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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 bradwurst[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 9.1 0G b275 Operating System: Windows 7 Hallo community, I want to perform two independent nonlinear asymptotic fits with: (1) y(x) = A(x->infinity) + B*x^(-3) (2) y(x) = A(x->infinity) + B*exp(-x+1) + C*exp(-x+1)^2 I've tried to implement those fits to origin, but it doesn't work, because I have huge problems to write the correct Origin C code. Can you help me? Thanks, Jan [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.