Functions overview

---

function_name = function(arg1, arg2, arg3) {
     # commands
     return(someReturnValue)
}

• Function parameter names are local to the function
• variables created in the function are local
• Result of last expression returned implicitely (even without calling return())

• When accepting a vector of numbers what if the user sends in a vector of strings (different class of data)?
• What if some of the values are missing? (NA)
• What if the vector is empty?