R help - Jul 2010 - write.csv() : attempt to set 'append' ignored... Why?

I'm running R 2.11.0 on a 32-bit Windows XP machine.  Whenever I try to
write
a csv file with 'append' set to TRUE, I get this message: attempt to set
'append' ignored.

Obviously, this is no good, since R is deleting my previously saved data
files, rather than appending to them.  What can I do to fix this?
-- 
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On Jul 15, 2010, at 9:41 AM, Cliff Clive wrote:
> 
> I'm running R 2.11.0 on a 32-bit Windows XP machine.  Whenever I try to
write
> a csv file with 'append' set to TRUE, I get this message: attempt
to set
> 'append' ignored.
> 
> Obviously, this is no good, since R is deleting my previously saved data
> files, rather than appending to them.  What can I do to fix this?

Read ?write.csv more carefully:

In the "CSV files" section:

These wrappers are deliberately inflexible: they are designed to ensure that the
correct conventions are used to write a valid file. Attempts to change append,
col.names, sep, dec or qmethod are ignored, with a warning.


If you want to use 'append', you will need to use write.table() and
adjust the other arguments as you require.

HTH,

Marc Schwartz

Use write.table() instead.  

I thought that I had used write.csv() with an append before but I cannot find an
example. Perhaps append= is not available in write.csv



--- On Thu, 7/15/10, Cliff Clive <cliffclive at gmail.com> wrote:
> From: Cliff Clive <cliffclive at gmail.com>
> Subject: [R] write.csv() : attempt to set 'append' ignored... Why?
> To: r-help at r-project.org
> Received: Thursday, July 15, 2010, 10:41 AM
> 
> I'm running R 2.11.0 on a 32-bit Windows XP machine.?
> Whenever I try to write
> a csv file with 'append' set to TRUE, I get this message:
> attempt to set
> 'append' ignored.
> 
> Obviously, this is no good, since R is deleting my
> previously saved data
> files, rather than appending to them.? What can I do
> to fix this?
> -- 
> View this message in context:
http://r.789695.n4.nabble.com/write-csv-attempt-to-set-append-ignored-Why-tp2290254p2290254.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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