[R] append with write.table()

[Liaw, Andy]

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.

Andy

> -----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:
> > 
> > 
> >>library(MASS)
> >>data(hills)
> >>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
> 
> 
> -- 
> __________________________________________________
> 
> 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
> http://www.frw.uva.nl/soil/Welcome.html
> 
> Check us also out at:
> Netherlands Centre for Geo-ecological Research
> http://www.frw.uva.nl/icg
> 
> 
> 
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