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15.3.4.4 The Fitting Function Builder


The Fitting Function Builder provides a user-friendly wizard to guide you through the steps of creating or editing a fitting function. The wizard includes the following pages: Name and Type, Variables and Parameters, Function Body, Parameter Initialization Code, Bounds and General Linear Constraints, Derived Parameters, and Script Before or After Fitting.

Each page of the wizard contains two panels. The left panel offers relevant hints and examples. The right panel offers options for customizing your user-defined function. Click the Ffb wrap.png or Ffb unwrap.png button to hide or reveal the left panel.

There are several ways to access this tool:

  1. Press F8.
  2. In Origin’s main menu, click Tools, and then click Fitting Function Builder.
  3. Click the Builder button Ffb ffo buildbutton.png in the Fitting Function Organizer Dialog.

It is much easier to create and edit functions with the Fitting Function Builder than with the Fitting Function Organizer. With the Fitting Function Builder, you can set options in all wizard pages, or skip pages and leave defaults.

Ffb home 1.png
NOTE:
  • If you want to define a peak function to use in Peak Analyzer, you must put the peak function in PFW category.
  • If you want to define a function to fit your baseline ( OriginPro ) in Peak Analyzer, you must put the user-defined function into the Baseline category.
  • If you want to define a peak function available in Quick Peaks Gadget or Multiple Peak Fit tool, the user-defined peak function needs to be moved to the Peak Functions category.
  • If you want to define an implicit fitting function to be used in implicit curve fit, you must put the user-defined function into the Implicit category.
  • If you want to define a surface fitting function to be used in 2D surface fit, you must put the user-defined function into the Surface Fitting category.
  • If your function isn't defined in the above categories, you can go to Tools: Fitting Function Organizer. Move or share your functions to the above categories.
Topics covered in this section:
  • A Simple Example
  • The Goal Page
  • The Name and Type Page
  • The Variables and Parameters Page
  • The Function Body Page
  • The Parameter Initialization Code Page
  • Defining a Peak Function
  • The Bounds and General Linear Constrains Page
  • The Derived Parameters
  • The Script Before Or After Fitting Page
  • The Integrand Page
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