestone: sage-5.11
Component: algebra |
Resolution:
Keywords: algebra, quiver, module, days49 |
Work issues: Use existing infrastructure for Representation, Homspace and
Morphism.
Report Upstream: N/A |
Reviewers:
Authors: Jim Stark, Simon King, Mathieu Guay-Paquet, Aladin Virmaux |
Merged in:
Dependencies: #12412, #12413 |
Stopgaps:
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Comment (by SimonKing):
Solution of the problem: In get_matrix, there is
{{{
list(self._vector[startdim:startdim + rows*cols])
}}}
If `__getitem__` of `self._vector` is asked to slice (which is the case
here), then it first creates the list and then creates a vector out of a
slice of that list (also creating a parent, I guess). And from the
resulting vector, we take the list.
It should instead be
{{{
self._vector.list()[startdim:startdim + rows*cols]
}}}
Then, `list()` is called only once, and no temporary slice vector is
created.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12630#comment:93>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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