[#6616] Matrix::Matrix does not retain the correct rownames

Date:
2019-03-07 18:11 Priority:
3

State:
Closed

Submitted by:
Robrecht Cannoodt (rcannood) Assigned to:
Martin Maechler (mmaechler)

Hardware:
All Product:
None

Operating System:
Linux Component:
None

Version:
None Severity:
None

Resolution:
Fixed

URL:

Summary:
Matrix::Matrix does not retain the correct rownames

Detailed description
The bug is simple to reproduce: > m <- matrix(1, dimnames = list("a", "b")) > Matrix::Matrix(m, sparse = TRUE) 1 x 1 sparse Matrix of class "dsCMatrix" b b 1 I encountered this problem with Matrix v 1.2-15.

Comments:

Message
Date: 2019-03-11 14:23 Sender: Martin Maechler Your guess is correct: The bug is in R's isSymmetric(.) which is wrong here [only for 1x1 matrices with asymmetric dimnames]. Hence a bug in R -- which I now have fixed in the R sources. But "of course" it's still present in R 3.5.3 which was released today. As this is a border case, I don't think we should establish a workaround (of the R bug) in Matrix.
Date: 2019-03-07 18:16 Sender: Robrecht Cannoodt I guess the problem is that isSymmetric(m) is TRUE. I would argue that the above scenario is undesired though, because it results in unexpected errors in certain edge cases.

Field	Old Value	Date	By
status_id	Open	2019-03-11 14:23	mmaechler
close_date	None	2019-03-11 14:23	mmaechler
assigned_to	none	2019-03-11 14:23	mmaechler
Resolution	None	2019-03-11 14:23	mmaechler