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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 esacay[/i] [br]Origin 9.0.0. B45 Windows 7 I am trying to fit a collection of data points using the NLFit dialog. The overall function that I need to use is a sum of 3 separate functions [F(x) = A(x)+B(x)+C(x)]. How do I specify that one of my separate functions is only included to a certain point? ie. B(x) = N*exp[(x-x0)/B)], for x<x0 B(x) = 0, for x>= x0 ES [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.