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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 Tucko[/i] [br]Hello, I have a set of data (x,y) and I would like to fit this curve using the following function : y=a+(b-a){1-exp[-(integral(MyIntegral,LowerLimit=0,UpperLimit=x)]} with MyIntegral=dx/(A*exp[B/c+C/D(x)]] D(x)=y^(-1/e) here A,B,C are fitting parameters and a,b,c,e are constants. I have been trying the fitting function builder and the inclusion of integration during fitting but I do not get a good result. Thanks for your help [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.