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+//page 25

+//Example 1.15

+clear;

+close;

+clc;

+a = [2 -1;1 3];

+disp(a,'a = ');

+b = a;              //Temporary variable to store a

+disp('Applying row tranformations');

+disp('Interchange R1 and R2');

+x = a(1,:);

+a(1,:) = a(2,:);

+a(2,:) = x;

+disp(a,'a = ');

+disp('R2 = R2 - 2 * R1');

+a(2,:) = a(2,:) - 2 * a(1,:);

+disp(a,'a = ');

+disp('R2 = R2 *1/(-7)');

+a(2,:) = (-1/7) * a(2,:);

+disp(a,'a = ');

+disp('R1 = R1 - 3 * R2');

+a(1,:) = a(1,:) - 3 * a(2,:);

+disp(a,'a = ');

+disp('Since a  has become an identity matrix. So, a is invertible');

+disp('inverse of a = ');

+disp(inv(b)); //a was stored in b

+//end