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+// A Texbook on POWER SYSTEM ENGINEERING
+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
+// DHANPAT RAI & Co.
+// SECOND EDITION
+
+// PART II : TRANSMISSION AND DISTRIBUTION
+// CHAPTER 9: LOAD FLOW STUDY USING COMPUTER TECHNIQUES
+
+// EXAMPLE : 9.6 :
+// Page number 238
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+Y_bus = [[-%i*10.5, 0, %i*5.0, %i*5.0],
+ [0, -%i*8.0, %i*2.5, %i*5.0],
+ [%i*5.0, %i*2.5, -%i*18.0, %i*10.0],
+ [%i*5.0, %i*5.0, %i*10.0, -%i*20.0]] // Bus admittance matrix
+
+// Calculations
+Z_bus = inv(Y_bus) // Bus impedance matrix
+
+// Results
+disp("PART II - EXAMPLE : 9.6 : SOLUTION :-")
+printf("\n[Z_bus] = \n'); disp(Z_bus)