[SOLVED] R: Keep function vectorized using all()

R: Keep function vectorized using all()

I have a function fun checking multiple conditions a, b. If all conditions are fulfilled, the function should return TRUE, else it should return FALSE.

a = 1
b = 0

fun <- function(a, b){
  all(a < 1,
      b < 1,
      na.rm = TRUE)
}

fun(a, b)

This function does the trick. However, if I use vectors now, all() does of course not keep the vector form but rather returns a single TRUE or FALSE.

I would like to have a function that works the same as the following one:

a = 1:2
b = 0:1

funV <- function(a, b){
  a < 1 & b < 1
}

funV(a, b)

but without chaining & and it should also work with missing values.

Solution

We can use Vectorize() for this to create a vectorized function. Vectorize() uses mapply() under the hood.

fun <- function(a,b){
  all(a < 1,
      b < 1,
      na.rm = TRUE)
}

a = 1:2
b = 0:1

funV <- Vectorize(fun)

funV(a,b)
#> [1] FALSE FALSE

^{Created on 2023-02-14 by the reprex package (v2.0.1)}