[R] Skip last NA's?

Petr Pikal petr.pikal at precheza.cz
Thu Mar 2 10:54:14 CET 2006

probably not the best solution but

if(tail(is.na(x), n=1)) x[1 : (length(x) -
(tail(rle(is.na(x))$lengths, n=1)))] else x 

shall do what you want.


On 2 Mar 2006 at 9:29, Robert Lundqvist wrote:

Date sent:      	Thu, 2 Mar 2006 09:29:49 +0100 (MET)
From:           	Robert Lundqvist <Robert.Lundqvist at ltu.se>
To:             	R-help at stat.math.ethz.ch
Subject:        	[R] Skip last NA's?
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> I wonder if anyone could help me find an expression for skipping the
> last missing values in a vector? The kind of material I have is
> something like
> x<-c(23,12,NA,23,24,21,NA,NA,NA)
> I would like to skip the last NA's, but not the ones in between other
> vallues. Any hints? (Why not do this by simply take x[1:6]? I have
> several vectors a couple of thousand observations long with varying
> numbers of NA's in the end. I'd prefer not to search through all of
> these one at a time.)
> Robert
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Petr Pikal
petr.pikal at precheza.cz

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