#6934: Fix eigenvectors (and a lot of other stuff) for symbolic matrices
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Reporter: kcrisman | Owner: was
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-4.4.3
Component: linear algebra | Keywords: symbolics, matrices, polynomials
Author: Jason Grout | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by rbeezer):
Hi Jason,
I can't get this to finish on a non-trivial 3x3 matrix.
9 different variables: 100 minutes, 2 GB memory used, killed my system
3x3 `VanderMonde` matrix, with one variable per row (each row is the 0, 1,
2 powers of the variable). I killed it after 5 minutes.
So, yes, this would be nice for completeness, but seems of very limited
value. Do you (or anybody reading this) have any bigger, more interesting
examples that actually finish?
The characteristic polynomial of a symbolic matrix can be computed quite
quickly. I don't imagine there is a good way to factor such a thing,
though?
Rob
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6934#comment:9>
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