On Fri, Aug 5, 2022 at 2:01 AM Jethro Djan via ntg-context
<ntg-context@ntg.nl> wrote:
>
> Hello,
>
> I want to get underbraces under matrices in a math alignment environment.
> I’ve reproduced my problem here:
>
> \definemathmatrix
> [pmatrix]
> [left={\left(\,},right={\,\right)}]
>
> \starttext
> \placeformula[-]\startformula\startmathalignment
> \NC\
> A \NC=\underbrace{
> \startpmatrix
> \NC 5\NC 5\NR
> \NC -1\NC 7\NR
> \stoppmatrix}\NR
> \NC\NC=\underbrace{
> \startpmatrix
> \NC 2\NC 1\NR
> \NC 4\NC 2\NR
> \stoppmatrix}\NR
> \stopmathalignment\stopformula
> \stoptext
>
> How can I achieve this?
>
> Jethro
Hi Jethro,
Temporary workaround: use the simplecommand.
\definemathmatrix[pmatrix][matrix:parentheses][
simplecommand=pmatrix,
]
\starttext
% \placeformula[-]
\startformula
\startalign
\NC A \NC = \underbrace{\pmatrix{5,5;-1,7}}_{B} \NR
\NC\NC = \underbrace{\pmatrix{2,1;4,2}}_{C} \NR
\stopalign
\stopformula
% \placeformula[-]
\startformula
A \alignhere=
\underbrace{\pmatrix{5,5;-1,7}}_{B}
\breakhere
=
\underbrace{\pmatrix{2,1;4,2}}_{C}
\stopformula
\stoptext
But the code you were using should in principle also work.
/Mikael
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