Ok I will try that. I think I set it to False when I tried it the first
time, maybe that was my mistake

On Mon, May 3, 2010 at 3:28 PM, Ista Zahn <istazahn@gmail.com> wrote:

> Hi Steve,
> I think you just need to set col.names = FALSE (instead of col.names
> =NULL) on subsequent writes.
>
> -Ista
>
> On Mon, May 3, 2010 at 5:19 PM, steven mosher <moshersteven@gmail.com>
> wrote:
> > The situation arises where I open a file to write a data.frame to it.
> with
> > write.table.
> >
> > multiple lines are written to the file and the file is kept in
> Append=TRUE
> > mode.
> >
> > If one sets the col.names to the names of the variables being written,
>  you
> > have output
> > that looks like this...
> >
> > name1 name2  name3.....
> >
> >  x          x         x
> >  x          x         x
> >  x          x         x
> > name1  name2  name 3
> >  x          x         x
> >  x          x         x
> >  x          x         x
> >
> > And so forth as each time write is called, the col.names are written.
> >
> > Setting col.names=NULL obviously removes them.
> >
> > I thought a simple solution would be to check for the file existence
> first
> > and on the first write, include the col.names. with append=T.
> > on subsequent writes, col.names would be set to NULL.
> > that didnt work and threw warnings.
> >
> > Is there anyway to do this. basically open a file for writing, with
> > append=TRUE and only write the col.names once
> > at the first write. or am I stuck and forced to write the whole file
> without
> > the col.names and then read back in and rewrite
> > with col.names="the cols names I want"
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>
>
> --
> Ista Zahn
> Graduate student
> University of Rochester
> Department of Clinical and Social Psychology
> http://yourpsyche.org
>

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