What is the difference between (d) and (e)? How to display the results in consol

Question

What is the difference between (d) and (e)? How to display the results in console in R? 1. (13 Points-3 for comments) Write an R program that performs the following tasks: 15 27 9 and b-14 9 (a) (2 Points for code) Construct the vectors a = 2 (b) (2 Points-1 for code) Find the sum of a and b. (c) (2 Pots-1 for code) Find the difference a - b. (d) (2 Points 1 for code) Find the dot product of a and b. (e) (2 Points 1 for code)Find the element-wise product of a and b. In your code, include comments (3 Points), and make sure that your code includes statements for each of parts a)-e) that tell R to display the results in the console.

Explanation / Answer

a)

a <- c(9,3,2,7,11)
> b <- c(15,27,14,9,8)

b)

> a+b
[1] 24 30 16 16 19

c)

> a-b
[1] -6 -24 -12 -2   3

d)

> a %*% b
     [,1]
[1,] 395

e)

> a *b
[1] 135 81 28 63 88

note d ) is dot-product which is actually sum of element-wise product of each row . it is scalar quantity

where as element-wise product is vector with product of two corresponding row.

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