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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 llano[/i] [br]Origin Ver.: 7.5 Operating System:XP Hello, I am trying to fit an equation to a set of data points (x,y) and trying to calculate unknown coefficients (a and b) in the equation. The equation contains two individual summation series for a and b(a1*x^1, a2*x^2, etc... and b1*x^1, b2*x^2, etc...). The equation resembles a polynomial function, but the degree depends on how well the equation fits to the data points. Is there a way to define summation in Origin in the NLM curve fitting edit function window (under definition)? I'd like to be able to write out the equation without having to go too much into programming. Thanks! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.