[General Information]

Function Name=SLogistic3 	; name show up in the select function dialog
Brief Description=Sigmoidal Logistic function, type 3 	
Function Type=Built-in		; source type, built-in, user-defined, external dll
Function Form=Expression	; function form;
Function Source=fgroup.SLogistic3
Number Of Parameters=3
Number Of Independent Variables=1
Number Of Dependent Variables=1


[Fitting Parameters]

Naming Method=user-defined
Names=a,b,k
Lower bounds=0.0(X,ON),0.0(X,ON),0.0(X,ON)
Upper bounds=--,--,--
Meanings=amplitude, coefficient, coefficient

[Independent Variables]

x = 


[Dependent Variables]

y = 


[Constants]


[Formula]

y = a/(1 + b*exp(-k*x))

[Constraints]


[Parameters Initialization]
sort( x_y_curve );
smooth( x_y_curve );
a = max( y_data );
k = 4.0 / fwhm( x_y_curve );
b = exp( k * xaty50( x_y_curve ) );


[Initializations]


[After fitting]


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

