[R] count appearence of zero in a vector

[Suzen, Mehmet]

Hi Hermann,

You may want to use ?which, to store the index as well (might be handy
in debugging or some other
purposes if zeros has some special meaning) :

test <- c(1, 1, 1 , 1 , 1, 1, 2, 1, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1,
1, 1, 0, 1, 2, 1, 1, 1, 1, 1, 1)
length(which(test==0))

But be careful when using == 0. If you are sure that elements are all
integers I prefer this

length(which(test <1)).

Or a safe tolerance value from .Machine, if you are dealing with double numbers.

length(which(test < .Machine$double.xmin))


-m