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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 MantaManni[/i] [br]OriginPro 2020 (64-bit) SR1 9.7.0.188 (Academic) Hello together, I am trying to write a script in Origin C to perform non-linear regression analysis on this formula [img]https://my.originlab.com/ftp/forum_and_kbase/Images/Frage Matheforum.png[/img] This is what I got so far: // void _nlsfdiffusionsumresistance( // Fit Parameter(s): double Aeq, double D, double H, // Independent Variable(s): double x, // Dependent Variable(s): double& y) { const double n=50; const double l=0.001; // Beginning of editable part double bb=0; double R=l*H/D; for(int ii =1; ii<=n; ii++); if(R=ii*tan(ii)); while (ii>0) { bb = (2*R^2/ii^2*(ii^2+R^2+R))*exp(ii^2*D*x/l); } y = (1-bb)*Aeq; // End of editable part I am not very used to programming, so if someone could help, that would be awesome! Thank you in advance [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.