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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--
Sent from my phone. Please excuse my brevity.
______________________________________________
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