This bugzilla service is closed. All entries have been migrated to

Bug 890

Summary: More robust detection of identical source/destination in PermutationMatrix products
Product: Eigen Reporter: ettersi
Component: LUAssignee: Nobody <eigen.nobody>
Severity: Wrong Result CC: chtz, ettersi, gael.guennebaud
Priority: Normal    
Version: 3.2   
Hardware: All   
OS: All   
Bug Depends on:    
Bug Blocks: 558    
Description Flags
Small example program showing the problem none

Description ettersi 2014-10-09 22:14:40 UTC
Created attachment 498 [details]
Small example program showing the problem

If all three "arguments" (matrix, rhs and output object) to partialPivLU are Maps, the output object is not written. 

I attached you a small example program showing the problem. It is slightly more complicated than a minimal example, but this is the exact situation I would like to work.
Comment 1 Gael Guennebaud 2014-10-10 16:24:43 UTC
It works fine with the devel branch. I'll investigate what goes wrong with the 3.2 branch.
Comment 2 Gael Guennebaud 2014-10-10 16:47:43 UTC
Partial fix:
Changeset:   ce8b4f787c0a
Branch:      3.2
User:        ggael
Date:        2014-10-10 14:42:32+00:00
Summary:     Bug 890: extract_data might returns 0x0 thus breaking aliasing detection

however, we still need a more robust mechanism to detect the input/output are same in both 3.2 and devel branch.
Comment 3 Gael Guennebaud 2015-06-10 08:10:19 UTC
The following changesets should be good enough to close this entry.
Summary:     Add regression test for bug 890
Summary:     Bug 890, add a more general routine to check that two dense object reference to the same data
Comment 4 Nobody 2019-12-04 13:48:51 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: