1 | initial version |

To construct a matrix of matrices:

```
sage: a = random_matrix(QQ, 2, 2)
sage: b = random_matrix(QQ, 2, 2)
sage: c = random_matrix(QQ, 2, 2)
sage: d = random_matrix(QQ, 2, 2)
sage: v = matrix([[a,b,c,d]])
```

It prints horribly (but `view(v)`

looks good).

```
sage: a
[ 2 0]
[ 1 1/2]
sage: b
[ 0 -1]
[1/2 2]
sage: c
[ 2 1]
[ 2 -2]
sage: d
[ -1 1/2]
[1/2 1]
sage: v
[[ 2 0]
[ 1 1/2] [ 0 -1]
[1/2 2] [ 2 1]
[ 2 -2] [ -1 1/2]
[1/2 1]]
sage: v.nrows()
1
sage: v.ncols()
4
sage: v.base_ring()
Full MatrixSpace of 2 by 2 dense matrices over Rational Field
```

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