From whuber at embl.de  Fri Feb 12 18:50:48 2010
From: whuber at embl.de (Wolfgang Huber)
Date: Fri, 12 Feb 2010 18:50:48 +0100
Subject: [Rd] Unexpected behaviour of x[i] when i is a matrix, on Windows
Message-ID: <4B7594F8.1070507@embl.de>

Hi,

when running the following on different instances of R (Linux and 
Windows), I get different results. The one for Linux seems to be the 
intended / documented one. When using numeric indices rather than 
characters, Windows seemed to behave as expected.

-----------On Windows--------------

x = matrix(FALSE, nrow=3, ncol=3)
colnames(x) = LETTERS[1:3]
rownames(x) = letters[1:3]
x

#       A     B     C
# a FALSE FALSE FALSE
# b FALSE FALSE FALSE
# c FALSE FALSE FALSE

x [ cbind("b", "B") ] = TRUE
x
                                                           b     B
# FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE  TRUE  TRUE

sessionInfo()

R version 2.10.0 (2009-10-26)
i386-pc-mingw32

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


-----------On Linux--------------
x = matrix(FALSE, nrow=3, ncol=3)
colnames(x) = LETTERS[1:3]
rownames(x) = letters[1:3]
x
#       A     B     C
# a FALSE FALSE FALSE
# b FALSE FALSE FALSE
# c FALSE FALSE FALSE
x [ cbind("b", "B") ] = TRUE
x
#       A     B     C
# a FALSE FALSE FALSE
# b FALSE  TRUE FALSE
# c FALSE FALSE FALSE

 > sessionInfo()
R version 2.11.0 Under development (unstable) (2010-02-12 r51125)
x86_64-unknown-linux-gnu

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=C              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 datasets  utils     methods   base

other attached packages:
[1] fortunes_1.3-7




-- 

Best wishes
      Wolfgang


--
Wolfgang Huber
EMBL
http://www.embl.de/research/units/genome_biology/huber/contact



[Rd] Unexpected behaviour of x[i] when i is a matrix, on Windows
Wolfgang Huber