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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 kamu[/i] [br]Origin Version (Select Help-->About Origin): OriginPro 7.5 SR6 Operating System: Windows XP I am trying to fit a function which is composed of several parts. The boundaries are depending on the fit parameters. I have tried it like this (with arbitrary data and parameter) if ( 0.1 < abs(x^2-14+sqrt(gamma)) ) { u1=0; } else { u1=500000; } if ( 0.1 < abs(x^2-14-sqrt(gamma)) ) { u2=0; } else { u2=500000; } y=u1*x/(gamma^2+x^2)+u2*x/(gamma^2-x^2); I have different function but they are way to long to put here. But I hope you get the idea. The function compiles, but then I get only zeroes when I calculate the Chi-Square and fitting doesn't work then, because the Chi-Square doesn't change. Thanks for the help [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.