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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 cmcelm[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Origin 2019 9.6.0.172 Operating System: Windows 10 Hi all, I am trying to create a custom function to fit a set of data to, but the fit is just producing a straight line. I do not know what I'm entering wrong. The function I want to fit to is y=-log10((10^-A*x)+B) where y is the dependent variable, x the independent, and A and B are parameters. I don't know if my equation syntax is wrong, or what the problem is. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.