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+//Example 17.3
+clc
+//From figure 17.7
+disp('The nodal equations are')
+disp('I1=0.35*V1-0.2*V2-0.05*V3')
+disp('I2=-0.2*V1+1.7*V2-1*V3')
+disp('I3=-0.05*V1-1*V2+1.3*I3')
+//We need to find input impedance
+disp('Yin=dely/del11')
+disp('Zin=1/Yin')
+//In matrix form
+A=[0.35 -0.2 -0.05;-0.2 1.7 -1;-0.05 -1 1.3]
+dely=det(A)
+printf("\n dely=%f S^3",dely);
+//Eliminating first row and first column to find del11
+B=[1.7 -1;-1 1.3]
+del11=det(B)
+printf("\n del11=%f S^2",del11);
+Yin=dely/del11
+printf("\n Yin=%f S",Yin);
+Zin=1/Yin
+printf("\n Zin=%f ohm",Zin);