Culegere de probleme de Analiz˘a numeric˘a
Culegere de probleme de Analiz˘a numeric˘a
Culegere de probleme de Analiz˘a numeric˘a
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94 Interpolare<br />
=<br />
∞<br />
aix i<br />
i=0<br />
m<br />
qix i −<br />
i=0<br />
q(x)<br />
n<br />
pix i<br />
f−r are o rădăcină multiplă <strong>de</strong> ordinN. Pentru coeficientul luixk <strong>de</strong> la numărător<br />
avem<br />
k<br />
aiqk−1 −pk = 0, k = 0,N<br />
i=0<br />
Luămq0 = 1 s¸i pn+1 = pn+2 = ··· = pN = 0 s¸i qm+1 = qm+2 = ··· = qN = 0<br />
i=0<br />
x 5 : 1<br />
2 q3 + 1<br />
6 q2 + 1<br />
24 q1 = − 1<br />
120<br />
x 4 : q3 + 1<br />
2 q2 + 1<br />
6 q1 + 1<br />
= 0<br />
24<br />
x 3 : q3 +q2 + 1<br />
2 q1 + 1<br />
= 0<br />
6<br />
x 2 : q2 +q1 −p2 + 1<br />
= 0<br />
2<br />
x 1 : q1 −p1 +1 = 0<br />
x 0 : p+0 = 1<br />
p0 = 1, p1 = 3<br />
5 , p2 = 2<br />
20 , q1 = − 2<br />
5 q2 = 3<br />
20 , q3 = − 1<br />
60<br />
r(x) =<br />
1− 2<br />
5<br />
1+ 3 1 x+ 5 20x2 x+ 3<br />
20 x2 − 1<br />
60 x3<br />
Problema 6.5.2 Determinat¸i aproximarea Padé <strong>de</strong> grad 6 pentruf(x) = sinx s¸i<br />
n = m = 3.<br />
Solut¸ie.<br />
k<br />
akqk−i −pk = 0, k = 0,6<br />
i=0<br />
p4 = p5 = p6 = 0 q0 = 1<br />
qn = q5 = q6 = 0 a0 = 0, a1 = 1, a2 = 0<br />
sinx = x− x3<br />
3!<br />
+ x5<br />
5!<br />
− x7<br />
7! +...