Functions in R

1. Functions

1. Function accepts N number of inputs and provides one output
2. Functions works like a black box
3. 
   
4. Function arguments matching :  by position or by name
5. Function arguments can have defaults

vec <-c(10,30,40,50,20) sd(vec) vec <-c(10,30,40,50,20,NA) sd(vec) sd(x=vec,na.rm=TRUE) #by value sd(vec,TRUE) #by position sd()

6. What is the default value of na.rm argument? FALSE
7. How to see arguments of a function?
8. Exercise 1: create function with one mandatory argument
1. Method 1:
   
2. Method 2:

9. Exercise 2: create function with two mandatory arguments

10. Exercise 3: create function with one mandatory arguments and one optional argument