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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 LingC[/i] [br]Hello, I need to fit my data with the modulus of a complex function. I tried to use the "Imabs" command but the resulting curve do not with the simulation. I wonder if there is the correct way to define a function of modulus of a complex function. The following is what I have as a defined function, y=Imabs((-1i*a2*v+a1*(1i*g2*x-x^2+w2^2))/(v^2+(-1i*g1*x+x^2-w1^2)*(-1i*g2*x+x^2-w2^2)))+C Here a1,a2,w1,w2,g1,g2,v,C are fitting parameters. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.