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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 jfrorigin[/i] [br]Origin 7.5 SR2 on XP. Hi, I use the NonLinear Curve Fitting with a user defined C function. This function is defined via the code builder. myfun(double P1, double P2, double x, double & y) { P1=P1*1.0e-9; // Here is the body of the function itself // } I fit with P2 by keeping P1 constant to a value val0 in the graphical interface. However the fit does not converge properly. If I remove the line P1=P1*1.0e-9; in the program and fit by keeping P1 constant to val0*1e-9, the fit works perfectly. Is it forbidden to change the value of one parameter in the body of the fit function? I thought it would be ok, since parameters are passed by value and not by reference. Hope you can help. Thanks [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.