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T O P I C R E V I E W
daoruaimi	Posted - 07/31/2009 : 12:18:12 PM 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
1 L A T E S T R E P L I E S (Newest First)
cpyang	Posted - 08/03/2009 : 7:22:37 PM We can add this as an example to our wiki if you would provide some sample data and some background info? You can email me directly cp@originlab.com

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