Are these functions vectorized?

Exercise Type: Prediction

Instructions

Take a look at the function definitions below. All these functions have a primary argument x which is assumed to be a single value. Assess whether they can be run with immediate vectorization, and answer these questions:

  1. Can the function be run with multiple values supplied as x?
  2. If not, why?

A 

DegToRad <- function(x) x/180*pi

B 

NumberPositive <- function(x) if(x > 0) message("x is positive!")

C 

CelsiusToFahrenheit <- x * 1.8 + 32

D 

RandomLetter <- function(x) sample(letters, x, replace=TRUE)

E 

JustSaying <- function(x) paste("I say:", x)