[General Information]

Function Name=Exp3P1Md		; name show up in the select function dialog
Brief Description=three-parameter exponential function
Function Type=Built-in		; source type, built-in, user-defined, external dll
Function Form=Expression	; function form;
Function Source=fgroup.Exp3P1Md
Number Of Parameters=3
Number Of Independent Variables=1
Number Of Dependent Variables=1


[Fitting Parameters]

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

[Independent Variables]

x = 


[Dependent Variables]

y = 


[Constants]


[Formula]

y =exp(a+b/(x+c))

[Constraints]

[Parameters Initialization]
sort( x_y_curve );
//smooth( x_y_curve, 2 );
double flag = yatxmin( x_y_curve ) - yatxmax( x_y_curve );
x_y_curve = ln( x_y_curve );
a = yatxmax( x_y_curve );
x_y_curve = 1 / ( x_y_curve - a );
double coeff[2];
fitpoly( x_y_curve, 1, coeff, 1, 3);  
b = 1 / coeff[1];
if ( flag > 0) c = -b * coeff[0];
else c = b * coeff[0];

[Initializations]


[After fitting]


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