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How to convert a text vector into a matrix in R?
Sometimes numerical values are being read as strings and hence creating a matrix using that vector is not straight forward.
For the conversion of text vector into a matrix, we need to use scan function and specify the appropriate number of rows or columns as shown in the below given examples.
Example 1
Consider the below given vector x1 −
x1<-"14 25 26 1 4 5 5 4 5 111 255 236 225 225 221 74 5 8 74 85 65 24 12 36 41"
Now, to convert x1 into a matrix, use the code given below −
x1<-"14 25 26 1 4 5 5 4 5 111 255 236 225 225 221 74 5 8 74 85 65 24 12 36 41" x1_matrix<-matrix(scan(text=x1),nrow=5,byrow=TRUE) x1_matrix
Output
If you execute all the above given codes as a single program, it generates the following output −
[,1][,2][,3][,4][,5] [1,] 14 25 26 1 4 [2,] 5 5 4 5 111 [3,] 255 236 225 225 221 [4,] 74 5 8 74 85 [5,] 65 24 12 36 41 Read 25 items
Example 2
Consider the below given vector x2 −
x2<-"54 5 4 3 6 7 8 6 5 4 3 2 1 3 4 5 6 7 8 9 0 9 9 3 4 5 6 6 7 7 3 2 1 2 3 4 55 6 7 8"
Now, to convert x2 into a matrix, use the following code −
x2<-"54 5 4 3 6 7 8 6 5 4 3 2 1 3 4 5 6 7 8 9 0 9 9 3 4 5 6 6 7 7 3 2 1 2 3 4 55 6 7 8" x2_matrix<-matrix(scan(text=x2),nrow=20,byrow=TRUE) x2_matrix
Output
If you execute all the above given codes as a single program, it generates the following output −
[,1][,2] [1,] 54 5 [2,] 4 3 [3,] 6 7 [4,] 8 6 [5,] 5 4 [6,] 3 2 [7,] 1 3 [8,] 4 5 [9,] 6 7 [10,] 8 9 [11,] 0 9 [12,] 9 3 [13,] 4 5 [14,] 6 6 [15,] 7 7 [16,] 3 2 [17,] 1 2 [18,] 3 4 [19,] 55 6 [20,] 7 8 Read 40 items
Example 3
Consider the below given vector x3 −
x3<-"8 9 8 7 9 4 3 2 2 3 4 5 5 5 6 7 7 8 8 9 9 3 3 2 2 3 1 5 6 9 7 4 2 3 5 8 6 9 5 4 1 2 3 2 5 6 4 7 5 6 8 5 2 1 2 3 5 4 7 5"
Now, to convert x3 into a matrix, use the following code −
x3<-"8 9 8 7 9 4 3 2 2 3 4 5 5 5 6 7 7 8 8 9 9 3 3 2 2 3 1 5 6 9 7 4 2 3 5 8 6 9 5 4 1 2 3 2 5 6 4 7 5 6 8 5 2 1 2 3 5 4 7 5" x3_matrix<-matrix(scan(text=x3),nrow=20,byrow=TRUE) x3_matrix
Output
If you execute all the above given codes as a single program, it generates the following output −
[,1][,2][,3] [1,] 8 9 8 [2,] 7 9 4 [3,] 3 2 2 [4,] 3 4 5 [5,] 5 5 6 [6,] 7 7 8 [7,] 8 9 9 [8,] 3 3 2 [9,] 2 3 1 [10,] 5 6 9 [11,] 7 4 2 [12,] 3 5 8 [13,] 6 9 5 [14,] 4 1 2 [15,] 3 2 5 [16,] 6 4 7 [17,] 5 6 8 [18,] 5 2 1 [19,] 2 3 5 [20,] 4 7 5 Read 60 items
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