Logical operators - short (relational) and long (vector) forms

Question

I am a little confused about using short and long forms of logical operators in R.

If I have the following values

A <- FALSE B <- TRUE X <- 3 Y <- 2 

I would like to evaluate NOT (A) OR NOT (B) AND X <Y

I expect FALSE given the parameters

This is the expression I found to evaluate this in R , so it returns FALSE as I expect:

 !A & X < Y || !B & X < Y 

Is it possible to eliminate the repeated comparison X < Y ?

Answer 1

Do you mean:

 > (!A || !B) && X < Y [1] FALSE 

?

Answer 2

short form gives you a vector.
long form gives you one meaning. compare:

  x <- c(TRUE, TRUE, FALSE) y <- c(TRUE, FALSE, FALSE) X && Y X & y x || y x | y 

Answer 3

Another possibility:

 !(A * B) && X < Y