This bugzilla service is closed. All entries have been migrated to
Bug 918 - Add additional methods to control and access status results to UmfPackLU
Summary: Add additional methods to control and access status results to UmfPackLU
Alias: None
Product: Eigen
Classification: Unclassified
Component: Sparse (show other bugs)
Version: 3.3 (current stable)
Hardware: All All
: Normal Feature Request
Assignee: Nobody
Depends on:
Reported: 2014-12-15 00:22 UTC by João Rui Leal
Modified: 2019-12-04 13:58 UTC (History)
2 users (show)

patch for UmfPackSupport.h (2.66 KB, patch)
2014-12-15 00:22 UTC, João Rui Leal
no flags Details | Diff

Description João Rui Leal 2014-12-15 00:22:18 UTC
Created attachment 507 [details]
patch for UmfPackSupport.h

UmfPackLU allows to perform factorizations where the matrix is singular, although this factorization cannot be used to solve linear systems, the LU factorization is still valid.

umfpack_numeric can return the status:
Which is a successful factorization (from umfpack manual):
"UMFPACK_WARNING_singular_matrix: Numeric factorization was successful, but the matrix is singular"

It would be nice to access this return status so that the LU factorization could still be used. For instance, I would need this to use the LU factorization for a nullspace basis evaluation.

It would also be interesting to see/change the default settings of umfpack.

I have attached a patch that would add these features.
Comment 1 Gael Guennebaud 2015-11-27 21:06:36 UTC
Pushed after some minor renaming:
Comment 2 Nobody 2019-12-04 13:58:33 UTC
-- GitLab Migration Automatic Message --

This bug has been migrated to's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance:

Note You need to log in before you can comment on or make changes to this bug.