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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 oconnor[/i] [br]Origin Version (Select Help-->About Origin): 7.5 Operating System: XP Hi, I have a large number of curves that I would like to automate the fitting of with Origin C. I am trying to use the NLSF in Origin C to do this using the following code borrowed from an example somewhere: using NLSF = LabTalk.NLSF; NLSF.Init(); NLSF.PasteToPlot = 1; NLSF.Func$ = "boltzmann"; NLSF.FitData$ = strYDataName; NLSF.xBegin = 60; NLSF.xEnd = 120; NLSF.Execute("parainit"); NLSF.Fit(100); The problem is that I am not getting the same results as when I pick part of a curve (between 60 and 120 for example) manually with the Data Selector tool and then use 'Fit Sigmoidal' from the 'Analysis' menu. What I would like to know is how to perform the same fitting operation as the 'Fit Sigmoidal' function to get the results I can get manually in an automated way. Thanks, Rod. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.