[R] How to get R to ignore certain values when analyzing a column in a data table ?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Jul 10 08:35:15 CEST 2006
On Sun, 9 Jul 2006, Daryl Manning wrote:
> Apologies if this is in (one of the many) manuals somewhere... Trying
> to switch to R from other stats programs.
> Basically, I have a large data table I've dumped from a DB, some of
> the values which are nulls '-' which I've converted to zeros. I've
> read it in using read.table fine.
> I want R to ignore the zero values when graphing or doing various
> other calculations.
> Is there a way to do this ?
> I did try to use NA but kept getting errors that x must be numeric.
Did you use numeric NA? That is the way to so this, so you will need to
give a reproducible example (as the posting guide asks).
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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