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66de250

China
32 Posts
Posted - 05/02/2025 :  08:10:53 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
When fitting the exponential function, I found that the fitting degree was better when the iterative algorithm selected Orthogonal Distance Regression (pro) in the fitting window (as shown in the figure). However, after consulting the X-Function help documentation, no instructions on how to select the iterative algorithm through script commands were found (the fitting functions in the nlbeginor and nlbegino commands can only be selected from implicit functions). At present, my script is:
nlbegin iy:=([Table]Data! 1, [Table]Data! 2) func:=ExpDecay2 nltree:=tr;
nlfit 100000;
nlend 1 0;
May I ask how I should select the iterative algorithm through script commands?

YimingChen

1664 Posts
Posted - 05/05/2025 :  09:32:37 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
The nlbegin xfunction supports loading a theme of the fitting settings. So here are the steps to set the Iteration Algorithm in your script:
1. Open the Nonlinear Curve Fitting dialog.
2. Specify a fitting function, set the Iteration Algorithm to Orthogonal Distance Regression.
3. Click the triangle button to the far right of Dialog Theme at the top and choose Save As.... You can save the settings to a theme with name ODR.
4. Then you can specify the theme in your script like below:
nlbegin iy:=([Table]Data! 1, [Table]Data! 2) func:=ExpDecay2 nltree:=tr theme:=ODR;


Thanks
James
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