% mm1908.mx =[0     -0.31786        1.095       -1.874      0.42818      0.89564 ... 0.73096      0.57786     0.040314      0.67709       0.5689     -0.25565];y =[-0.54648     -0.84676     -0.24634      0.66302      -0.8542      -1.2013...     -0.11987    -0.065294       0.4853     -0.59549     -0.14967     -0.43475];
z = zeros(1,12); % no z component for now%tri = delaunay(x,y);
[k,a]=convhull(x,y);plot(x,y,'o',x(k),y(k))title('Figure 19.8: Convex Hull')
axis([-2 1.5 -1.5 1])