I'm trying to typeset a small column of numbers with a right brace on the
right, and nothing on the left.  (Sort of like the opposite to the right
hand side of a cases environment).  I've tried:

\definemathmatrix[group][left={},right={\,\right\} }]

\startgroup
    10\NR 9\NR 8\NR
\stopgroup

But this just gives me errors: and the right brace in my group definition is
just ignored.  So, how can I get a brace which extends to the full height of
the column?  If I use

\definemathmatrix[group][left={},right={\,\rbrace}]

This just gives me a small brace, and doesn't extend it vertically.

Thanks very much!

-Alasdair

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