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2025 Feb 12
1
Unexpected result after auto-attaching of the Matrix package
.../main/objects.c#L493
6. R_data_class2() sees it's an S4 object and calls
methods:::.extendsForS3(class(d)), which finally loads Matrix in order
to find out classes extended by "dgCMatrix":
https://github.com/r-devel/r-svn/blob/fa73948a1977da05788499807469e69d5a21bd98/src/main/attrib.c#L840
https://github.com/r-devel/r-svn/blob/fa73948a1977da05788499807469e69d5a21bd98/src/main/attrib.c#L736-L741
7. S3 dispatch fails for all those S4 classes or the "default" method,
so dim(d) returns attr(d, "dim") (which is not set):
https://github.com/r-devel/r-svn/blob/fa73948a19...
2025 Feb 11
2
Unexpected result after auto-attaching of the Matrix package
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