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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 kimikimono[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 8.0 SR0 Operating System:W7 Hello everybody [:p] I'm trying to fit peak curves with the following expressions: y=((2*3,1416*(ct-1))^(-0,5))*x/exp((-(x-1)^2)/(2*(ct-1))), and y=ln((x*(ct^(0,5))/(x*ln(ct))))*((ct/(2*3,1416*ln(ct)))^(0,5))*(exp(-0,5*(ln(x*(ct^0,5)))^2)/(ln(ct)))/(exp(0,5*ln(ct))), being just y=f(x) and ct a constant value that I must set, not even iterate it... Those functions should work since I actually obtained "y" data from them (then, this is a double-checking for the equations). Nor the curve-fitting tool neither the simulation works Any clue??? Thanks a lot Jose [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.