On Tue, 4 Apr 2000 edd@debian.org wrote:
> Full_Name: Dirk Eddelbuettel
> Version: 1.0.0 (patched)
> OS: Linux
> Submission from: (NULL) (192.139.71.69)
>
>
> A frame with rownames and colnames got properly written, but the colnames
> started
> without an offset -- but if the .csv file is read back in, the rownames
column
> now
> has the header of the first column.
>
> "Graphically", suppose a frame with two rows 1999 and 2000, and
two columns foo
> and
> bar, with content equal to the row/col index.
>
> This should be written as
>
> ,foo,bar
> 1999,11,12
> 2000,21,22
>
> but was written without the initial "," (I used "," as
the sep).
>
> Am I making sense?
In the S convention, the header is regarded as separate, with a potentially
different format from the rest of the file. If I have
auk% cat test.csv
foo,bar
1999,11,12
2000,21,22
then
> read.table("test.csv", sep=",")
foo bar
1999 11 12
2000 21 22
works, as does test <- read.csv("test.csv"). If I then do
> write.table(test, "test2.csv", sep=",", quote=F)
I get
auk% cat test2.csv
foo,bar
1999,11,12
2000,21,22
as before, so it seems that this is working as expected. Can you give the
actual example you used that fails? There are a lot of other things which
can potentially go wrong, including the quote setting (and I had to use
quote=F to approximate the file you quote).
Note that when I read your suggested correction with read.table/read.cvs I
get
NA foo bar
1 1999 11 12
2 2000 21 22
unless I use read.csv("test2.csv", row.names=1).
--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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