Hi Jeff,
you are obviously right and I would usually load packages before, but in
this case it was a saved R object that I had not created, and therefore
did not know what to expect.
I was prepared to get an error message, but not getting an error or at
least a warning and then getting the wrong result was kind of unexpected.
Best regards
Hilmar
On 12.02.25 03:02, Jeff Newmiller wrote:
Why aren't you loading the package before you load the object that assumes the
relevant methods for that object are available?
On February 11, 2025 4:51:48 AM PST, H B via R-help <r-help@r-project.org>
wrote:
Dear all,
I just stumbled on this behavior - not sure if this is expected:
R version 4.4.2 (2024-10-31) -- "Pile of Leaves"
Copyright (C) 2024 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu
library(Matrix)
sparseMatrix(i=1:10, j=1:10, x=rnorm(10)) |>
saveRDS("~/Downloads/sparsemat_test.rds")
q()
Save workspace image? [y/n/c]: n
# start R again
d <- readRDS("~/Downloads/sparsemat_test.rds")
class(d)
[1] "dgCMatrix"
attr(,"package")
[1] "Matrix"
dim(d)
Loading required package: Matrix
NULL
dim(d)
[1] 10 10
So the first call to dim(d) loads/attaches the Matrix package but
returns NULL for the call. Only the second call to dim returns the
correct results. I would expect the first call to succeed also,
otherwise what is the purpose of loading the package?
Best regards
Hilmar
sessionInfo()
R version 4.4.2 (2024-10-31)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 24.04.1 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.12.0
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.12.0
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=de_DE.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=de_DE.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=de_DE.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=de_DE.UTF-8 LC_IDENTIFICATION=C
time zone: Europe/Berlin
tzcode source: system (glibc)
attached base packages:> sessionInfo()
R version 4.4.2 (2024-10-31)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 24.04.1 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.12.0
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.12.0
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=de_DE.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=de_DE.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=de_DE.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=de_DE.UTF-8 LC_IDENTIFICATION=C
time zone: Europe/Berlin
tzcode source: system (glibc)
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] Matrix_1.7-2
loaded via a namespace (and not attached):
[1] compiler_4.4.2 grid_4.4.2 lattice_0.22-5
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] Matrix_1.7-2
loaded via a namespace (and not attached):
[1] compiler_4.4.2 grid_4.4.2 lattice_0.22-5
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______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide https://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
