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[PATCH 0 of 4] Permutation matrices: One bugfix, one enhancement, sparse
From: |
John W. Eaton |
Subject: |
[PATCH 0 of 4] Permutation matrices: One bugfix, one enhancement, sparse-perm ops, and a use in lu(). |
Date: |
Wed, 11 Mar 2009 00:51:33 -0400 |
On 10-Mar-2009, Jason Riedy wrote:
| The bugfix:
| * Make the column permutation vector in sparse LU cols()-long.
|
| The simple enhancement:
| * Add an override to Octave's find() for permutation matrices.
| Seems odd that find takes O(n^2) time on permutation matrices. IIRC,
| it's the only operation to convert a perm. matrix to a perm. vector.
|
| The operations:
| * Add perm * sparse, perm \ sparse, sparse * perm, and sparse / perm
operations.
| There might be a way to use the existing indexing ops, but I couldn't
| see it.
|
| And a future use in lu:
| * sparse-perm-ops Have sparse LU return permutation matrices rather than
sparse matrices.
| This last one is included mostly because it flushed out the bug, but
| it is a thought for the future.
Did you intend to include a changeset with this message?
jwe
- [PATCH 0 of 4] Permutation matrices: One bugfix, one enhancement, sparse-perm ops, and a use in lu()., Jason Riedy, 2009/03/10
- [PATCH 1 of 4] Make the column permutation vector in sparse LU cols()-long, Jason Riedy, 2009/03/10
- [PATCH 2 of 4] Add an override to Octave's find() for permutation matrices, Jason Riedy, 2009/03/10
- [PATCH 3 of 4] Add perm * sparse, perm \ sparse, sparse * perm, and sparse / perm operations, Jason Riedy, 2009/03/10
- [PATCH 4 of 4] Have sparse LU return permutation matrices rather than sparse matrices, Jason Riedy, 2009/03/10
- [PATCH 0 of 4] Permutation matrices: One bugfix, one enhancement, sparse-perm ops, and a use in lu().,
John W. Eaton <=
- Re: [PATCH 0 of 4] Permutation matrices: One bugfix, one enhancement, sparse-perm ops, and a use in lu()., Jaroslav Hajek, 2009/03/11