See if this way suits you. \definemathmatrix[bmatrix] [matrix:brackets] [simplecommand=bmatrix] \starttext $ a \rightarrow \bmatrix{1, \hfill 2, 3, \hfill 4; 2, \hfill 1, 4, \hfill 3; 3,-4, 1,-2; 4,-3, 2,-1} $ \stoptext Bruce Horrocks via ntg-context 於 2023年2月27日 週一 上午8:56寫道：

I'm using the following MWE to produce a matrix:

\definemathmatrix[bmatrix] [matrix:brackets] [simplecommand=bmatrix] \starttext $ a \rightarrow \bmatrix{1, 2, 3, 4; 2, 1, 4, 3; 3,-4, 1,-2; 4,-3, 2,-1} $ \stoptext

The columns with negative numbers in are centred and I would rather have them right-aligned so that the digits stack up above each other and the negative signs stick out to the left, so to speak. Is there an easy way to achieve this?

— Bruce Horrocks Hampshire, UK

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