PWL3

Function

$y=a_1+k_1x~~~~~~~~~~~~~(x<x_{i1})$

$y=y_{i1}+k_2(x-x_{i1})~~~~~(x_{i1}\le x<x_{i2})$

$y=y_{i2}+k_3(x-x_{i2})~~~~~(x\ge x_{i2})$

$y_{i1}=a_1+k_1x_{i1}$

$y_{i2}=y_{i1}+k_2(x_{i2}-x_{i1})$

Piecewise linear function with three segments.

Number: 6

Names: a1, k1, xi1, k2, xi2, k3

Meanings: a1 = Intercept, k1 = Slope, xi1 = Intersection, k2 = Slope, xi2 = Intersection, k3 = Slope

Lower Bounds: none

Upper Bounds: none

nlf_PWL3(x,a1,k1,xi1,k2,xi2,k3)

FITFUNC/PWL3.FDF