[General Information]

Function Name=SLogistic1	; name show up in the select function dialog
Brief Description=Sigmoidal Logistic function, type 1 	
Function Type=Built-in		; source type, built-in, user-defined, external dll
Function Form=Expression	; function form;
Function Source=fgroup.SLogistic1
Number Of Parameters=3
Number Of Independent Variables=1
Number Of Dependent Variables=1


[Fitting Parameters]

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


[Independent Variables]

x = 

[Dependent Variables]

y = 


[Constants]


[Formula]

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

[Constraints]


[Parameters Initialization]
sort( x_y_curve );
//smooth( x_y_curve, 2 );
a = max( y_data );
xc = xaty50( x_y_curve );
x_y_curve = ln(a / x_y_curve -1);
double coeff[2];
fitpoly( x_y_curve, 1, coeff );
xc = -coeff[0] / coeff[1];
k = -coeff[1];


[Initializations]


[After fitting]


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