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// example 4.3
// find the linear interpolation polinomial
// using
disp('f(2)=4');
disp('f(2.5)=5.5');
// 1)lagrange interpolation,
P1=legrangeinterpol (2,2.5,4,5.5)
// 2)aitken's iterated interpolation,
P1=aitkeninterpol (2,2.5,4,5.5)
// 3) newton devided differance interpolation,
P1=NDDinterpol (2,2.5,4,5.5)
// hence approximate value of f(2.2)= 4.6;
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