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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 Angel Torriero[/i] [br]Hi, I'm trying to build a fit function with Origin C which includes a summation function like y=((2*z*96485*A*)/L)*((1+2*sum(n=1 -> 100)exp((-4*n^2*D*x)/L^2) How can I define the summation function? Can anyone please help me with the coding? Thank you very much in advance, Regards, Angel [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.