30.1.181 Weibull3

Function

$S=\frac{x-x_c}{w_1}+\left( \frac{w_2-1}{w_2}\right) ^{\frac 1{w_2}}$

$y=y_0+A\left( \frac{w_2-1}{w_2}\right) ^{\frac{1-w_2}{w_2}}\left[ S\right] ^{w_2-1}e^{-\left[ S\right] ^{w_2}+\left( \frac{w_2-1}{w_2}\right) }$

Amplitude version of Weibull peak function.

Number: 5

Names: y0, xc, A, w1, w2

Meanings: y0 = offset, xc = center, A = amplitude, w1 = width, w2 = width

Lower Bounds: w1 > 0.0, w2 > 0.0

Upper Bounds: none

nlf_weibull3(x,y0,xc,A,w1,w2)

FITFUNC\WEIBULL3.FDF