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+//ANALOG AND DIGITAL COMMUNICATION
+//BY Dr.SANJAY SHARMA
+//CHAPTER 11
+//Information Theory
+clear all;
+clc;
+printf("EXAMPLE 11.44(PAGENO 529)");
+
+//given
+P_x1 = 1/2//probability of first symbol
+P_x2 = 1/4//probability of second symbol
+P_x3 = 1/8//probability of third symbol
+P_x4 = 1/8//probability of fouth symbol
+n1 = 1
+n2 = 2
+n3 = 3
+n4 = 3
+
+//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;
+L = P_x1*n1 + P_x2*n2 + P_x3*n3 + P_x4*n4;
+neta = H_x/L;
+P_neta = neta*100//efficiency in percentage
+
+//results
+printf("\n\nEfficiency = %.2f",neta);
+printf("\n\nEfficiency in percentage = %.2f percent",P_neta);