Hi all,

I have a matrix as shown below. Is there a way to add additional column that is calculated through a for loop only. For example

```
MatrixA
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 a 8
[3,] 3 6 9
```

Expected. Adding 4 th column to a matrix that is the result of first and second column.

```
MatrixA
[,1] [,2] [,3] [,4]
[1,] 1 4 7 5 is the result
[2,] 2 a 8 Error in 2 + "a" : non-numeric argument to binary operator is the result
[3,] 3 6 9 9 is the result
```

Above summation should be done using **for loop**. For example, something like below

```
for (i in 1:nrow(MatrixA)) {
as[[i]] <- paste0(MatrixA[i,1] +MatrixA[i,2], "is the result")
}
```