[R] append with write.table()
andy_liaw at merck.com
Mon Apr 29 14:52:43 CEST 2002
If you are on an Unix or Linux system (or have the cygwin tools under
Windoze), you can write it to a separate file, then use 'paste' to join them
column-wise at the shell.
> -----Original Message-----
> From: Ulrich Leopold [mailto:uleopold at science.uva.nl]
> Sent: Monday, April 29, 2002 7:59 AM
> To: ripley at stats.ox.ac.uk
> Cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] append with write.table()
> >>I get the following message while trying to append an
> object to a file.
> > You are writing a data frame to a file. You have asked that
> the column
> > names be written out. That makes little sense in the
> middle of the file,
> > so you get a warning. Appending is (more-or-less) only
> useful to add rows
> > to an existing data frame on a file.
> >>In addition it is not appended. Do you know why?
> > No, but then you haven't given us anything much to go on.
> > Here's a working example:
> >>write.table(hills[1:20,], "hills.dat", quote=FALSE, sep="\t")
> >>write.table(hills[22:25,], "hills.dat", quote=FALSE, sep="\t",
> > append=TRUE, col.names=FALSE)
> >>write.table(PoxAv, "/home/uleopold/lsk_PoxAv", append=TRUE ,
> >>quote=FALSE, sep="\t")
> >>Warning message:
> >>appending column names to file in: write.table(PoxAv,
> >>"/home/uleopold/lsk_PoxAv", append = TRUE,
> >>Ulrich Leopold MSc.
> Thanks Brian for pointing out.I think was wrong in what I
> wanted to do.
> I wanted to append columns not rows. I thought it is possible
> with that command.
> Is there a command which is similar to that but adding
> columns to a file or an object?
> Ulrich Leopold MSc.
> Department of Physical Geography
> Institute for Biodiversity and Ecosystem Dynamics
> Faculty of Science
> University of Amsterdam
> Nieuwe Achtergracht 166
> NL-1018WV Amsterdam
> Phone: +31-(0)20-525-7456 (7451 Secretary)
> Fax: +31-(0)20-525-7431
> Email: uleopold at science.uva.nl
> Check us also out at:
> Netherlands Centre for Geo-ecological Research
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