2.6 三維圖形繪製&2.7 四維圖形繪製

      >> t=0:0.1:2*pi; x=t.^3.*exp(-t).*sin(3*t); y=t.^3.*exp(-t).*cos(3*t);z=t.^2; plot3(x,y,z),grid >> stem3(x,y,z) >> plot3(x,y,z),grid >> plot3(x,y,z),grid >> [x,y]=meshgrid(-3:0.1:2,-2:0.1:2)

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