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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 AOjuva[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 2020 Operating System: Windows 10 I'm trying to model a signal from a chemical polymerization reaction. The signal resembles an exponential growth function, but a single function does not fit all data. I suspect that, since the reaction has several steps (monomer->dimer->oligomer->polymer->cross-bridging), I need to use a multi-exponential function to model it entirely. Not being too familiar with Origin's function builder, I'd appreciate some hands-on help on how to define a function to be fitted. The function should be of type: f(x)=a1*exp(b1*x)+a2*exp(b2*x)+... Thanks in advance! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.