There is a modifyList function in pkg utils that is used extensively in
the code for lattice graphics:
var$options <- modifyList(var$options, list( misc=list(abc = "123"),
mi= list(something = 13))
)
#-------------------
> var
$options
$options$mi
$options$mi$something
[1] 13
$options$misc
$options$misc$abc
[1] "123"
On 5/26/20 11:31 AM, Bert Gunter wrote:
I can't answer your question (about your R programming skills) but the
behavior you complain about is as documented. In particular:
"Thus the default behaviour is to use partial matching only when extracting
from recursive objects (except environments) by $. Even in that case,
warnings can be switched on by options
<http://127.0.0.1:39592/help/library/base/help/options>(warnPartialMatchDollar
= TRUE)."
So the solution is not to use $ for list extraction/replacement. Though
convenient, it is prone to such issues. Instead, the following works (as
does your suggested solution, of course):
var <- list()
var[["options"]][["misc"]][["abc"]] <- "123"
var[["options"]][["mi"]][["something"]] <- 13
var
$options
$options$misc
$options$misc$abc
[1] "123"
$options$mi
$options$mi$something
[1] 13
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, May 26, 2020 at 10:45 AM John Harrold <john.m.harr...@gmail.com>
wrote:
Hello,
I'm testing some code in R 4.0, and I'm having an issue with the following"
# -------------
rm(list=ls())
graphics.off()
#load("/tmp/post.RData")
var = list();
# If I uncomment this it fixes things:
# var$options = list(mi = list(),
# misc = list())
#
var$options$misc$abc = "123"
var$options$mi$something = 13
#------------
This is a stripped down example but it exhibits the issue I"m having.
Basically when I create the list element var$options$mi the contents of
var$options$misc move over to var$options$mi. And what was in
var$options$misc become NULL:
So now var$options looks like:
var$options
$misc
$misc$abc
NULL
$mi
$mi$abc
[1] "123"
$mi$something
[1] 13
This worked (still works) in R 3.5.1. I understand partial matching, but is
this normal lists moving over to elements like this? I can uncomment the
text mentioned in the example and it seems to fix it, but I'm wondering if
this is a bug or just my poor programming coming back to bite me.
I've included my sessionInfo() at the bottom.
Thanks
John
:wq
sessionInfo()
R version 4.0.0 (2020-04-24)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Mojave 10.14.5
Matrix products: default
BLAS:
/Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRblas.dylib
LAPACK:
/Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] gdata_2.18.0 ggplot2_3.3.0 deSolve_1.28
loaded via a namespace (and not attached):
[1] Rcpp_1.0.4.6 gtools_3.8.2 withr_2.2.0 assertthat_0.2.1
[5] dplyr_0.8.5 digest_0.6.25 crayon_1.3.4 grid_4.0.0
[9] R6_2.4.1 lifecycle_0.2.0 gtable_0.3.0 magrittr_1.5
[13] scales_1.1.1 pillar_1.4.4 rlang_0.4.6 vctrs_0.3.0
[17] ellipsis_0.3.1 glue_1.4.1 purrr_0.3.4 munsell_0.5.0
[21] compiler_4.0.0 pkgconfig_2.0.3 colorspace_1.4-1 tidyselect_1.1.0
[25] tibble_3.0.1
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https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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 http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
