Check if a value is a whole number
is.wholenumber(x, tol = .Machine$double.eps^0.5)TRUE if x is within tol of zero, FALSE otherwise.
is.wholenumber(5)
#> [1] TRUE
is.wholenumber(5.00000000000000001)
#> [1] TRUE
is.wholenumber(.5)
#> [1] FALSE