Here we are explaining how to write an R program to rotate a given matrix 90-degree clockwise rotation. Here we are using a built-in function matrix() for this conversion. This method helps to creates a matrix from the given set of values. The syntax of this function is,

- NA: An optional data vector.
- nrow: The desired number of rows.
- ncol: The desired number of columns.
- byrow: If FALSE (the default) the matrix is filled by columns, otherwise filled by rows.
- dimnames: NULL or a list of length 2 giving the row and column names respectively.

Below are the steps used in the R program to rotate a given matrix 90-degree clockwise rotation. In this R program, we directly give the values to built-in functions. And print the function result. Here we used variables Matx for assigning matrix with values 1 to 9. Rotate the matrix by calling like t(apply(Matx, 2, rev)). Here the apply() returns a vector or array obtained by applying a function to an array or matrix. The function t() helps to get the transpose of the given matrix of the data frame.

- STEP 1: Assign variable Matx with matrix values
- STEP 2: Create a matrix of 1 to 9 elements with 3 rows
- STEP 3: Rotate it by calling like t(apply(Matx, 2, rev))
- STEP 4: Assign the result into a variable final
- STEP 5: print the result matrix final

```
Matx = matrix(1:9, 3)
print("Original matrix:")
```

`## [1] "Original matrix:"`

`print(Matx)`

```
## [,1] [,2] [,3]
## [1,] 1 4 7
## [2,] 2 5 8
## [3,] 3 6 9
```

```
final = t(apply(Matx, 2, rev))
print("Rotate the matrix 90 degree clockwise:")
```

`## [1] "Rotate the matrix 90 degree clockwise:"`

`print(final)`

```
## [,1] [,2] [,3]
## [1,] 3 2 1
## [2,] 6 5 4
## [3,] 9 8 7
```