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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 mmcb1234[/i] [br]Operating System: Hello, I am using origin 8.6 and am trying to fit to a complicated system of equations that is only able to be solved numerically. For example I have an equation to fit: I = A*X + B*Y where: X^2 + (Y - R - L - K1)*X + (R - Y)*L = 0 Y^2 + (2*X-2*R)*Y +(X^2 -2*R*X) = 0 Y is the dependent variable, L is the independent variable, and R,K1,K2,A, and B are constants, some of which are fixed. Is it possible to fit this system of equations without solving them explicitly? How would I go about this? Thanks for the help! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.