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

[Petr PIKAL]

Hi

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.

See
?na.omit
na.action or na.rm parameters in many modelling or summary functions.

Regards
Petr



> tried using is.na and the testdata[testdata$onecolumn==NA] <- 9999 
approach, 
> but whilst neither generate errors, neither result in -9999s appearing - 
the 
> 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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