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abcd_to_y.m
function Y=ABCD_to_Y(abcd_param);
a=abcd_param(1,1);
b=abcd_param(1,2);
c=abcd_param(2,1);
d=abcd_param(2,2);
y11=d;
y12=-det(abcd_param);
y21=-1;
y22=a;
Y=[y11,y12;y21,y22]/b;
h_to_y.m
function Y=H_to_Y(H);
h11=H(1,1);
h12=H(1,2);
h21=H(2,1);
h22=H(2,2);
y11=1;
y12=-h12;
y21=h21;
y22=det(H);
Y=[y11,y12;y21,y22]/h11;
s_to_y.m
function Y=S_to_Y(s_param,Z0);
s11=s_param(1,1);
s12=s_param(1,2);
s21=s_param(2,1);
s22=s_param(2,2);
delta=(1+s11)*(1+s22)-s12*s21;
y11=((1-s11)*(1+s22)+s12*s21)/delta;
y12=-2*s12/delta