28.1.60 ExpGrow2

Function

y=y_0+A_1e^{(x-x_0)/t_1}+A_2e^{(x-x_0)/t_2}

Brief Description

Two-phase exponential growth with time offset, x0 should be fixed.

Sample Curve

CFF Image188.jpg

Parameters

Number: 6

Names: y0, x0, A1, t1, A2, t2

Meanings: y0 = offset, x0 = center, A1 = amplitude, t1 = width, A2 = amplitude, t2 = width

Lower Bounds: none

Upper Bounds: none

Note: different initial parameters are used for t1 and t2 so as to make sure t2 > t1 in the fitting results.

Script Access

nlf_expgrow2(x,y0,x0,A1,t1,A2,t2)

Function File

FITFUNC\EXPGROW2.FDF

Category

Baseline, Exponential, Origin Basic Functions