Hi, I know how to access the element at a specific position of a matrix. For example,

```
m = [1 2 3; 4 5 6] # m is a 2 by 3 matrix
m[1,2] # m[1,2] would return the element at position (1,2), which is number 2
m[(1,2)] # m[(1,2)] would not work
```

I’m reading some code, and get into the following confusing point.

```
indices = [ ( m.v[i], m.v[j] ) for (i,j) in m.e ]
m.w[ indices[i] ]
```

indices is a vector of tuples, and m.w is a matrix. This would not work, right? based on the similar reasons as the above, or did I miss something?