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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 nora84[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 8.1 SR1 Operating System: WIN 7 Hi, I have a big problem with fitting (nonlinear). I have a table with my x/y values and created a plotted graph. I selected this function a opened the fitting menu. I created my own, new user function for fitting. I added some parameters and the function. After applying fitting and some parameters I get always the following output: Iterations Performed = 0 Total Iterations in Session = 0 Fit did not converge - reason unknown. Does anybody know, why my iterations are always 0 ??? Thanks for your help. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.