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gamma function

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javiers

Spain
6 Posts

Posted - 11/18/2008 : 12:21:29 PM

Hi,

is it possible to use the gamma function for curve fitting?
if so, please give some tips I would be very grateful.

thanks guys.

China
37 Posts

Posted - 11/19/2008 : 03:58:04 AM

Hi, javiers

In Origin, there is no built-in gamma function in Curve Fitting, but Origin provides a general gamma function like this.

http://www.originlab.com/www/helponline/origin8/en/appendix_3_functions/script_accessible_functions/gamma_gamma_function.htm

With this funtion, we can create a user defined function by User Defined Function Organizer.

To know more details about User Defined Fitting Function, please see this webpage.

http://www.originlab.com/www/helponline/origin8/en/mergedProjects/Tutorial/Tutorial/User_Defined_Fitting_Function_using_OC.html

For example, we want to do Curve Fitting with this Function y=A*gamma(x), where A is the Parameter.

You can select Tools: Fitting Function Organizer to bring up a dialog box, and set like below.

When you finish create user defined fitting function, you can access it like other built in function.

Emily
OriginLab Technical Services

Edited by - emily_yu on 11/19/2008 04:14:23 AM

Spain
6 Posts

Posted - 11/19/2008 : 10:17:48 AM

Hi emily thanks a lot for your help.

It is amazing it works and works great.

once again thanks a have a good day.

Javier

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