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//Caption:transfer_function_using_mason's_gain_formula
// example 4.4.6
//page 69
syms G1 G2 G3 G4 H1 H2;
// forward path denoted by P1,P2 and so on and loop by L1,L2 and so on
//path factor by D1,D2 and so on and graph determinant by D
// to find C/R consider D=0
P1=G1*G3*G4;
P2=G2*G3*G4;
L1=-G3*H1;
L2=-G1*G3*G4*H2;
L3=-G2*G3*G4*H2;
D1=1;
D2=1;
D=1-(L1+L2+L3);
D=simple(D)
Y=(P1*D1+P2*D2)/D;
Y=simple(Y);
disp(Y,"C(s)/R(s)=")
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