📄 projection of input vector.m
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zuobiao = v;
x1=[0 norm(zuobiao(1,:)) ]
y1=[0 0 ]
z1=[0 0]
% draw v(1)
line(x1,y2,z1,'Color','r');
angle = acos(zuobiao(1,:)*zuobiao(2,:)'/(norm(zuobiao(2,:))*norm(zuobiao(1,:))));
x2 = [0 norm(zuobiao(2,:))*cos(angle) 0]
y2 = [0 norm(zuobiao(2,:))*sin(angle) 0]
z2 = [0 0]
line(x2,y2,z2,'Color','g');
angle = acos(zuobiao(1,:)*Q/(norm(Q)*norm(zuobiao(1,:))));
x3 = [0 norm(Q)*cos(angle)]
y3 = [0 norm(Q)*sin(angle)]
z3 = [0 norm(Q)]
line(x3,y3,z3,'Color','b');
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