The distributions will vary according to the base ring over which
you are considering matrices.

To access the documentation, open a Sage session and run

```
sage: random_matrix?
```

then hit the ENTER or RETURN key. This will display the documentation (in text mode).

Alternatively, run

```
sage: browse_sage_doc(random_matrix)
```

to display the documentation rendered in HTML.

The corresponding page in the reference manual is accessible from this page:

http://doc.sagemath.org/html/en/reference/matrices/sage/matrix/special.html.

You may also want to access the documentation for the `random_element`

method of the base ring.

For example, type one of

```
sage: R = ZZ
sage: R = QQ
sage: R = GF(5)
sage: R = Zmod(12)
```

followed by one of

```
sage: R.random_element?
sage: browse_sage_doc(R.random_element)
```