[General Information]

Function Name=Pow2P1	; name show up in the select function dialog
Brief Description=tow-parameter power function
Function Type=Built-in		; source type, built-in, user-defined, external dll
Function Form=Expression	; function form;
Function Source=fgroup.Pow2P1
Number Of Parameters=2
Number Of Independent Variables=1
Number Of Dependent Variables=1


[Fitting Parameters]

Naming Method=user-defined
Names=a,b
Lower bounds=--,--
Upper bounds=--,--
Meanings=coefficient,power


[Independent Variables]

x = 


[Dependent Variables]

y = 


[Constants]


[Formula]

y = a*(1 - x^(-b))

[Constraints]


[Parameters Initialization]
sort(x_y_curve);
smooth(x_y_curve);
a=max(x_y_curve);
x_y_curve = ln(a-x_y_curve);
Dataset dx;
x_y_curve.AttachX(dx);
dx = ln(dx);
double coeff[2];
fitpoly(x_y_curve,1,coeff);
b=-coeff[1];

[Initializations]


[After fitting]


[Controls]
General Linear Constraints=Off
Initialization scripts=Off
Scripts After fitting=Off

