Dear All!
Reading character strings containing an "umlaut"
from a csv-file I find a (to me) surprising
behaviour in R 2.8.0, that I did not notice in R 2.7.2.
A comparison by "==" results in FALSE, while grep does find the aggreement.
See the example below.
The crucial line is x=="div 1-2 Veränderungen",
with the result [1] FALSE in R 2.8.0 but
[1] TRUE in R 2.7.2.
Thank you in advance for your help
Heinz Tüchler
##### in R 2.8.0 patched
x0 <- "div 1-2 Veränderungen" # define a character string
write.csv(x0, 'chr.csv', row.names=FALSE) # write a csv-file with one line
rm(x0)
x <- read.csv('chr.csv', skip=0, header=TRUE, as.is=TRUE)$x # read in csv-file
x
x=="div 1-2 Veränderungen"
> [1] FALSE
grep("div 1-2 Veränderungen", x)
> [1] 1
grep("div 1-2 Veränderungen", x, value=TRUE)
> [1] "div 1-2 Veränderungen"
unlink('chr.csv') # delete file
Version:
platform = i386-pc-mingw32
arch = i386
os = mingw32
system = i386, mingw32
status = Patched
major = 2
minor = 8.0
year = 2008
month = 11
day = 04
svn rev = 46830
language = R
version.string = R version 2.8.0 Patched (2008-11-04 r46830)
Windows XP (build 2600) Service Pack 2
Locale:
LC_COLLATE=German_Austria.1252;LC_CTYPE=German_Austria.1252;LC_MONETARY=German_Austria.1252;LC_NUMERIC=C;LC_TIME=German_Austria.1252
Search Path:
.GlobalEnv, package:stats, package:graphics,
package:grDevices, package:utils,
package:datasets, package:methods, Autoloads, package:base
##### in R 2.7.2 patched
x0 <- "div 1-2 Veränderungen" # define a character string
write.csv(x0, 'chr.csv', row.names=FALSE) # write a csv-file with one line
rm(x0)
x <- read.csv('chr.csv', skip=0, header=TRUE, as.is=TRUE)$x # read in csv-file
x
x=="div 1-2 Veränderungen"
> [1] TRUE
grep("div 1-2 Veränderungen", x)
> [1] 1
grep("div 1-2 Veränderungen", x, value=TRUE)
> [1] "div 1-2 Veränderungen"
unlink('chr.csv') # delete file
Version:
platform = i386-pc-mingw32
arch = i386
os = mingw32
system = i386, mingw32
status = Patched
major = 2
minor = 7.2
year = 2008
month = 09
day = 02
svn rev = 46486
language = R
version.string = R version 2.7.2 Patched (2008-09-02 r46486)
Windows XP (build 2600) Service Pack 2
Locale:
LC_COLLATE=German_Austria.1252;LC_CTYPE=German_Austria.1252;LC_MONETARY=German_Austria.1252;LC_NUMERIC=C;LC_TIME=German_Austria.1252
Search Path:
.GlobalEnv, package:stats, package:graphics,
package:grDevices, package:utils,
package:datasets, package:methods, Autoloads, package:base
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