Vectorized Operations

Question 1

Why are vectorized operations useful?

Answer 1

prevent you from having to write for loops and allow you to operate on elements of a vector in parallel

Question 2

x <- 1:5. What does the expression x > 2 return?

Answer 2

a logical vector with the values:
FALSE FALSE TRUE TRUE TRUE

Question 3

How do you multiple the elements of two vectors x and y?

Answer 3

x * y

Question 4

Given two vectors, x <- c(1, 2, 3) and y <- c(4, 5, 6), what results from the expression x / y?

Answer 4

[1] 0.25 0.40 0.50