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

[Steve Murray]

Dear all,

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