On 26/02/2019 05:18, Brian Montgomery via R-devel wrote:
The following code crashes after about 300 iterations on my x86_64-w64-mingw32
machine on R 3.5.2 --vanilla.
Others have duplicated this (see
https://github.com/tidyverse/magrittr/issues/190 if necessary), but I don't
know how machine/OS-dependent it may be.
It crashes too on my Mageia6 (RPM based Linux distribution):
184 185 186 187
*** caught segfault ***
address 0x700000002, cause 'memory not mapped'
Possible actions:
1: abort (with core dump, if enabled)
2: normal R exit
3: exit R without saving workspace
4: exit R saving workspace
The crash can happen at different moments, sometimes after i=187 like in
the example above, sometimes after i=915. The error is not always
segfault. It can also be
915 Error in `[<-`(x, y == "a", x[y == "b"]) : replacement has length zero
or
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Error in
`[<-`(x, y == "a", x[y == "b"]) :
types (de raw a integer) incompatibles dans l'ajustement
d'affectation de type
(sorry, this crash was in french locale)
Hoping this helps.
Serguei.
> sessionInfo()
R version 3.5.2 (2018-12-20)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Mageia 6
Matrix products: default
BLAS/LAPACK: /home/opt/OpenBLAS/lib/libopenblas_sandybridge-r0.3.3.so
locale:
[1] C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.5.2
If it doesn't crash for you, please try increasing the length of the x vector.
Substituting the commented-out line for the one below it works correctly
(prints out 1:1000 and ends normally) every time.
x <- 1:200000
y <- rep(letters[1:5], length(x) / 5L)
for (i in 1:1000) {
# x[y == 'a'] <- x[y == 'b']
x <- `[<-`(x, y == 'a', x[y == 'b'])
cat(i, '')
}
cat('\n')
The point of using this syntax is to make it work better with pipes, but the
errors occur without pipes or magrittr.
Thank you for your help!
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