MATLAB CURVE FITTING TOOLBOX - RELEASE NOTES Podręcznik Użytkownika Pobierz pdf (Strona 131)

Parametric Fitting

3-55

The fit, residuals, and numerical results are shown below.

The fit appears to be reasonable for most of the data points. However, the

residuals indicate that you should include another cycle to the fit equation.

Therefore, as a third attempt, add an additional sine and cosine term to y

2

(x)

and constrain the lower bound of c

3

to be roughly three times the value of c

1

.

The fit for two cycles.

The residuals indicate that

one more cycle might exist.

The numerical results indicate

an additional 22 month cycle.

y

3

x() y

2

x() a

3

2π

x

c

3

-----





b

3

2π

x

c

3

-----





sin+cos+=

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 215 216

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