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+//page 363

+//Example 10.4

+clc;

+clear;

+close;

+disp('a = [x1 x2]');

+disp('b = [y1 y2]');

+disp('f(a,b) = x1*y1 + x1*y2 + x2*y1 + x2*y2');

+disp('so, f(a,b) = ');

+disp('[x1  x2]  *  |1   1|  *   |y1|');

+disp('              |1   1|     |y2|');

+disp('So the matrix of f in standard order basis B = {e1,e2} is:');

+fb = [1 1;1 1];

+disp(fb,'[f]B = ');

+P = [1 1;-1 1];

+disp(P,'P = ');

+disp('Thus, [f]B'' = P''*[f]B*P');

+fb1 = P' * fb * P;

+disp(fb1,'[f]B'' = ');

+//end