Metode Numerik 2 - Universitas Indonesia
Metode Numerik 2 - Universitas Indonesia
Metode Numerik 2 - Universitas Indonesia
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52<br />
S merupakan fungsi kuadratik dalam a (j = 0, …, m):<br />
N ⎛<br />
m ⎞ N ⎛ m<br />
j<br />
2 2j<br />
( a , ..., a ) = ⎜f(x<br />
) − a x ⎟ = ⎜ ( a x + )<br />
∑ i ∑<br />
∑ ∑<br />
S 0 m ⎜<br />
j i ⎟ ⎜ j i ...<br />
i=<br />
1 ⎝<br />
j=<br />
0 ⎠ i=<br />
1 ⎝ j=<br />
0<br />
∂S<br />
∂<br />
2<br />
( a , ..., a )<br />
S<br />
0<br />
∂a<br />
k<br />
m<br />
( a , ..., a )<br />
= −2<br />
N<br />
⎛<br />
⎜<br />
f(xi)<br />
−<br />
⎝<br />
m<br />
∑ ∑<br />
i=<br />
1<br />
j=<br />
0<br />
N<br />
∑<br />
i=<br />
1<br />
0 m<br />
2k<br />
= 2 xi<br />
> 0 =<br />
2<br />
∂a<br />
k<br />
a<br />
2<br />
j<br />
x<br />
j<br />
i<br />
⎞<br />
⎟<br />
x<br />
⎠<br />
k<br />
i<br />
( k 0, ..., m)<br />
+ f<br />
( k = 0, ..., m)<br />
2<br />
⎞<br />
(x ⎟ i)<br />
⎟<br />
⎠<br />
S memiliki satu titik minimum pada nilai a (j = 0, …, m) tertentu.<br />
j<br />
j