[R] Partial matching list elements in R 4.0

[Bert Gunter]

?identical
?rapply might also be useful to get more granular diagnostics. (??)


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 Wed, May 27, 2020 at 1:13 PM John Harrold <john.m.harrold using gmail.com>
wrote:

> Thankyou Bert and Bill.
>
> I have one last question. Is there a tool that will recursively compare two
> lists to find differences in both their structure and contents?
>
> I'm afraid that in the process of converting code from $ to [[]] formats I
> may inadvertently introduce some errors. And I'd like to QC it in some way.
>
> Thanks
> John
>
> On Tue, May 26, 2020 at 11:33 AM William Dunlap <wdunlap using tibco.com> wrote:
>
> > Another symptom of this problem is:
> >
> > > {x <- list(Abc=list(Pqr="Old Abc$Pqr")); x$Ab$Pqr <- "New Ab$Pqr" ; x}
> > R version 3.6.2 (2019-12-12) | R version 4.0.0 (2020-04-24)
> > List of 2                    | List of 2
> >  $ Abc:List of 1             |  $ Abc:List of 1
> >   ..$ Pqr: chr "Old Abc$Pqr" |   ..$ Pqr: chr "New Ab$Pqr"
> >  $ Ab :List of 1             |  $ Ab :List of 1
> >   ..$ Pqr: chr "New Ab$Pqr"  |   ..$ Pqr: chr "New Ab$Pqr"
> >
> > Bill Dunlap
> > TIBCO Software
> > wdunlap tibco.com
> >
> >
> > On Tue, May 26, 2020 at 10:45 AM John Harrold <john.m.harrold using gmail.com>
> > wrote:
> >
> >> Hello,
> >>
> >>
> >> I'm testing some code in R 4.0, and I'm having an issue with the
> >> following"
> >>
> >> # -------------
> >> rm(list=ls())
> >> graphics.off()
> >> #load("/tmp/post.RData")
> >> var = list();
> >> # If I uncomment this it fixes things:
> >> # var$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
> >>
> >>         [[alternative HTML version deleted]]
> >>
> >> ______________________________________________
> >> R-help using 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.
> >>
> >
>
> --
> John
> :wq
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help using 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.
>

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