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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 Alexander_1987[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 8.5 Operating System: Windows XP Dear all, I am a complete beginner in this, and therefore I tried to follow the tutorial to create function: a=a0+k*D^n here is the tutorial to a bit different function: http://qhwiki.originlab.com/~originla/howto/index.php?title=Tutorial:User_Defined_Fitting_Function_using_OC However this tutorial says to enter some initial values of parameters. Can somebody explain to me what does this mean? I have no idea what my initial values are. I just have experimental plot and this function. All I get is a red message that parameters were out of range :( I look forward to replies. Kindest Regards, Alexander [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.