Thanks, the framed bit is fine, except that the base of the frame is aligned
with the exercise number "(a)", whereas I'd like the top line of the
equations aligned with the (a)...

I'll keep fiddling.  This is one of those occasions which makes the
conversion from LaTeX to ConTeXt tricky for a beginner!

Thanks again,
Alasdair

On Sat, May 14, 2011 at 11:23 AM, Aditya Mahajan <adityam@umich.edu> wrote:

> On Sat, 14 May 2011, Alasdair McAndrew wrote:
>
>  Hello,
>>
>> I'm trying to typeset some linear algebra exercises for my students; the
>> exercises will be within a table, and each second element will be a system
>> of linear equations.  This sort of thing:
>>
>> \starttable[|l|M|l|M|]
>> \NC (a) \NC %
>>
>>
>> \startmathalignment[n=7,align={right,middle,right,middle,right,middle,right}]
>>     \NC 3x\NC +\NC 6y\NC -\NC 2z\NC =\NC -13\NR
>>     \NC -6x\NC -\NC 9y\NC +\NC 5z\NC =\NC 22\NR
>>     \NC 3x\NC +\NC 3y\NC -\NC 5z\NC =\NC -13\NR
>>   \stopmathalignment
>> \NC (b) \NC %
>>
>>
>> \startmathalignment[n=7,align={right,middle,right,middle,right,middle,right}]
>> \NC x\NC +\NC 3y\NC +\NC 3z\NC =\NC -4\NR
>> \NC x\NC +\NC 4y\NC +\NC 5z\NC =\NC -5\NR
>> \NC 2x\NC +\NC 4y\NC +\NC 3z\NC =\NC -5\NR
>> \stopmathalignment
>> \NC\AR
>> \stoptable
>>
>> But this doesn't work.  There seems to be a problem with the mathalignment
>> environment within the table.  What do I need enclose these in so that
>> they
>> will be treated as displayed equations within the table environment?
>>
>
> (Untested): \framed[align=normal,width=fit]{\startformula
> \startmathalignment ... \stopmathalignment \stopformula}
>
> math alignment is a display math environment, and must be inside a
> \startformula ... \stopformula.
>
> Two comments:
>
> 1. You know about \definemathalignment, right?
> 2. I think that this effect can be obtained more easily using
>
> \startitemize[two,columns,a]
>  \item ...
>  \item ..
> \stopitemize
>
> but you might need to insert a negative \vskip (or \blank) to get matrix to
> align with the item symbol.
>
> Aditya
>
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