I have a simple matrix like:

```
> a = matrix(c(c(1:10),c(10:1)), ncol=2)
> a
[,1] [,2]
[1,] 1 10
[2,] 2 9
[3,] 3 8
[4,] 4 7
[5,] 5 6
[6,] 6 5
[7,] 7 4
[8,] 8 3
[9,] 9 2
[10,] 10 1
```

I would like to get this result:

```
[,1] [,2]
[1,] 10 1
[2,] 9 2
[3,] 8 3
[4,] 7 4
[5,] 6 5
[6,] 5 6
[7,] 4 7
[8,] 3 8
[9,] 2 9
[10,] 1 10
```

The exact reverse of the matrix. How can I get it?

Thanks

## Best Solution