28.1.90 InvsPoly

Function

y=y_0+\frac A{1+A_1\left( 2\frac{x-x_c}w\right) ^2+A_2\left( 2\frac{x-x_c}w\right) ^4+A_3\left( 2\frac{x-x_c}w\right) ^6}

Brief Description

Inverse polynomial peak function with center.

Sample Curve

InvsPoly.png

Parameters

Number: 7

Names: y0, xc, w, A, A1, A2, A3

Meanings: y0 = offset, xc = center, w = width, A = amplitude, A1 = coefficient, A2 = coefficient, A3 = coefficient

Lower Bounds: w > 0.0

Upper Bounds: none

Script Access

nlf_invspoly(x,y0,xc,w,A,A1,A2,A3)

Function File

FITFUNC\INVSPOLY.FDF

Category

Spectroscopy, PFW, Peak Functions