Chapter 6 Convert vector to a Matrix

dim(num1) <- c(4, 5)

attributes(num1)

## $dim
## [1] 4 5

num1

##      [,1] [,2] [,3] [,4] [,5]
## [1,]    1    5    9   13   17
## [2,]    2    6   10   14   18
## [3,]    3    7   11   15   19
## [4,]    4    8   12   16   20

class(num1)

## [1] "matrix" "array"

my_matrix <- num1