# R Programming: Create a 5 × 4 matrix, 3 × 3 matrix with labels and fill the matrix by rows and 2 × 2 matrix with labels and fill the matrix by columns

## R Programming: Basic Exercise-16 with Solution

Write a R program to create a 5 × 4 matrix , 3 × 3 matrix with labels and fill the matrix by rows and 2 × 2 matrix with labels and fill the matrix by columns.

**Sample Solution** :

**R Programming Code :**

```
m1 = matrix(1:20, nrow=5, ncol=4)
print("5 × 4 matrix:")
print(m1)
cells = c(1,3,5,7,8,9,11,12,14)
rnames = c("Row1", "Row2", "Row3")
cnames = c("Col1", "Col2", "Col3")
m2 = matrix(cells, nrow=3, ncol=3, byrow=TRUE, dimnames=list(rnames, cnames))
print("3 × 3 matrix with labels, filled by rows: ")
print(m2)
print("3 × 3 matrix with labels, filled by columns: ")
m3 = matrix(cells, nrow=3, ncol=3, byrow=FALSE, dimnames=list(rnames, cnames))
print(m3)
```

Sample Output:

[1] "5 × 4 matrix:" [,1] [,2] [,3] [,4] [1,] 1 6 11 16 [2,] 2 7 12 17 [3,] 3 8 13 18 [4,] 4 9 14 19 [5,] 5 10 15 20 [1] "3 × 3 matrix with labels, filled by rows: " Col1 Col2 Col3 Row1 1 3 5 Row2 7 8 9 Row3 11 12 14 [1] "3 × 3 matrix with labels, filled by columns: " Col1 Col2 Col3 Row1 1 7 11 Row2 3 8 12 Row3 5 9 14

**R Programming Code Editor:**

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**Previous:** Write a R program to create three vectors numeric data, character data and logical data. Display the content of the vectors and their type.

**Next:** Write a R program to create an array, passing in a vector of values and a vector of dimensions, also provide names for each dimension.

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