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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 mac1026[/i] [br]Origin Pro7.5 SR4 Windows's Vista Hello I am new to Origin and have been exploring it for curve fitting. I want to enter my own equation to have origin fit to my data. I have tried entering the equation using Origin C as well as an expression and y script, however, I keep getting an error message that says that my parameters are not properly initialized. I have tried various syntaxes but I keep getting the same error. I have included the equation below. Any insight would be greatly appreciated. Thanks J y = P1 + P2 / (1+exp(-(x-P4*ln(2^(1/P5)-1)-P3)/P4)) ^ P5 [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.