function
.
as.function(x) is.function(x)
as.function
merely changes the mode of
x
to
"function"
.
is.function
tests whether
x
is a function.
Both of these functions are generic; currently there are no methods written for either of them.
polynom <- function(x) { x^2 + 3 * x - 6 } is.function(polynom) # returns TRUE