NonlinearFit problem
- To: mathgroup at smc.vnet.net
- Subject: [mg52033] NonlinearFit problem
- From: Feng-Yin Chang <fychang at slac.stanford.edu>
- Date: Mon, 8 Nov 2004 03:13:12 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Hi All, Could anyone give me any suggestion for the specified fitting function f= r^a Exp[-b r]? My data point was given below, data={{0, 1.00002}, {2.31507, 26.4522}, {4.32033, 56.8265}, {6.63539, 59.6674}, {8.64066, 39.5536}, {10.9557, 21.6862}, {12.961, 10.1456}, {15.276, 4.39652}} The following way, NonlinearFit[data,f,r,{a,b}], gives the error message, FindFit::njnum: The Jacobian is not a matrix of numbers at (a,b)={1.,1.}. How should I do this fitting without the problem? Feng-Yin Chang, Institute of Physics,NCTU,Taiwan
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