write.csv ignores 'row.names'

Okay, upon further examination, it appears that it works fine if you set 
'row.names = FALSE' as opposed to 'row.names = F'.

-roger

Roger Peng wrote:

Upon replying to this email, I took a look at 'write.csv()' and noticed 
something interesting.  I remember there being a discussion sometime in 
the past about letting 'write.csv()' accept the 'row.names' argument. 
However, I get the following error:

 > write.csv(airquality, file = "myfile.csv", row.names = F)

Error in write.table(airquality, file = "myfile.csv", row.names = F, 
col.names = NA,  :
        col.names = NA makes no sense when row.names = FALSE

 >

In 'write.csv()' there is

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

but is.logical(rn) is always FALSE because even if 'row.names' is 
specified (non-NULL), it is of class "name".  Perhaps something like

rn <- eval(Call$row.names)

would suffice?  I can't tell if that would break anything.

-roger

Sven Schaltenbrand wrote:

hallo,
 
i have a problem by writing a csv file
the first colum is filled with index numbers from 1 to n.
i have to unique two csv files once a week while one file is always the
same.
can anybody tell me, how to write the dataset into a csv file without the
first row of the indexnumbers.
x[,-1] does not wok as it eliminates the first "interesting" colum.
col.names is not accepted by r (do i habe to start a package first? which
one?)
 
thx
 
sven

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