[NTG-context] Augmented matrix?

[Alasdair McAndrew]

How can I typeset an augmented matrix, that is, a matrix where some columns
are separated by a vertical line?  "\VL" doesn't seem to work within a
formula.

Thanks very much!

cheers,
Alasdair

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[NTG-context] Augmented Matrix

[Paul Dostert]

I'm trying to make a simple Augmented matrix using \startmathmatrix
and cannot seem to get \VL working correctly. I'd assume to do an
augmented matrix I'd do:

\startformula
\left[
\startmathmatrix[n=4]
1 \NC 1 \NC 1 \VL 1\NR
0 \NC 1 \NC -1 \VL 2\NR
0 \NC 0 \NC 2 \VL 8
\stopmathmatrix
\right]
\stopformula

but I get an undefined control sequence. If it were LaTex, I'd do:

$$
\left[
\begin{array}{ccc|c}
1 & 1 & 1 & 1\\
0 & 1 & -1 & 2\\
0 & 0 & 2 & 8
\end{array}
\right]
$$

Any suggestions?

Thanks
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