On Mon, 27 Feb 2023, Bruce Horrocks via ntg-context wrote:

> 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?

You can right align all columns, though I am not sure that this looks better, 
because column 2 and 3 now appear to be "too close".

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

Aditya
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