answer to earlier query | matrix within matrix



I was just reminded that I should share my 'eureka moment', on the 
chance someone else gets tripped up by the same issue I'd originally 
stumbled on.

Basically, here is what I had:

  [matrix([-203,-120],[45,-20])]

I couldn't figure out how to get the inner matrix out of the outer 
matrix (I needed the inner matrix for other purposes).


As it turns out, it was no more difficult than

mat :  [matrix([-203,-120],[45,-20])]

mat : mat[1];