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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 daoruaimi[/i] [br]Origin Ver.8 and Service Release 5(Select Help-->About Origin): Operating System:vista Origin Ver 8. and Service Release 5 (Select Help-->About Origin): Operating System: Origin Ver8. and Service Release 5 (Select Help-->About Origin): Operating System:vista Hi, I have a series number (x,y), I need to fit the data to get some constants. However, it is impossible to get an expression like y=f(x). the equation like y=A1*x1/A +A2*x1^4/((exp(-(A3+A4*x))/RT)*A) A,R,T are known constant A1,A2,A3,A4 are unknown constant, and to get them by fitting the data x1 is a function of x, an is the root of the equation 4*x1^4/(A-x1)=exp(-(A3+A4*x)/RT) obviously, cannot get an expression like x1=g(x) due to the high order the equation. Thus numerical curve fitting is need. however, how to use numerical and nonlinear fitting in in origin? thanks [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.