why does 5 == 3|7 is TRUE in R-CodePudding

3 == 7|5

I know R uses "==" in precedence of "||, but what does the code above actually mean and why it gives a TRUE in return

CodePudding user response：

Any value other than 0 is considered as TRUE

FALSE|5
[1] TRUE

If we do all the precautionary measures i.e. check for precedence by wrapping within ()

> (3 == 7)|5
[1] TRUE

because 3 == 7 returns FALSE and by default TRUE/FALSE values coerce to 1/0. Also, check the as.logical coersion

> as.logical(c(5, 0))
[1]  TRUE FALSE

CodePudding user response：

Explanation:

| is a logical or. Which gives TRUE if the boolean representative is TRUE from both expressions, with the order of operations in R, your code get's processed as:

(3 == 7) | 5

Whereas 3 == 7 gives FALSE, but the boolean representative of 5 is TRUE, so FALSE | TRUE gives TRUE.

Graph:

Here is a graph (tree) of the way this code gets processed:

(3 == 7) |    5
   ↙          ↘
 FALSE   |   TRUE
        ↓↓↓
        TRUE