[R] Odp: Replacing NA values in one column of a data.frame

Petr PIKAL petr.pikal at precheza.cz
Tue Aug 18 14:43:03 CEST 2009


r-help-bounces at r-project.org napsal dne 17.08.2009 17:41:59:

> Dear all,
> I'm trying to replace NA values with -9999 in one column of a data 
frame. I've

Well, Jim sent you a solution but I would rise a question, why do you want 
to do that. R has many instruments how to smoothly handle NA (missing 
values) but not many how to handle -9999 values.

na.action or na.rm parameters in many modelling or summary functions.


> tried using is.na and the testdata[testdata$onecolumn==NA] <- 9999 
> but whilst neither generate errors, neither result in -9999s appearing - 
> NAs remain there!
> I'd be grateful for any advice on what I'm doing wrong or any other 
suitable approaches.
> Many thanks,
> Steve
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