# How to convert a vector into matrix in R?

To convert a vector into matrix, just need to use matrix function. We can also define the number of rows and columns, if required but if the number of values in the vector are not a multiple of the number of rows or columns then R will throw an error as it is not possible to create a matrix for that vector.

Here, we will read vectors by their names to make it easy but you can change their names if you want. There are four vectors of different lengths that are shown in these examples −

## Example

s
> Vector1<-1:9
> Vector1
 1 2 3 4 5 6 7 8 9
> Vector1<-as.matrix(Vector1)
> Vector1
[,1]
[1,] 1
[2,] 2
[3,] 3
[4,] 4
[5,] 5
[6,] 6
[7,] 7
[8,] 8
[9,] 9
> Vector1<-matrix(Vector1,nrow=3)
> Vector1
[,1] [,2] [,3]
[1,] 1   4    7
[2,] 2   5    8
[3,] 3   6    9
> Vector2<-c(24,26,14,15,39,18,17,25,17,19,18,23,24,19,27,15)
> Vector2
 24 26 14 15 39 18 17 25 17 19 18 23 24 19 27 15
> Vector2<-as.matrix(Vector2)
> Vector2
[,1]
[1,] 24
[2,] 26
[3,] 14
[4,] 15
[5,] 39
[6,] 18
[7,] 17
[8,] 25
[9,] 17
[10,] 19
[11,] 18
[12,] 23
[13,] 24
[14,] 19
[15,] 27
[16,] 15
> Vector2<-matrix(Vector2,nrow=4,byrow=TRUE)
> Vector2
[,1] [,2] [,3] [,4]
[1,] 24   26   14   15
[2,] 39   18   17   25
[3,] 17   19   18   23
[4,] 24   19   27   15
> Vector3<-sample(1:100,25)
> Vector3
 86 84 32 14 4 78 7 82 71 38 98 87 58 54 46 44 88 65 97 60 31 89 63 91 90
> Vector3<-matrix(Vector3,nrow=5)
> Vector3
[,1] [,2] [,3] [,4] [,5]
[1,] 86   78   98   44   31
[2,] 84    7   87   88   89
[3,] 32   82   58   65   63
[4,] 14   71   54   97   91
[5,]  4   38   46   60   90
> Vector3<-matrix(Vector3,nrow=2)
Warning message:
In matrix(Vector3, nrow = 2) :
data length  is not a sub-multiple or multiple of the number of rows 
> Vector4<-1:10
> Vector4
 1 2 3 4 5 6 7 8 9 10
> Vector4<-matrix(Vector4,nrow=2)
> Vector4
[,1] [,2] [,3] [,4] [,5]
[1,] 1 3 5 7 9
[2,] 2 4 6 8 10
> Vector4<-matrix(Vector4,ncol=2)
> Vector4
[,1] [,2]
[1,] 1    6
[2,] 2    7
[3,] 3    8
[4,] 4    9
[5,] 5   10