Help: Extrapolation with a nonlinear curve?

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Khanh 2014 年 10 月 29 日

Hi everybody,

I have two vectors:

x=10^5*[1.1950 4.0436 7.5822  ]
y=[2.3620 4.3620 6.3620]

y=f(x) is a polynomial curve.

I want to find y-value at x = 1.0465*10^9 I tried to extrapolate with fit('pchip') but I couldn't get the result I desired.

May I know how to do it?

Thanks.

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