I have a vector that I want to sort using sort but, in doing so, I do not see the missing values ( NA ). How to make? Thankful.
> x
[1] "b" "c" "a" NA NA "b" "c" "a" NA NA "b" "c" "a"
> sort(x)
[1] "a" "a" "a" "b" "b" "b" "c" "c" "c"
Just do as follows, using na.last=FALSE for missing values to appear at the beginning, na.last=TRUE to appear at the end, na.last=NA is the default value of this parameter:
> x
[1] "b" "c" "a" NA NA "b" "c" "a" NA NA "b" "c" "a"
> sort(x, na.last = FALSE)
[1] NA NA NA NA "a" "a" "a" "b" "b" "b" "c" "c" "c"
> sort(x, na.last = TRUE)
[1] "a" "a" "a" "b" "b" "b" "c" "c" "c" NA NA NA NA
> sort(x, na.last = NA)
[1] "a" "a" "a" "b" "b" "b" "c" "c" "c"
If you use the order function, the default is na.last = T .
So the following would work:
> x <- c("c", "a", NA, "b")
> x[order(x)]
[1] "a" "b" "c" NA
Just like Alexander's answer, you can put the NA's in front using:
> x[order(x, na.last = F)]
[1] NA "a" "b" "c"
I think @Alexandre's answer is better, this is just another way to do it!