Re: [NTG-context] align question

18 Jul 2006

      Aditya,

Thanks for the information. Since you indicated that \startalign 
worked correctly on your system, I decided that I should first check 
to see if I had the latest Context. After updating, the problems that 
I was having disappeared. So you'll be glad to know that \startalign 
does indeed appear to work as it should. Sorry about the false alarm.

I'll try out the \startmatrix options as well to see if those will 
fit my needs better for some constructions. Thanks for the detailed 
syntax.

---Bruce

At 8:12 AM -0700 7/18/06, Aditya Mahajan wrote:
...
On Mon, 17 Jul 2006, Hans Hagen wrote:
...
Bruce H. Wagner wrote:
...
Incidentally, the reason I am using the LaTeX syntax is that we are
 translating LaTeX code into Context automatically using a perl
script, and
...
it's therefore much easier to stick to whatever LaTeX code works.
 Basically, I just want something comparable to the array environment
in
 LaTeX, which works very nicely.
Aditya is in more or less charge of the specification/tryout part of
the math
 extensions and taco/myself implement things based on that input, so i
suggest
 that the two of you come up with specs
Context supports everything that latex array provides, with a slightly
different syntax. Some extract from the update on myway on alignment
(I am still working on it)
% \def\ShowExample
%  {\hairline
%    \typebuffer
%    \hairline
%    \getbuffer}
\CONTEXT\ provides \tex{startmatrix} for generic alignment mechanism.
\startbuffer
\startformula
   \startmatrix
     \NC A \NC B \NC C \NR
     \NC a \NC b \NC c \NR
     \NC 1 \NC 2 \NC 3 \NR
   \stopmatrix
\stopformula
\stopbuffer
\ShowExample
It can take a \type<> and \type<> option which can be
used to
typeset matrices
\startbuffer
\startformula
   I = \startmatrix[left={\left(\,},right={\,\right)}]
     \NC 1 \NC 0 \NC 0 \NR
     \NC 0 \NC 1 \NC 0 \NR
     \NC 0 \NC 0 \NC 1 \NR
   \stopmatrix
\stopformula
\stopbuffer
\ShowExample
It is possible to \tex{definemathmatrix} to use the construct
repeatedly.
\startbuffer
% Paranthesis
\definemathmatrix
   [pmatrix]
   [left={\left(\,},right={\,\right)}]
% Brackets
\definemathmatrix
   [bmatrix]
   [left={\left[\,},right={\,\right]}]
% Curly braces
\definemathmatrix
   [Bmatrix]
   [left={\left\{\,},right={\,\right\}}]
% vertical bars
\definemathmatrix
   [vmatrix]
   [left={\left\vert\,},right={\,\right\vert}]
% double vertical bars
\definemathmatrix
   [Vmatrix]
   [left={\left\Vert\,},right={\,\right\Vert}]
\startformula
   I = \startpmatrix
     \NC 1 \NC 0 \NC 0 \NR
     \NC 0 \NC 1 \NC 0 \NR
     \NC 0 \NC 0 \NC 1 \NR
   \stoppmatrix
   = \startbmatrix
     \NC 1 \NC 0 \NC 0 \NR
     \NC 0 \NC 1 \NC 0 \NR
     \NC 0 \NC 0 \NC 1 \NR
   \stopbmatrix
   = \startBmatrix
     \NC 1 \NC 0 \NC 0 \NR
     \NC 0 \NC 1 \NC 0 \NR
     \NC 0 \NC 0 \NC 1 \NR
   \stopBmatrix
\stopformula
\startformula
   \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
\stopbuffer
\ShowExample
It is possible to change the alignment of columns using \type{align=}
option.
\startbuffer
\startformula
   \text{Let } A = \startpmatrix[align={left,right}]
     \NC 1 \NC 2  \NR
     \NC 3 \NC -5 \NR
   \stoppmatrix
\stopformula
\stopbuffer
\ShowExample
-- 
__________________________________________________________________________
Bruce H. Wagner             e-mail:  bruce-wagner@redwoods.edu
Department of Mathematics   phone:   707-476-4207
College of the Redwoods     fax:     707-476-4424
7351 Tompkins Hill Road     WWW: 
http://online.redwoods.edu/instruct/bwagner
Eureka, CA 95501