close
t=[0:0.05:6]*pi;
x=cos(t);
y=sin(t);
subplot(2,2,1),plot(t,x); grid on;
subplot(2,2,2),plot(t,y); grid on;
subplot(2,2,3),plot(x,y); grid on;
subplot(2,2,4),plot3(x,y,t); grid on; ----------------畫三角形x=[-1,0,1,-1];y=[1,3,1,1];plot(x,y);axis([-3 3 -2 4]);grid on;
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