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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 Breadfan[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 8.5.1 SR2 b315 Operating System: win7 Hello there, im not really a professional in origin programing, and i have a problem fitting some data. The original function is about percolation: log(k) = log(k0)+t*log(x+x0) where k is the conductivity of the komposit material k0 is the conductivity of the pure polymer matrix t is the parameter i want to determine x is the mass ratio of condutive particles in the polymer x0 is the critical percolation value i want to determine I tried several equations in "non linear fitting", but I either have problemes with "not valid equation" if I enter "log(k)=..." or nothing is calculated by origin. So my questio is: what do I have to do to get a fit? [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.