AMSTeX: Vertical Line in Matrix

[BvU]

Anyone know how to get a vertical line between two columns ? Like here in AMSTeX

 

[BvU]

Never mind, found an alternative:

\left[
\begin{array}{cccc|c}
1 & 0 & 3 & -1 & 0 \\
0 & 1 & 1 & -1 & 0 \\
0 & 0 & 0 & 0 & 0 \\
\end{array}
\right]

$$
\left[
\begin{array}{cccc|c}
1 & 0 & 3 & -1 & 0 \\
0 & 1 & 1 & -1 & 0 \\
0 & 0 & 0 & 0 & 0 \\
\end{array}
\right]
$$