All Forums  Origin Forum for Programming  LabTalk Forum  multiple independent variables in nlbegino

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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 phyo[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 64Bit b9.3.226 Operating System: Windows 7 Pro My question is similar to the one discussed here: http://www.originlab.com/forum/topic.asp?TOPIC_ID=7865 but I have a newer version of Origin, so the workaround suggested in that thread does not work. Briefly, I would like to fit data in column 2 (type y) with a linear combination of columns 4 and 5 (both type x). I have created a user-defined function in the Fitting Function Builder with two independent variables (a and b), one dependent variable (f), and two parameters (C1 and C2). The function is f = C1*a + C2*b. The function works using manual data selection with Nonlinear Implicit Curve Fit, but I am not able to run the function in my script: nlbegino iy:=(4,5,2) func:=UseReference nltree:=tt; Returns the error: "Please select at least one XYRange." Does anyone have advice? Thanks so much! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.