ex4_6.m

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clf; t=0:.4:2*pi; hc=plot(t,sin(t),'-pentagram'); 
ht=gtext('This is the original text');

y1=get(hc,'YData'); 
set(hc,'MarkerSize',20,'LineStyle','-.','Color','k','YData',2*y1)
set(ht,'String','Updated Text','FontSize',20','Rotation',10);