Page 34 - Applied Statistics with R

34 CHAPTER 3. DATA AND PROGRAMMING

x = 1:9
y = 9:1
X = matrix(x, 3, 3)
Y = matrix(y, 3, 3)
X

## [,1] [,2] [,3]
## [1,] 1 4 7
## [2,] 2 5 8
## [3,] 3 6 9

Y

## [,1] [,2] [,3]
## [1,] 9 6 3
## [2,] 8 5 2
## [3,] 7 4 1

X + Y

## [,1] [,2] [,3]
## [1,] 10 10 10
## [2,] 10 10 10
## [3,] 10 10 10

X - Y

## [,1] [,2] [,3]
## [1,] -8 -2 4
## [2,] -6 0 6
## [3,] -4 2 8

X * Y

## [,1] [,2] [,3]
## [1,] 9 24 21
## [2,] 16 25 16
## [3,] 21 24 9

X / Y