Hi Henri,
Thanks for your suggestions, they are very instructive.
However, my request is not a smart way of displaying matrices
but to know why \bmatrix and \vmatrix are not provided
in core part of ConTeXt although \pmatrix is provided already
in math-pln.mkiv
About matrices, I first found commands in your first email in
http://dl.contextgarden.net/myway/context-latex-math.pdf
(like \startpmatrix \NC A\NC B\NR \NC C\NC D\NR\stoppmatrix)
and then browsing ma-cb-en.pdf I noticed another command
like \pmatrix{A&B\cr C&D\cr}.
Now by your email, I know a command \pmatrix{A, B; C, D}
One might say ConTeXt is flexible but I've an impression
that ConTeXt is in a state of confusion/disorder.
I think it is better if a standard command is provided
by core ConTeXt or by a module etc.
Or is it ConTeXt way that each user defines his/her own commands
in setup area and uses them in text area?
I'm afraid consistency and/or portability is lost in such scenario.
BTW, I constantly convert Beamer documents into ConTeXt's
simpleslide documents recently and it is very convenient
if I can use \pmatrix{a&b\cr c&d\cr} style because it is similar
to LaTeX documents.
2019年7月3日(水) 15:42 Henri Menke
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.
Ignore my other message, this is even better:
\definemathmatrix [pmatrix] [matrix:parentheses] [simplecommand=pmatrix]
\definemathmatrix [bmatrix] [matrix:brackets] [simplecommand=bmatrix]
\definemathmatrix [vmatrix] [matrix:bars] [simplecommand=vmatrix]
\definemathmatrix [Vmatrix] [left={\left\lVert\mskip\thinmuskip}, right={\mskip\thinmuskip\right\rVert}, align=middle, simplecommand=Vmatrix]
\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
\startformula \pmatrix{A, B; C, D} \quad \bmatrix{A, B; C, D} \quad \vmatrix{A, B; C, D} \quad \Vmatrix{A, B; C, D} \stopformula
\stoptext
By the way, I think it is critical to set \setupmathematics[ampersand=normal] 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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