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 Nonlinear Curve Fitting with Dataset Points		  New Topic  Reply to Topic
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matteo987

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Posted - 07/15/2014 :  05:48:37 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. 9.1 Service Release 3

I would like to fit some data (metal resistivity VS temperature) to a function defined as a numerical integral (so far I can do it).

The problem is that I cannot write the integrand f(x) as a simple expression. It is indeed in the form f(x)=g(x)h(x)
where I have an expression for g(x) but only dataset points for h(x).

In my specific case h(x) is a phonon dispersion curve in the form of a two-column dataset. I would like to define an "interpolation function" on this dataset that I can then easily use as an integrand in my fitting function.

I lack both time and experience with OriginLab. I was wondering if there were any easy way to do it.

Thanks for your attention.

Hideo Fujii

USA
1582 Posts
Posted - 07/15/2014 :  4:37:05 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Does this tutorial("Fitting One Dataset as a Function of Other Datasets") help?
http://wikis/howto/index.php?title=Tutorial%3AFitting_Datasets

--Hideo Fujii
Originlab
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