function graphalot()
    for n = 1:10000; 
        bob = rand(1, 5000, "n"); 
        r = flts(bob, [%z^2 - 1; 0.5 * %z] / (%z^2 - 1.95*%z + 0.999)); 
        scf(0); 
        drawlater(); 
        clf; 
        plot2d(r'); 
        ssz = stacksize(); 
        xtitle(sprintf("iteration #%d, stack used %d", n, ssz(2))); 
        drawnow(); 
        scf(1); 
        clf; 
        drawlater(); 
        plot2d(r(1, :), r(2, :), frameflag = 3, rect = [-150, -150, 150, 150]); 
        drawnow(); 
    end
endfunction
