Problems of NonlinearFit
- To: mathgroup at smc.vnet.net
- Subject: [mg63577] Problems of NonlinearFit
- From: Gavin <qunweidart at yahoo.com>
- Date: Fri, 6 Jan 2006 05:24:20 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
The model is something like
B1=I1*Sum[Func[m],{m,n1}]
B1=I2*Sum[Func[m],{m,n2}]
B1=I3*Sum[Func[m],{m,n3}]
Then B=B1+B2+B3
Then I need to find the best value of I1, I2, I3, n1, n2, n3 to fit the data I have. But it's not working:( The message is like "General::ivar: 1.` is not a valid variable." , "FindFit::njnum: The Jacobian is not a matrix of numbers at ....", etc.
If I give values to n1, n2, n3 and just fit to find I1, I2, I3, then it's working well. What do I need to do or should I use another fit?
Thank you!
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