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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 luke419[/i] [br]1. I'd like to build a new function for fitting process as follows. y = A*exp((-(t/Tau)^beta) Here, t,y: variable, A,Tau,beta are parameters It is possible in Origin program? Otherwise, it is impossible to include beta as parameter and should we keep beta as constant and perform fitting process varying beta instead? 2. This is the most important question. Would you let me know what I should write for items in new function tab for it (if the fitting process is possilble, for the case of parameters of A,Tau,beta, otherwise for the case of those of A,Tau)? Especially, I'd like to know what I should insert in "parameters setting" and "parameter initialization" items respectively in detail. Best regards, Luke [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.