From richard_raubertas at merck.com  Thu Jun 27 19:29:46 2013
From: richard_raubertas at merck.com (Raubertas, Richard)
Date: Thu, 27 Jun 2013 13:29:46 -0400
Subject: [Rd] 'modifyList' drops (not adds) NULL components
Message-ID: <1D693EC430D9BA40A64CB59875BED8CF013447FF8464@USCTMXP51004.merck.com>

Dear list,

Utils::modifyList() drops NULL components in its second argument, instead of adding them to the first argument.  Compare:
> modifyList(x=list(A=1), val=list(B=2, C=3))
$A
[1] 1

$B
[1] 2

$C
[1] 3

> modifyList(x=list(A=1), val=list(B=NULL, C=3))
$A
[1] 1

$C
[1] 3

To me this seems inconsistent with the documentation ("Elements in 'val' which are missing from 'x' are added to 'x'."), and also with how I'd want the function to behave.

> sessionInfo()
R version 3.0.1 Patched (2013-06-16 r62969)
Platform: x86_64-w64-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252 
[2] LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     


Richard Raubertas
Merck & Co.


Notice:  This e-mail message, together with any attachme...{{dropped:11}}



[Rd] 'modifyList' drops (not adds) NULL components
Raubertas, Richard