Hello,

> write.csv(df, row.names=TRUE, col.names=c("ID", colnames(df)))
"","a","b"
"A",1,3
"B",2,4
"C",3,5
Warning message:
In write.csv(df, row.names = TRUE, col.names = c("ID", colnames(df))) :
  attempt to set 'col.names' ignored

This gives a warning, not an error message. I've also tried setting col.names = NA, and the same warning message is given. Why I don't know, according to the help page ?write.csv the default behavior should be overriden.

Hope this helps,

Rui Barradas

Em 19-03-2014 11:01, Luca Cerone escreveu:
Thanks Ista,
sorry it was a typo in my email, but in the code I have the right option.

On Wed, Mar 19, 2014 at 11:58 AM, Ista Zahn <istaz...@gmail.com> wrote:
The argument is "col.names", not "colnames".

Best,
Ista

On Mar 19, 2014 6:14 AM, "Luca Cerone" <luca.cer...@gmail.com> wrote:

Hi everybody,
I am sorry if this is a silly question (I have tried to search it at
http://tolstoy.newcastle.edu.au/R/ but I get a 404 page).

I have a script writing some data.frames to csv files.
I write the csv files using the write.csv function and the option
row.names=TRUE.
Everything works fine, except that I am not able to set the name of
the column holding the row.names.

For example I tried to set the column name to ID like this:

     df = data.frame(a=c(1,2,3), b=c(3,4,5))
     rownames(df) = c("A","B","C")

     write.csv(df, row.names=TRUE, colnames=c("ID", colnames(df)))

This fails with the following error:
     Error in write.table(df, row.names = TRUE, colnames = c("ID",
colnames(df)),  :
           unused argument (colnames = c("ID", colnames(df)))

How can I do this? I have tried to use write.table() as well, but it
seems I never get to set the options right.

Thanks a lot in advance for the help,

Cheers,
Luca

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