function b = formb(n,ts)

% forms complex matricex flows for 2 <= n <= 9

 bts = [2*ts^2; sin(0.2*ts); cos(0.2*ts^2)-1i ;-2/(2*ts^2+2); exp(ts^0.5)+2i*ts;...
     2i*(ts-1i*ts^0.3); 3-2i*ts; 2/(ts^2+3); 5*ts*cos(0.4*(ts-1))];
 
 b = bts(1:n); % + .67*1i*ones(n,1) ;
        
          
         