figure
g_d = line(xd,yd);
hold on
set (g_d,'linestyle','none','marker','+','markeredgecolor','b');
g_a = line(x,y);
set (g_a,'color','g');
g_min = line(xmin,ymin);
set (g_min,'linestyle','none','marker','o','markeredgecolor','r','color',[1 0 0]);
g_max = line(xmax,ymax);
set (g_max,'linestyle','none','marker','o','markeredgecolor','k','color',[0 0 0]);
hold offv