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+//ANALOG AND DIGITAL COMMUNICATION
+//BY Dr.SANJAY SHARMA
+//CHAPTER 11
+//Information Theory
+clear all;
+clc;
+printf("EXAMPLE 11.54(PAGENO 537)");
+
+//given
+P_x1 = 1/3//probability of first signal
+P_x2 = 1/6//probability of second signal
+P_x3 = 1/4//probability of third signal
+P_x4 = 1/4//probability of fourth signal
+
+//calculations
+I_x1 = -log2(P_x1);
+I_x2 = -log2(P_x2);
+I_x3 = -log2(P_x3);
+I_x4 = -log2(P_x4);
+H_x = P_x1*I_x1 +  P_x2*I_x2 +  P_x3*I_x3 +  P_x4*I_x4 //entropy
+
+//results
+printf("\n\nEntropy of the source = %.5f bits/symbol ",H_x)