[R] write.csv and col.names=F

[kayj]

Hi All,

I always have a problem with write.csv when I want the column names to be
ignored, when I specify col.names=F, I get a header of V1 V2 V3 V4 etc.

for example I tried

write.csv(mydata, file="data.csv", quote=FALSE, row.names=F, col.names=F)
Warning message:
In write.csv(mydata, file = "data.csv", quote = FALSE, :
attempt to set 'col.names' ignored
how can I get rid of this problem ? I do not want the header of V1 V2 V3...
to appear in my output file,

Thanks

[milton ruser]

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[Gabor Grothendieck]

Use write.table instead.

Post by kayj
Hi All,
I always have a problem with write.csv when I want the column names to be
ignored, when I specify col.names=F, I get a header of V1 V2 V3 V4 etc.
for example I tried
write.csv(mydata, file="data.csv", quote=FALSE, row.names=F, col.names=F)
?attempt to set 'col.names' ignored
how can I get rid of this problem ? I do not want the header of V1 V2 V3...
to appear in my output file,
Thanks
--
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[Reeyarn_李智洋_10928113]

Post by kayj
Hi All,
I always have a problem with write.csv when I want the column names to be
ignored, when I specify col.names=F, I get a header of V1 V2 V3 V4 etc.

I tried that and found the same problem, however, I found
write.table(mydata, file="data.csv",col.names=F)
works.

write.csv calls write.table to save data, is there something wrong with it?

--
Best Regards,
Reeyarn T. Lee

[jim holtman]

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[Don MacQueen]

At 9:37 PM +0800 12/18/09,

Post by Reeyarn_李智洋_10928113

Post by kayj
Hi All,
I always have a problem with write.csv when I want the column names to be
ignored, when I specify col.names=F, I get a header of V1 V2 V3 V4 etc.

I tried that and found the same problem, however, I found
write.table(mydata, file="data.csv",col.names=F)
works.
write.csv calls write.table to save data, is there something wrong with it?

No.

If you read the help page you will find that it answers your question. It says:

'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.

Notice that it sets col.names for you.
If you want full control, use write.table().
If you want to write a table in a commonly used and pre-defined
format (and without having to worry about various options) use
write.csv().

That's why it is a called "convenience wrapper".

-Don

Post by Reeyarn_李智洋_10928113
--
Best Regards,
Reeyarn T. Lee
______________________________________________
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https://*stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://*www.*R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.