On 2010-05-31 18:33, Steven Worthington wrote:
Dear R users,
I have recently begun to reuse some functions I made several months ago. The
scripts write to a .csv file using the 'write.csv' function with the append
option set to TRUE. This used to work fine, albeit with the warning
"appending column names to file". I upgraded to R version 2.11.0 on OSX
10.5.8 and 'write.csv' will no longer append any files - I get the warning
"attempt to set 'append' ignored". The exact same object will append when
using 'write.table' without issue. Here's a minimal example. Has there been
a change in 'write.csv'?
# --------------------------------
x<- rnorm(10, 5)
y<- rnorm(10, 10)
z<- rnorm(10, 15)
dat<- data.frame(x, y, z)
names(dat)<- c("first", "second", "third")
write.csv(dat, file="dat.csv", append=TRUE)
write.table(dat, file="dat2.csv", sep=",", row.names=FALSE, append=TRUE)
# --------------------------------
It's always a good idea to check the NEWS file. Here is a quote:
"write.csv[2] no longer allow 'append' to be changed: as ever,
direct calls to write.table() give more flexibility as well as
more room for error."
So use write.table.
-Peter Ehlers
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