[R-pkg-team] Bug#980809: Matrix package default tolerance on s390x (Re: Bug#980809: rmatrix: breaks autopkgtest of r-cran-glmmtmb on s390x)

[Martin Maechler]

Dear Dirk,
I'm in vacations right now ...

1)  I think I might simply disable the check  *on* that platform .. or
platforms with similar characteristics.
Can you send me the outputs of  so I can take some of the entries to
determine I'm on the platform?

sessionInfo()
str(.Machine, digits=10)
capabilities()
.Platform

2)  Can you send me the  result of     rankMatrix(Z, method="qr")
i.e.  `rnkZ.`  from the above example ?

Best, Martin

On Mon, Feb 15, 2021 at 5:12 PM Dirk Eddelbuettel <edd at debian.org> wrote:
>
>
> Martin,
>
> I have this long-running bug report against Matrix, triggered by glmmTMB on
> s390x.  Graham has been chasing this patiently and we are now at the level of
> checking on a shell account on the appropriate hardware.
>
> We validated that everything does in fact "still break" with CRAN-current
> packages of everything (and R 4.0.3, I guess by tomorrow we'd have 4.0.4).
>
> glmmTMB does indeed fail in an example -- but so does Matrix 1.3-2 when I run
>
>   _R_CHECK_FORCE_SUGGESTS_=false R CMD check \
>                      --no-manual --no-vignettes Matrix_1.3-2.tar.gz
>
> and I see
>
>   [...]
>   Running 'factorizing.R'
>  ERROR
> Running the tests in 'tests/factorizing.R' failed.
> Last 13 lines of output:
>   +     inherits(qrZ, "sparseQR")
>   +     inherits(Rz, "sparseMatrix")
>   +     isTriangular(Rz)
>   +     isDiagonal(Rz) # even though formally a "dtCMatrix"
>   +     qr2rankMatrix(qrZ, do.warn=FALSE) == 6
>   + })
>   > options(oo)
>   >
>   > ## problematic rank deficient rankMatrix() case -- only seen in large cases ??
>   > Z. <- readRDS(system.file("external", "Z_NA_rnk.rds", package="Matrix"))
>   > tools::assertWarning(rnkZ. <- rankMatrix(Z., method = "qr")) # gave errors
>   Error in assertCondition(expr, classes, .exprString = d.expr) :
>     Failed to get warning in evaluating rnkZ. <- rankMatrix(Z., method  ...
>   Calls: <Anonymous> -> assertCondition
>   Execution halted
> * checking for unstated dependencies in vignettes ... OK
>
> Can you advise if I should dive into a particular routine or comparison to
> see what is up here?
>
> Best,  Dirk
>
> --
> https://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>


-- 
Martin Maechler,
Seminar fuer Statistik, ETH Zurich