[R] How to get R to ignore certain values when analyzing a column in a data table ?

From: Daryl Manning <dwm_at_wakatara.com>
Date: Mon 10 Jul 2006 - 13:01:10 EST


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.

thanks in advance,
Daryl.



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