2D matrix operation (subtraction)

[Andre Pany]

Hi,

I have a 2D double array and I want to subtract from the first 
column a value,
is this possible with matrix operation in D?

```
void main()
{
     double[][] data = [[0.0, 1.4], [1.0, 5.2], [2.0, 0.8]];

     // subtract -2.0 from the first column for every value

     // Expected output
     // data = [[-2.0, 1.4], [-1.0, 5.2], [0.0, 0.8]];

}
```

Kind regards
André