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Topic: Fitting using an equation that contains an integration part??
Replies: 4   Last Post: Jan 25, 2011 8:04 AM

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Amr Sadek

Posts: 9
Registered: 2/13/10
Re: Fitting using an equation that contains an integration part??
Posted: Jan 25, 2011 7:28 AM
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Torsten Hennig <Torsten.Hennig@umsicht.fhg.de> wrote in message <1981347534.5321.1295947244714.JavaMail.root@gallium.mathforum.org>...
> > > Hello:
> > > I'm using a nonlinear function to fit the
> > > experimental data. But the custom function

> > contains
> > > an integration part.
> > > The function for example is;
> > > I(T)=A.*quad(exp(A/T)).
> > > T->Independent Variable, I->Response Variable, and

> > A
> > > is a fitting parameter.
> > >
> > > How can I write this code in the GUI m file????

> >
> > int(exp(a/x) dx) = x exp(x/x) - a*expint(a/x)

>
> Sorry, should read
> int(exp(a/x) dx) = x exp(a/x) - a*expint(a/x)
>

> >
> > For expint look at
> > http://www.mathworks.com/help/techdoc/ref/expint.html
> >
> > Best wishes
> > Torsten.


Thank you very much. But what if the integral has a limited range ex; from To to Tf??



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