Edit detail for List To Matrix revision 1 of 1

changed:
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Assume that I have a 'List', like:
\begin{axiom}
L := [[- 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'.
\begin{axiom}
L2:=[concat([L.i.j for j in 1..#L.i],[0 for j in ((#L.i)+1)..#L]) for i in 1..#L]
\end{axiom}

Namely I want to have a matrix like:
\begin{axiom}
A := matrix L2
\end{axiom}
so that I can do
\begin{axiom}
vp := vector[p0,p1,p2,p3]
\end{axiom}
and
\begin{axiom}
vp * A
\end{axiom}

Assume that I have a List, like:

fricas

(1) -> L := [[- 1,3,- 3,1],[3,- 6,3],[- 3,3],[1]]

(1)

Type: List(List(Integer))

(which is calculated from some earlier expressions). How can I convert it into a SquareMatrix.

fricas

L2:=[concat([L.i.j for j in 1..#L.i],[0 for j in ((#L.i)+1)..#L]) for i in 1..#L]

(2)

Type: List(List(Integer))

Namely I want to have a matrix like:

fricas

A := matrix L2

(3)

Type: Matrix(Integer)

so that I can do

fricas

vp := vector[p0,p1,p2,p3]

(4)

Type: Vector(OrderedVariableList([p0,p1,p2,p3]))

and

fricas

vp * A

(5)

Type: Vector(Polynomial(Integer))