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+////Chapter 13  Steam Engines
+////Example 13.8 Page No 288
+////Find Diagram factor
+//Input data
+clc;
+clear;
+P1=10;                  //Inlet pressure
+Pb=1;                    //Back pressure
+rc=3;                    //Expansion ratio
+a=12.1;                  //Area of indicator diagram
+b=7.5;                   //Length of indicator diagram 
+S=3;                     //Pressure scale
+
+
+//Calculation
+Pm=round((P1/rc)*(1+log(rc))-Pb ); //Therotical mean effective pressure Pm
+Pma=a/b*S;                        //Actual mean effective pressure Pma
+K=Pma/Pm;                         //Diagram factor 
+
+///Output
+printf('Therotical mean effective pressure= %f bar \n',Pm);
+printf('Actual mean effective pressure= %f bar \n',Pma);
+printf('Diagram factor= %f \n',K);