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M
M_U1-Visitor
1-Visitor
December 16, 2020
Solved

Adjust Bessel function to data

  • December 16, 2020
  • 2 replies
  • 4881 views

Hi,

I need to adjust a Bessel function to this data. I was unable to make it and I can't discover the error. Can someone help me?

Best answer by LucMeekes

The Bessel function will not work, note that J0 does not have a flat lower bound, like your data shows.

It may help to square the Bessel function, like this:

LucMeekes_0-1608143463055.png

Success!
Luc

2 replies

W
Werner_E25-Diamond I
25-Diamond I
December 16, 2020
I can't discover the error.

Which error?

Post your Mathcad or Prime sheet!

M
M_U1-VisitorAuthor
1-Visitor
December 16, 2020

I'm trying to use the QuickSheet of Fitting nonlinear functions to data. But my problem starts when I have to define the bessel function J0. I don't have the analytic expression for the function, so I can't use the genfit.

W
Werner_E25-Diamond I
25-Diamond I
December 16, 2020

The Bessel function J0 does not have any parameters you may twist to fit to some data.

Why do you think that you must fit with a Bessel and what modified version of Bessel do you have in mind?

Where does the problem stem from?

L
LucMeekes23-Emerald IVAnswer
23-Emerald IV
December 16, 2020

The Bessel function will not work, note that J0 does not have a flat lower bound, like your data shows.

It may help to square the Bessel function, like this:

LucMeekes_0-1608143463055.png

Success!
Luc

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