[NTG-context] typesetting a formula as a figure

[Dalyoung Jeong]

Dear Idris, Aditya, and Wolfgang,

Thank you for the replies.

Removing \start-stop formula and using \vcenter worked well.
However, adding $\displaystyle ...$ gave the strange output. The  
location of the captions are not under the matrix. It looks like that  
there are four columns, "matrix cap matrix cap".

I have one more question.

Is it possible to display three figures in a triangular shape as  
following?

				<  figure 1 >

			< figure 2>   <figure 3>

I tried to use \srartcombination[3*2] ... using a dummy blank figure.  
But because of the figure 1, there is a wide blank spaces between two  
figures.

Thank you so much.

Best regards,

Dalyoung