[R] Removing elements from a vector matching a criteria, BUG in which() function

[Rumen Kostadinov]

Dear all,

I found a bug in the which() function.

When trying to remove elements with the which function,
if the criteria is not matched, numeric(0) is returned instead of the
array itself.

This is very weird.

> a = c(1,2,3,4,5)
> a[!a==6]
[1] 1 2 3 4 5
> a[-which(a==6)]
numeric(0)
> a[-which(a==5)]
[1] 1 2 3 4
> a[!a==5]
[1] 1 2 3 4

Is this correct? I believe this is a bug.

I have to rewrite a lot of my R code to use
a = a[!criteria]
and not
a = a[-which(criteria)]

R.