[R] New behavior of 'write.csv' append argument?

[jim holtman]

As noted in the help file under CSV files:

These wrappers are deliberately inflexible: they are designed to
ensure that the correct conventions are used to write a valid file.
Attempts to change append, col.names, sep, dec or qmethod are ignored,
with a warning.



On Mon, May 31, 2010 at 8:33 PM, Steven Worthington
<steven.worthington at gmail.com> 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)
> # --------------------------------
>
> best,
>
> Steve
> --
> View this message in context: http://r.789695.n4.nabble.com/New-behavior-of-write-csv-append-argument-tp2237936p2237936.html
> Sent from the R help mailing list archive at Nabble.com.
>
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?