File Exchange > Data Analysis >    Fit with Composite Functions

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File Name:
Fit with C...ns.opx
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Perform fitting by combining two or more existing fitting functions

Screen Shot and Video:

  • Purpose
    This app lets you create and fit with a composite fitting function by combining multiple functions.
  • Installation
    Download the file "Fit with Composite Functions.opx", and then drag-and-drop onto the Origin workspace. An icon will appear in the Apps gallery window.
  • Operation
    Select a Y column or make a 2D graph with a data plot active.
    Then click the app icon to bring up the dialog.
    Specify how many component functions you need, and then choose the functions.
    Adjust/fix parameters as needed and click the Fit button to perform the fitting.
    Click OK button to create a report.

Dialog Settings:

  • Input Data: Select the data for fitting.
  • Function #: Choose the category and function for each component.
  • Parameters: Table displaying parameter values.
  • Message: Displays messages from fitting.
  • Configure Report: Please refer to Configure Report.
  • Reinit: Re-initialize the fitting parameters.
  • 1 Iter.: Perform one iteration.
  • Fit: Perform fitting until converged or the iteration condition is satisfied.
  • OK: Perform the fitting like clicking Fit button, and then create report.
  • Cancel: Close the dialog and do nothing.


v1.3: Fixed bug of not working in OriginPro 2022
v1.2: Fixed bug for input data in report table if X data is row number
v1.1: Update fitted curve after changing parameter values

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