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+//Chapter 9
+//Example 9.7
+//page 355
+//To evaluate Zbus using Current Injection method 
+clear;clc;
+
+disp("We can approach this problem using XCOS simulation")
+disp("In this simulation");
+disp("1)For injecting unit current at bus1 keeping bus2 open circuit,we use a current source of 1 unit which is switched on from t=0 to t=2. During this period we can observe the voltage waveforms of V1 and V2 and compare with the results given in the textbook");
+disp("2)For injecting unit current at bus2 keeping bus1 open circuit,we use a current source of 1 unit which is switched on from t=4 to t=6. During this period we can observe the voltage waveforms of V1 and V2 and compare with the results given in the textbook");
+
+Z11=7;
+Z21=4;
+Z12=Z21;
+Z22=6;
+
+Zbus=[Z11 Z12;Z21 Z22]