On Feb 8, 2012, at 2:29 PM, Ron Michael wrote:
Okay, so I understood that appending can only happen row-wise.
Therefore I tried with following code:
write.csv(matrix(1:5, 1), "dat.csv")
write.csv(matrix(1:5, 1), "dat.csv", append = TRUE)
Warning message:
In write.csv(matrix(1:5, 1), "dat.csv", append = TRUE) :
attempt to set 'append' ignored
It is destroying my previous file. Where I have done wrong?
Failed to read the help page. `write.csv` has some of its setting hard
coded and will prevent you from changing them. "append" happened to be
in that list.
Here's the code.... it's right there for all to see:
Call <- match.call(expand.dots = TRUE)
for (argname in c("append", "col.names", "sep", "dec",
"qmethod")) if (!is.null(Call[[argname]]))
warning(gettextf("attempt to set '%s' ignored", argname),
domain = NA)
--
David.
Thanks,
----- Original Message -----
From: Uwe Ligges <lig...@statistik.tu-dortmund.de>
To: Ron Michael <ron_michae...@yahoo.com>
Cc: "r-help@r-project.org" <r-help@r-project.org>
Sent: Thursday, 9 February 2012 1:07 AM
Subject: Re: [R] Wriritng to a CSV file
On 08.02.2012 20:14, Ron Michael wrote:
Dear all, let say I want to write a vector to a CSV file. So I can
have following syntax:
write.csv(rnorm(10), "dat.csv")
Now I want to add one more column into that existing file. If I use
the same code then existing file will be destroyed. Is there any
functionality to add without destroying the existing file? I have
tries with 'append = TRUE' however it is not working!
Any suggestion will be highly appreciated.
Since these text files are written line by line, you cannot add a
column
afterwards, you can just append rows.
Hence read the first column and write a two column data.frame
afterwards.
Uwe Ligges
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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David Winsemius, MD
West Hartford, CT
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