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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 StevoSn[/i] [br]Hello! I want to fit data to a function with two intervals but identical parameters. How can I do that, without fixing the parameter values in the second interval? let's say for example y = P1 + P2*x ; for 0 < x < x1 and Y = P1 * exp(P2*x) ; for x < x1 1. how can I define a function like this? 2. how can I get origin to fit on this function? Thanks a lot! Cheers Stevo [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.