On Thu, 9 Oct 2014, Hans Hagen wrote:

On 10/7/2014 8:06 PM, Thangalin wrote:
Looks like a bug; adding blank rows works around the problem (but
looks terrible):

\definemathmatrix[pmatrix] [left={\left(\,},right={\,\right)}]

\starttext
Digueu quines de les matrius següents són regulars. Quan ho siguin,
trobeu la inversa

\startitemize[a,columns,four]
\item \startpmatrix[n=4]
\NC \NR
\NC 2 \NC 3 \NR
\NC 6 \NC 7 \NR
\NC \NR
\stoppmatrix

\item \startpmatrix[n=4]
\NC 3 \NC 2 \NC 1 \NR
\NC 4 \NC 5 \NC 3 \NR
\NC 5 \NC 0 \NC -2 \NR
\NC
\stoppmatrix

\item \startpmatrix[n=4]
\NC 5 \NC 4 \NC 2 \NR
\NC 2 \NC 2 \NC 3 \NR
\NC 7 \NC 6 \NC 5 \NR
\NC
\stoppmatrix

\item \startpmatrix[n=4]
\NC a \NC 0 \NC 0 \NC 0 \NR
\NC 0 \NC b \NC 0 \NC 0 \NR
\NC 0 \NC 0 \NC c \NC 0 \NR
\NC 0 \NC 0 \NC 0 \NC d \NR
\stoppmatrix

\stopitemize

\stoptext

not a bug ...

(1) the matrix is centered around the math axis and has equal height and depth so indeed in columns that will not align horizontally

IIRC, we had added a `location=(high|middle|low)` key to change that behaviour. (Sorry, cannot test right now).

Aditya
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