#7728: Make matrix factorizations immutable and cached
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Reporter: dagss | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.3.1
Component: linear algebra | Keywords:
Work_issues: | Author: Dag Sverre Seljebotn
Upstream: N/A | Reviewer:
Merged: |
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The attached patch (based on 4.3.rc0):
- changes Cholesky (all/most matrices) and SVD, QR and LU factorizations
(double_dense only) so that the returned resulting matrices are immutable
- adds caching for Cholesky, SVD and QR
- adds pickle-able caching for LU (and it is likely there was a a bug
with pickling/unpickling a matrix with a cached factorization which this
patch fixes...)
- improves doctests for SVD and QR (I wanted to more easily check that my
changes didn't cause regressions...)
- adds methods {{{zero_at}}} and {{{round}}} to dense double matrices
(used in said doctests)
I hope the doctest improvements can be accepted as part of the patch even
if I didn't bother to split it up.
Note that when dealing with matrix factorization doctesting, just avoiding
0 in the input goes very far with creating readable tests.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7728>
Sage <http://www.sagemath.org>
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