Re: feature request

[Henri Menke <henrimenke@gmail.com>]

On 3/07/19 6:00 PM, Atsuhito Kohda wrote:
> I've used LaTeX quite a long time but recently I begin to use ConTeXt too.
> So I'm very sorry if the following is well-known issue.
> 
> I find an example of \pmatrix in p.21 of "ConTeXt Mark IV an excursion"
> (ma-cb-en.pdf).  And I notice it is defined in
> /usr/share/texmf/tex/context/base/mkiv/math-pln.mkiv (in Debian).
> But it seems \bmatrix, \vmatrix are not defined yet.
> Is there any reason why they are not defined?
> Similar commands or environments \begin{bmatrix}...\end{bmatrix},
> \begin{vmatrix}...\end{vmatrix} are very often used in mathematical
> LaTeX documents.
> It is very useful if we can use \bmatrix and \vmatrix in ConTeXt
> documents, so please add
> \unexpanded\def\bmatrix#1%
>   {\left[\matrix{#1}\right]}
> \unexpanded\def\vmatrix#1%
>   {\left|\matrix{#1}\right|}
> in math-pln.mkiv or somewhere.

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

\definemathmatrix
  [vmatrix]
  [left={\left\lvert},right={\right\rvert}]

\definemathmatrix
  [Vmatrix]
  [left={\left\lVert},right={\right\rVert}]

\starttext

\startformula
    \startpmatrix
        \NC A \NC B \NR
        \NC C \NC D \NR
    \stoppmatrix
    \quad 
    \startbmatrix
        \NC A \NC B \NR
        \NC C \NC D \NR
    \stopbmatrix
    \quad
    \startvmatrix
        \NC A \NC B \NR
        \NC C \NC D \NR
    \stopvmatrix
    \quad
    \startVmatrix
        \NC A \NC B \NR
        \NC C \NC D \NR
    \stopVmatrix
\stopformula

\stoptext

> 
> By the way, I think it is critical to set
> \setupmathematics[ampersand=normal]

This should not be necessary in general.  Just use \NC and \NR.

> to use \matrix above but I can't find this setting in ma-cb-en.pdf
> It is great if this is added in  ma-cb-en.pdf
> 
> 
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