write.csv(..., col.names = FALSE) (PR#13202)

Dear Paul,

Thanks for your hint to write.table(). I have already chosen this route.

Note that if  row.names = FALSE, col.names gets TRUE and not NA.

    rn <- eval.parent(Call$row.names)
    Call$col.names <- if (is.logical(rn) && !rn)
        TRUE
    else NA

This is in contradiction to your citation and not very helpful, if one wants to append data to a file.

With best regards,
Stefan

____________________________________
Dr. Stefan Albrecht, CFA
Allianz Investment Management SE
AIM-GI-ALM
K?niginstr. 28 | 80802 Munich | Germany

Phone: +49.(0)89.3800.18317
Fax: +49.(0)89.3800.818317
EMail: stefan.albrecht at allianz.com


Allianz Investment Management SE
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-----Urspr?ngliche Nachricht-----
Von: Paul Roebuck [mailto:plroebuck at mdanderson.org] 
Gesendet: Monday, October 27, 2008 05:59
An: R Development Mailing List
Cc: Albrecht, Dr. Stefan (AIM SE)
Betreff: Re: [Rd] write.csv(..., col.names = FALSE) (PR#13202)

in write.csv() it is not possible to set both
row.names = FALSE, col.names = FALSE
since the col.names = FALSE gets overwritten:

write.csv

function (...)
{
    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[[1]] <- as.name("write.table")
    eval.parent(Call)
}
<environment: namespace:utils>

This is not documented and should be changed, as it is
an unintended reaction.

?write.csv

write.csv and write.csv2 provide convenience wrappers
for writing CSV files. They set sep, dec and qmethod,
and col.names to NA if row.names=TRUE and TRUE otherwise.

Seems documented to me.

Note that write.csv is just a wrapper for write.table.
If you don't like the wrapper, you could always call
write.table with its arguments set just as you want.

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