# Extracting a matrix from linear expressions

Suppose I have a vector depending on symbolic parameters, say `v=vector([a-b, b-c, c-a])`

. How to extract the matrix naturally associated with the vector v ? I mean the matrix M

```
1 -1 0
0 1 -1
1 0 -1
```

since `vector([a, b, c]) * M == v`

. In fact I need the equivalent to the Maple command **GenerateMatrix**.