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Nonlinear FittingExpand Nonlinear Fitting Surface Fitting with Multiple Peaks

Origin provides several built-in surface fitting functions which can be used to perform fitting on 3D data. The surface fitting function is similar to the nonlinear fitting function.

Surface Fitting is only available in OriginPro.

Minimum Origin Version Required: OriginPro 9.0 SR0

What you will learn

  • How to do surface fitting on matrix data.
  • How to fit the surface with multiple peaks.


This tutorial is associated with the Surface Fitting (Pro Only) folder in the Tutorial Data.opj (<Origin EXE Folder>\Samples\Tutorial Data.opj).

  1. With the matrix sheet active, click Analysis on the main menu, and then click Nonlinear Matrix Fit... to open the NLFit dialog. (Alternatively, you can plot the matrix as a 3D surface or contour, and then select Nonlinear Surface Fit... to open the same dialog.)
  2. Click Function Selection, select Gauss2D from the Function dropdown menu.
    Surface Fitting with Multiple Peaks 02.png
  3. Click Advanced, set Number of Replicas to 3, and set Peak Direction as Positive.
    Surface Fitting with Multiple Peaks 03.png
  4. Click Fit to perform a multiple peak fit and generate a report worksheet with fitting results.

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