[#6656] Error taking negation on sparseMatrix w/o `factors` slot, e.g. "dtTMatrix"

Date:
2020-02-05 08:40 Priority:
3

State:
Closed

Submitted by:
Chun Fung (Jackson) Kwok (kcf.jackson) Assigned to:
Martin Maechler (mmaechler)

Hardware:
None Product:
None

Operating System:
None Component:
None

Version:
None Severity:
normal

Resolution:
Fixed

URL:

Summary:
Error taking negation on sparseMatrix w/o `factors` slot, e.g. "dtTMatrix"

Detailed description
Hi, I would like to report that there seems to be an unexpected error when one takes negation after taking the Kronecker product of two diagonal matrices. Here is a minimal example: > - Matrix::Diagonal(2, 3) %x% Matrix::Diagonal(2, 3) 4 x 4 sparse Matrix of class "dtTMatrix" [1,] -9 . . . [2,] . -9 . . [3,] . . -9 . [4,] . . . -9 > - (Matrix::Diagonal(2, 3) %x% Matrix::Diagonal(2, 3)) Error in (function (cl, name, valueClass) : ‘factors’ is not a slot in class “dtTMatrix” The example is tested on: 1. Mac OS X, R 3.6.1, Matrix 1.2-18, and 2. Ubuntu 18.04.3 LTS, R 3.6.2, Matrix 1.2-18 Thanks.

Comments:

Message
Date: 2021-04-21 20:53 Sender: Martin Maechler Thank you, Chun Fung! Finally fixed this, svn commit 3385. Had nothing to do with kronecker but using `-` on a "dtTMatrix".

Field	Old Value	Date	By
status_id	Open	2021-04-21 20:53	mmaechler
close_date	None	2021-04-21 20:53	mmaechler
assigned_to	none	2021-04-21 20:53	mmaechler
summary	Error taking negation after kronecker product	2021-04-21 20:53	mmaechler
Severity	None	2021-04-21 20:53	mmaechler
Resolution	None	2021-04-21 20:53	mmaechler