[R] read data into R with some constraints

[Prof Brian D Ripley]

On Thu, 11 Jan 2001, Jonathan Baron wrote:

> >I have a big data file (over 30,000 records) looks
> >like this:
> >
> >100, 20, 46, 70
> >103,  0, 22, 45
> >117, -1, 34, 65
> >120, 15,  0, 25
> >113,  0,  -1, 32
> >142, -1, -1, 55
> >.....
> >
> >I want to read only those records having positive
> >values in all of the  four
> >columns. That is, I don't want to read record # 3, 5,
> >and 6 into R.
>
> Perhaps someone knows how to do this with R, but, if
> I had to do it right now, I would pre-process with grep
> before reading into R:
>
> grep -v "-" myddata > myshorterdata
>
> The "grep" tool is available on Unix and Linux.  If you have
> Windows, it would be useful to get the "unix tools for windows",
> which, unfornuately, I have just been unable to find after 10
> minutes of searching www.gnu.org.

http://www.stats.ox.ac.uk/pub/Rtools

would be a good start.


-- 
Brian D. Ripley,                  ripley at 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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