[datatable-help] Fwd: problems with modifying colnames
Michael Nelson
michael.nelson at sydney.edu.au
Fri Jul 25 04:41:19 CEST 2014
This is a known issue
https://github.com/Rdatatable/data.table/issues/512
________________________________________
From: datatable-help-bounces at lists.r-forge.r-project.org [datatable-help-bounces at lists.r-forge.r-project.org] on behalf of Francois Pepin [fpepin at gmail.com]
Sent: Friday, 25 July 2014 11:27 AM
To: datatable-help at lists.r-forge.r-project.org
Subject: [datatable-help] Fwd: problems with modifying colnames
Hi everyone,
I’m hitting a weird bug which I think might be data.table’s fault.
x<-data.table(a=1,b=2)
xn<-colnames(x)
xn
#[1] "a" "b"
x[,c:=3]
xn
[1] "a" "b" "c"
I would expect xn to stay the same value even if we change the columns in x.
There’s an easy workaround with copy(xn), but it’s weird and
surprising enough that I wanted to let others know about it.
Could someone check to see if this is reproducible? I’ll be happy to
file the bug report if it’s a genuine bug.
Thanks,
Francois
R version 3.1.0 (2014-04-10)
Platform: x86_64-unknown-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] data.table_1.9.3
loaded via a namespace (and not attached):
[1] plyr_1.8.1 Rcpp_0.11.2 reshape2_1.4 stringr_0.6.2
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