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T O P I C R E V I E W
daoruaimi	Posted - 07/31/2009 : 12:44:17 PM 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=A1x1/A +A2x1^4/((exp(-(A3+A4x))/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 4x1^4/(A-x1)=exp(-(A3+A4x)/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
2 L A T E S T R E P L I E S (Newest First)
larry_lan	Posted - 08/03/2009 : 11:03:27 PM Hi: We don't support such function now. Thanks Larry OriginLab Technical Services
daoruaimi	Posted - 07/31/2009 : 12:47:05 PM here is the plot

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