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+//Caption:transfer_function
+// example 12.1
+//page 515
+// we are solving this problem from signal flow graph approach
+syms G H;
+// 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
+P1=1*G*1
+P2=1;
+L1=-G;
+L2=-G*H;
+L3=G*H;
+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)="); \ No newline at end of file