>>>>> Serguei Sokol
>>>>> on Wed, 19 Feb 2020 15:21:21 +0100 writes:
> Hi,
> I was bitten by a little incoherence in dimnames assignment or may be I
> missed some point.
> Here is the case. If I assign row names via dimnames(a)[[1]], when
> nrow(a)=1 then an error is thrown. But if I do the same when nrow(a) > 1
> it's OK. Is one of this case works unexpectedly? Both? Neither?
> a=as.matrix(1)
> dimnames(a)[[1]]="a" # error: 'dimnames' must be a list
> aa=as.matrix(1:2)
> dimnames(aa)[[1]]=c("a", "b") # OK
> In the second case, dimnames(aa) is not a list (like in the first case)
> but it works.
> I would expect that the both work or neither.
I agree (even though I'm strongly advising people to use '<-'
instead of '=');
which in this case helps you get the name of the function really
involved: It is `dimnames<-` (which is implemented in C
entirely, for matrices and other arrays).
> Your thoughts are welcome.
I think we'd be happy if you report this formally on R's
bugzilla - https://bugs.r-project.org/ - as a bug.
--> https://www.r-project.org/bugs.html
>From reading bugs.html you note that you should ask for an account there;
as I'm one of the people who get such request by e-mail, in this
case, I can do it directly (if you confirm you'd want in a
private e-mail).
> Best,
> Serguei.
> PS the same apply for dimnames(a)[[2]]<-.
(of course)
NB *and* importantly, the buglet is still in current versions of R
Best,
Martin
>> sessionInfo()
> R version 3.6.1 (2019-07-05)
> Platform: x86_64-pc-linux-gnu (64-bit)
> Running under: Mageia 7
> Matrix products: default
> BLAS/LAPACK: /home/opt/OpenBLAS/lib/libopenblas_sandybridge-r0.3.6.so
> locale:
> [1] LC_CTYPE=fr_FR.UTF-8 LC_NUMERIC=C
> [3] LC_TIME=fr_FR.UTF-8 LC_COLLATE=fr_FR.UTF-8
> [5] LC_MONETARY=fr_FR.UTF-8 LC_MESSAGES=fr_FR.UTF-8
> [7] LC_PAPER=fr_FR.UTF-8 LC_NAME=C
> [9] LC_ADDRESS=C LC_TELEPHONE=C
> [11] LC_MEASUREMENT=fr_FR.UTF-8 LC_IDENTIFICATION=C
> attached base packages:
> [1] parallel stats graphics grDevices utils datasets methods
> [8] base
> other attached packages:
> [1] multbxxc_1.0.1 rmumps_5.2.1-11
> [3] arrApply_2.1 RcppArmadillo_0.9.800.4.0
> [5] Rcpp_1.0.3 slam_0.1-47
> [7] nnls_1.4
> loaded via a namespace (and not attached):
> [1] compiler_3.6.1 tools_3.6.1 codetools_0.2-16
> ______________________________________________
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