#8626: qqbar quadratic elements
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Reporter: jason | Owner: AlexGhitza
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.6
Component: algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by jason):
* cc: cwitty (added)
* priority: minor => major
Comment:
Here is another problem that could probably be solved if qqbar elements
could be converted to symbolics. The application for this example was
trying to plot a line from the eigenvector of a matrix:
{{{
sage: A=matrix(QQ,2,2,[2,5,1,2])
sage: EV=A.right_eigenvectors()
sage: EV
[(-0.2360679774997897?, [(1, -0.4472135954999580?)], 1),
(4.236067977499789?, [(1, 0.4472135954999580?)], 1)]
sage: evec=EV[0][1][0]
sage: var('t')
t
sage: evec.n()*t # works fine
(t, -0.447213595499958*t)
sage: t*evec
Traceback (most recent call last):
...
NotImplementedError: symbol
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8626#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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