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+//page 89

+//Example 3.15

+clc;

+clear;

+close;

+disp('Differentiation operator D is defined as:');

+D = zeros(4,4);

+x = poly(0,"x");

+for i= 1:4

+    t= i-1;

+    f = derivat(x^t);

+    printf('(Df%d)(x) = ',i);

+    disp(f);

+    if  ~(i == 1) then

+    D(i-1,i) =  i-1;

+    end

+end

+disp('Matrix of D in ordered basis is:');

+disp(D,'[D] = ');

+//end