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

Daryl Manning dwm at wakatara.com
Mon Jul 10 05:01:10 CEST 2006

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,

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