30.1.168 SRichards1
Contents
Function
![y=\left[ a^{1-d}-e^{-k\left( x-xc\right) }\right] ^{1/\left( 1-d\right) },d<1](/origin-help/en/images/SRichards1/math-02da77778d79d2e7df03097beb472504.png?v=0 "y=\left[ a^{1-d}-e^{-k\left( x-xc\right) }\right] ^{1/\left( 1-d\right) },d<1")
![y=\left[ a^{1-d}+e^{-k\left( x-xc\right) }\right] ^{1/\left( 1-d\right) },d>1](/origin-help/en/images/SRichards1/math-0b8357b9617cce6713eed5ae4f2ef98b.png?v=0 "y=\left[ a^{1-d}+e^{-k\left( x-xc\right) }\right] ^{1/\left( 1-d\right) },d>1")
Brief Description
Sigmoidal Richards function, type 1.
Sample Curve
Parameters
Number: 4
Names: a, xc, d, k
Meanings: a = top asymptote, xc = center, d = unknown, k = coefficient
Lower Bounds: a > 0.0, k > 0.0
Upper Bounds: none
Script Access
nlf_srichards1(x,a,xc,d,k)
Function File
FITFUNC\SRICHAR1.FDF
Category
Growth/Sigmoidal