Math cases

Math cases

[Jack Hill]

Dear list,

I'm using ConTeXt version 2021.07.22 19:16 and the following code 
typesets both columns in math mode

\starttext
\startformula
\delta_{ij} =
\startcases
\NC 1 \NC if i = j \NR
\NC 0 \NC otherwise \NR
\stopcases
\stopformula
\stoptext

The wiki states that the second column should be typeset in text mode. 
Is this a bug or does ConTeXt now typeset the second column in math mode 
by default?

Thanks,
Jack
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Re: Math cases

[Aditya Mahajan]

On Thu, 22 Jul 2021, Jack Hill wrote:

> Dear list,
> 
> I'm using ConTeXt version 2021.07.22 19:16 and the following code 
> typesets both columns in math mode
> 
> \starttext
> \startformula
> \delta_{ij} =
> \startcases
> \NC 1 \NC if i = j \NR
> \NC 0 \NC otherwise \NR
> \stopcases
> \stopformula
> \stoptext
> 
> The wiki states that the second column should be typeset in text mode. 
> Is this a bug or does ConTeXt now typeset the second column in math mode 
> by default?

Yes, we felt that it was more consistent with other align mechanisms to default to math. So, for the 2nd column, we now have \NC for a "normal" (i.e., math) column and \TC for a text column. So you can use:

\startformula
\delta_{ij} =
\startcases  
\NC 1 \TC if $i = j$ \NR
\NC 0 \TC otherwise \NR
\stopcases             
\stopformula           
\stoptext  

Aditya
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webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Math cases

[Jack Hill]

Thank you.
I've updated the wiki to reflect those changes. The wiki's version of 
ConTeXt still seems to use the old \NC and \MC commands though.

Jack
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Math Cases

[Aditya Mahajan]

Is it possible to number each part of the cases environment. I want

\startformula
a = \cases{
   b, & \text{ if something} \cr
   c, & \text{ if something else} \cr}
\stopformula

to come out as
       { b   if something         (1)
  a =  {
       { c   if something else    (2)

Also, is it possible to have subnumbered equations, that is can I get 
(1a) and (1b) instead of (1) and (2).

Thanks,
Aditya

-- 
Aditya Mahajan, EECS Systems, University of Michigan
http://www.eecs.umich.edu/~adityam || Ph: 7342624008