[Axiom-developer] [AxiomProblems] List to matrix?

[anonymous]

Changes http://page.axiom-developer.org/zope/mathaction/AxiomProblems/diff
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Now my second question (extending the second one). Assume that I have a 'List', 
like the one before:
\begin{axiom}
[[- 1,3,- 3,1],[3,- 6,3],[- 3,3],[1]]
\end{axiom}
(which is calculated from some earlier expressions). How can I convert it into 
a 'SquareMatrix'. Namely I want to have a matrix like:
\begin{axiom}
A := matrix[[- 1,3,- 3,1],[3,- 6,3,0],[- 3,3,0,0],[1,0,0,0]]
\end{axiom}
so that I can do
\begin{axiom}
vp := vector[p0,p1,p2,p3]
\end{axiom}
and
\begin{axiom}
vp * A
\end{axiom}
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forwarded from http://page.axiom-developer.org/zope/mathaction/address@hidden