xk ( k=1,2,,n) y(xk) , f(x,a1, a2, ,am), as ( s=1, 2, m). , as, f(x, a1, a2, am) . , m<<n, , f(x, a1, a2, am) . , . ,
.
. xk ( k=1,2,,n) yk . , , f(x), x1, x2,,xn y1, y2, ,yn, f(xk) = yk k 1 n. f(x) , n-1. .
( , ) [1].
MatLab polyfit(). . polyfit(x,y,n) n, , . n+1, . , . , (m<<n). .
, (. 2.2.1-1), (. 2.2.1-2).
. 2.2.1-1.
. 2.2.1-2.
Matlab polyfit() , , .
2.2.1-1.
x=-5,-45, , .
Matlab Command Window, Matlab polyfit() (. 2.2.1-3). . 2.2.1-4. polival(p,z), z .
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. 2.2.1-3.
Matlab polyfit()
. 2.2.1-4.
, . - , ( ). . - .
- Matlab interp1(). : , , , , ( ), (. 2.2.1-1).
2.2.1-1
nearest() | |
linear() | |
spline() |
Matlab interp1().
x | -1 | |||
y(x) |