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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 cheolmin park[/i] [br]Origin Ver.originlab 2019 and Service Release (Select Help-->About Origin): Operating System: window 10 pro Hello. Dear friends. I fitted by origin C in user defined fitting. In the fit function, additionally, I want to extract real and imaginary value into worksheet coulomb; Do you know how to do it? ((( Importantly, the fit data is numerically merged of real and imaginary. So the y value cannot separated.))) ---------------------------------------------------------------------- void _nlsMycomplexFitFunction( // Fit Parameter(s): double a1, double a2, double a3, // Independent Variable(s): double x, // Dependent Variable(s): double& y) { double real; double imaginary; complex result=0; : : real=result.m_re; //<---- this imaginary=result.m_im; //<-----this y=real+imaginary; // End of editable part } [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.