Cannot use array in the formula?

Cannot use array in the formula?

[龙 飞]

I try to use:
\startformula
\left\{ \begin{array}{r@=l}
xx & yy \\
zz & aa
\end{array} \right.
\stopformula
But Context log says 
"Undefined control sequence \begin{array}."
How can I input multi-line equation in ConTeXt? Thanks

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Re: Cannot use array in the formula?

[Sytse Knypstra]

You can use \TeX commands such as \matrix, \pmatrix, \cases, \eqalign.

Sytse Knypstra

龙 飞 wrote:
> I try to use:
> \startformula
> \left\{ \begin{array}{r@=l}
> xx & yy \\
> zz & aa
> \end{array} \right.
> \stopformula
> But Context log says "Undefined control sequence \begin{array}."
> How can I input multi-line equation in ConTeXt? Thanks
> 
> _________________________________________________________________
> 与联机的朋友进行交流，请使用 MSN Messenger: http://messenger.msn.com/cn
> _______________________________________________
> ntg-context mailing list
> ntg-context@ntg.nl
> http://www.ntg.nl/mailman/listinfo/ntg-context

Re: Cannot use array in the formula?

[Mojca Miklavec]

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On 5/24/05, 龙 飞 <longf77@hotmail.com> wrote:
> I try to use:
> \startformula
> \left\{ \begin{array}{r@=l}
> xx & yy \\
> zz & aa
> \end{array} \right.
> \stopformula
> But Context log says
> "Undefined control sequence \begin{array}."

\begin{array} comes from LaTeX.

> How can I input multi-line equation in ConTeXt? Thanks

You can use \matrix from plain TeX:

\startformula
\left\{\matrix{
	xx & yy \cr
	zz & aa}
\right.
\stopformula

I'm not sure if there's any mechanism for automatic (right/left)
alignment. I use \hfill if necessary. (xx\hfill yy\hfill \cr ...)

Mojca

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