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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 curvefitting[/i] [br]Dear all, I have a question about curve-fitting with Origin 8.0 My problem is, that I have a function that depends on two variables and several parameters, so that I have three columns in my worksheet (y, x1 and x2). As usual, I use the nonlinear curve-fitting tool to user-define the function and the code-builder to check the syntax. When I open this user-defined function to do the fitting of my dataset in the NLSF-Window, I get the error message "Vector operation dimension check error". Despite this message I can still fit my data, but the results I get are completely off and the fit is very bad. Still the programs states that the fit converged. It would be very kind if anybody could tell me what the mentioned error-message means? Maybe this is the key to the very bad fitting results. Thanks already ! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.