does this vector only contains 1 and 2

Source: R/is_misc.R

does this vector only contains 1 and 2

is.12(x)

Arguments

x

a vector

Value

a boolean

Examples


is.12(c(1,1,2,1,2))
#> [1] TRUE
is.12(c(1,1,2,1,5))
#> [1] FALSE