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Bug 1064

Summary: Question regarding Ref<SparseVector>
Product: Eigen Reporter: Benjamin Chretien <chretien>
Component: SparseAssignee: Nobody <eigen.nobody>
Status: RESOLVED FIXED    
Severity: Feature Request CC: chtz, gael.guennebaud
Priority: Normal    
Version: 3.3 (current stable)   
Hardware: All   
OS: All   
Whiteboard:
Bug Depends on:    
Bug Blocks: 558    
Attachments:
Description Flags
Test with Ref<SparseMatrix/SparseVector> none

Description Benjamin Chretien 2015-09-15 03:03:37 UTC 
Created attachment 604 [details]
Test with Ref<SparseMatrix/SparseVector>

Hi,

In the Eigen 3.3-alpha1 pre-release, I noticed that support for Ref<SparseMatrix> was added (which is greatly appreciated!). While doing a quick check to see if one of our projects, RobOptim (http://www.roboptim.net/), was working with the changes made to Eigen (we rely heavily on Eigen features such as Ref, sparse matrices/vectors etc.), I realized that Ref<SparseVector> is currently not possible. Is that a known issue/missing feature part of a to-do list? It may be worth adding to the changelog, since people may wrongly assume that Ref<SparseMatrix> support implies Ref<SparseVector> support.

Nonetheless, thanks for the great work on that new release!

Best regards,
Benjamin
Comment 1 Gael Guennebaud 2015-09-19 19:53:47 UTC 
Thank you for the report. The truth is that I always forgot about SparseVector (not really useful IMO), but yes, Ref<SparseVector> is indeed useful to access to "inner-vectors" of a sparse matrix. So we should add support for it (and Map<SparseVector> too)
Comment 2 Gael Guennebaud 2015-10-26 15:27:36 UTC 
Fixed in changeset 7755655e28d6
Comment 3 Nobody 2019-12-04 14:54:35 UTC 
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