Finding the index of an NA value in a vector
na, r, vector
Solution
You may want to try using the `which` and `is.na` functions in the the following manner:
which(is.na(x))
[1] 3
Problem
I have the following vector: ``` x <- c(3, 7, NA, 4, 8) ``` And I just want to know the index of the `NA` in the vector. If, for instance, I wanted to know the index of `7`, the following code would work: ``` > which(x == 7) [1] 2 ``` I find it odd that running the same code when trying to find the index of the `NA` does not give me the desired result. ``` > which(x == NA) integer(0) ``` I also tried the following but it does not work: ``` > which(x == "NA") integer(0) ``` Your help will be much appreciated. Edit The question has been answered below by @ccapizzano, but can anyone explain why the codes above do not work?