R: a False or NA that returns False

Question

In the R language, I need an operator that returns a | b, except if either a or b is NA and the other one is F.

Currently, F | NA returns NA, I would like it to return F.

This function should work with vectors.

Any idea?

Answer 1

Got it!

myor = function(a,b){
  !((is.na(a) & !b) | (is.na(b) & !a) | (!a & !b))
}   

> myor(T,T)
[1] TRUE
> myor(T,F)
[1] TRUE
> myor(F,F)
[1] FALSE
> myor(F,NA)
[1] FALSE
> myor(NA,NA)
[1] NA
> myor(T,NA)
[1] TRUE