if mq==[1 2]
  subplot(2,1,1)
  axis([-5 5 -0.1 1.1])
  xi = x/max(t,1e-10);
  htrue = (xi - 2).^2 / 9;
  htrue(find(xi<-1)) = 1;
  htrue(find(xi>2)) = 0;
  hold on
  plot(x,htrue,'r')
  legend('computed','true')
  hold off

  subplot(2,1,2)
  axis([-5 5 -.5 .5])
  utrue = 2*(1-sqrt(htrue));
  hutrue = htrue.*utrue;
  hold on
  plot(x,hutrue,'r')
  legend('computed','true')
  hold off
end