getnab( A )

%finds the order of matrices
function na = getnab( A )

na = 1;

for r = 1:size( A, 1 )
    for c = 1:size( A, 2 )
       if( size( A.num{r,c}, 2 ) > na ) 
           na = size( A.num{r,c}, 2 );
       end
    end        
end