fitting problem... iteration??
- To: mathgroup at smc.vnet.net
- Subject: [mg42211] fitting problem... iteration??
- From: ce.choa.phen.kee at philips.com
- Date: Mon, 23 Jun 2003 05:49:48 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
Here I have a question which I cannot think of the right explanation..
I managed to come out with the equation which i used to plot the curve,
providing that i fit the data points using NonlinearFit [data , ( A * Exp [ 1/ (wx) ] ) / ( B - x )^2 , { x , 1 / (
wx ) } , { {A ,3} , {B , 600} } ]. I specified a certain value for the A and B, whose values were what I
got from MS Excel, I am able to get the correct equation as comparing to
Excel equation. But I do not want to use MS EXcel due to certain
constraints to fit such a complicated equation.
However, if I used this function: NonlinearFit [data , ( A * Exp [ 1/ (wx) ] ) / ( B - x )^2 , { x , 1 / (
wx ) } , { A , B } ] without specifying the value, I got another equation.
May I know if this is regarding the iteration which Mathematica use to fit
or is it that there are many minima in the equation??
Is there any way of getting the correct equation while not specifying the
value for A and B?
Thanks in advance.
regards,
kee