t=0:pi/18:2*pi;
ya=sin(t);
yb=sin(t+pi*2/3);
yc=sin(t-pi*2/3);
ia=sqrt(2/3)*(ya-yb/2-yc/2)/2;
ib=sqrt(1/2)*(yb+ya/2);
theta=pi*3/2;
im=cos(theta)*ia+sin(theta)*ib;
it=-sin(theta)*ia+cos(theta)*ib;N>
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