It seems that \NC in mathalignment is looking ahead for the next \NR, because
when I wrap the matrix
in an explicit brace group it works fine again:
\definemathmatrix
[pmatrix]
[left=\left(,right=\right)]
\starttext
\placeformula
\startformula
\startmathalignment
\NC \sigma_x \NC=
{\startpmatrix
\NC 0 \NC 1 \NR
\NC 1 \NC 0 \NR
\stoppmatrix}
\NR[+]
\stopmathalignment
\stopformula
\stoptext
On Tue, 2017-06-06 at 10:26 +1200, Henri Menke wrote:
> Dear list,
>
> When I have a mathmatrix inside a mathalignment the numbering using \NR[+]
> does not work anymore.
> Instead it prints "[+]" on the next line. I guess the definition of \NR
> from mathmatrix leaks
> outside. Affects both TL2017 and latest beta. MWE is below.
>
> Cheers, Henri
>
> ---
>
> \definemathmatrix
> [pmatrix]
> [left=\left(,right=\right)]
>
> \starttext
>
> \startformula
> \startmathalignment
> \NC \sigma_x \NC=
> \startpmatrix
> \NC 0 \NC 1 \NR
> \NC 1 \NC 0 \NR
> \stoppmatrix
> \NR[+]
> \NC \sigma_y \NC=
> \startpmatrix
> \NC 0 \NC -i \NR
> \NC i \NC 0 \NR
> \stoppmatrix
> \NR[+]
> \NC \sigma_z \NC=
> \startpmatrix
> \NC 1 \NC 0 \NR
> \NC 0 \NC -1 \NR
> \stoppmatrix
> \NR[+]
> \stopmathalignment
> \stopformula
>
> \stoptext
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