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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 Forum: Origin Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies Origin Ver. and Service Release (Select Help-->About Origin): Origin 2021b (64-bit) SR2, 9.8.5.212 (Academic) Operating System: Windows 10 One function I am trying to set up includes an independent variable (I hope this is the right term in this case), which depends on the data that will be fit (i.e. it is not a constant). This variable must be derived from the worksheet itself where the data come from, but it is *not* used in the plotting of the fit. For example I have columns A (independent variable x ), B (dependent variable y), C (the weighting factor). I also have a column D which contains the additional variable (a vector of values) that has to go into the function. Is there any way to implement this in my user-defined function? Many thanks!   Check here to subscribe to this topic.