Touche -- perhaps we could make one though?

write.csv.append <- function(..., append = TRUE)
{
    Call <- match.call(expand.dots = TRUE)
    for (argname in c("col.names", "sep", "dec", "qmethod")) if
(!is.null(Call[[argname]]))
        warning(gettextf("attempt to set '%s' ignored", argname),
            domain = NA)
    rn <- eval.parent(Call$row.names)
    Call$col.names <- if (is.logical(rn) && !rn)
        TRUE
    else NA
    Call$sep <- ","
    Call$dec <- "."
    Call$qmethod <- "double"
    Call[[1L]] <- as.name("write.table")
    eval.parent(Call)
}
write.csv.append(1:5,"test.csv", append = FALSE)
write.csv.append(1:15, "test.csv")

Output seems a little sloppy, but might work for the OP.

Michael Weylandt

On Wed, Sep 21, 2011 at 9:03 AM, Ivan Calandra <ivan.calandra@uni-hamburg.de
> wrote:

> I don't think there is an append argument to write.csv() (well, actually
> there is one, but set to FALSE).
> There is however one to write.table()
> Ivan
>
> Le 9/21/2011 14:54, R. Michael Weylandt <michael.weylandt@gmail.com> a
> écrit :
>
>  The append argument of write.csv()?
>>
>> Michael
>>
>> On Sep 21, 2011, at 8:01 AM, "Ashish Kumar"<ashish.kumar@**
>> esteeadvisors.com <ashish.kumar@esteeadvisors.com>>  wrote:
>>
>>  Hi,
>>>
>>>
>>>
>>> I wanted to write the data created using R  on existing csv file. However
>>> everytime I use write.csv, it overwrites the values already there in the
>>> existing csv file. Any workaround on this.
>>>
>>>
>>>
>>> Thanks for your help
>>>
>>>
>>>
>>> Ashish Kumar
>>>
>>>
>>>
>>> Estee Advisors Pvt. Ltd.
>>>
>>> Email: ashish.kumar@esteeadvisors.com
>>>
>>> Cell: +91-9654072144
>>>
>>> Direct: +91-124-4637-713
>>>
>>>
>>>
>>>
>>>    [[alternative HTML version deleted]]
>>>
>>> ______________________________**________________
>>> R-help@r-project.org mailing list
>>> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help>
>>> PLEASE do read the posting guide http://www.R-project.org/**
>>> posting-guide.html <http://www.R-project.org/posting-guide.html>
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>> ______________________________**________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help>
>> PLEASE do read the posting guide http://www.R-project.org/**
>> posting-guide.html <http://www.R-project.org/posting-guide.html>
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
> --
> Ivan CALANDRA
> PhD Student
> University of Hamburg
> Biozentrum Grindel und Zoologisches Museum
> Dept. Mammalogy
> Martin-Luther-King-Platz 3
> D-20146 Hamburg, GERMANY
> +49(0)40 42838 6231
> ivan.calandra@uni-hamburg.de
>
> **********
> http://www.for771.uni-bonn.de
> http://webapp5.rrz.uni-**hamburg.de/mammals/eng/1525_8_**1.php<http://webapp5.rrz.uni-hamburg.de/mammals/eng/1525_8_1.php>
>
>
> ______________________________**________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help>
> PLEASE do read the posting guide http://www.R-project.org/**
> posting-guide.html <http://www.R-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>

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