[R] Compare rows of two matrices
R user
R-user at zutt.org
Mon Feb 21 16:14:10 CET 2005
> y <- matrix( c(20, NA, NA, 45, 50, 19, 32, 101, 10, 22, NA, NA, 80, 49, 61, 190), ncol=4 )
> x <- matrix( c(20, NA, NA, NA, 50, 19, 32, 101, 10, 22, NA, NA, 80, 49, 61, 190), ncol=4 )
>
> #Whereas x contains all NA´s from y plus some additional NA´s.
> #I want to find the index of these additional NA´s. I think, there must be a very easy way to do this.
How about this:
is.na(x) & !is.na(y)
Jonne.
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