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+////Chapter 13  Steam Engines
+////Example 13.2 Page No 285
+///Find Mean Effective pressure
+///Input data
+clc;
+clear;
+P1=14;           //Steam is ssupplied in bar          
+P6=6;            //Pressure at the end in bar
+Pb=1.2;          //Pressure at back in bar
+a=0.1;           
+re=4; 
+//From hyperbolic process 
+b=0.4;
+
+///Calculation
+//Mean Effective pressure in N/m^2 
+Pm=P1*((1/re)+((1/re)+a)*log((1+a)/((1+re)+a)))-Pb*((1+b)+(a+b)*log((a+b)/a));
+
+
+//Output
+printf('Mean Effective pressure= %f N/m^2 \n',-Pm);