Accessing elements in a matrix

You can access the elements in a matrix in a similar way to how you accessed elements of a vector using indexing. However, the elements here would be the index number of rows and columns. 

Here a some examples of accessing elements:

• If you want to access the element at a second column and first row:

m<-array(c(1,2,3,4,5,6), dim=c(2,3))
m
## [,1] [,2] [,3]
## [1,] 1 3 5
## [2,] 2 4 6
m[1,2]
## [1] 3

• Similarly, accessing the element at the second column and second row:

m[2,2]
## [1] 4

• Accessing the elements in only the second row:

m[2,]
## [1] 2 4 6

• Accessing only the first column:

m[,1]
## [1] 1 2