%
% Example 2 from Sec 1.2
%

A = [0 -3 -6 4 9; -1 -2 -1 3 1; -2 -3 0 3 -1; 1 4 5 -9 -7]
A([4,1],:) = A([1,4],:)
A(2,:) = A(2,:) + A(1,:)
A(3,:) = A(3,:) + 2 * A(1,:)
A(3,:) = A(3,:) - (5/2) * A(2,:)
A(4,:) = A(4,:) + (3/2) * A(2,:)
A([4,3],:) = A([3,4],:)
