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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by 66de250[/i] [br]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?[img]https://my.originlab.com/ftp/forum_and_kbase/Images/asdasdaxcafasczxc.png[/img] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.