Re: [fityk-users] Fitting with Integral Equation

[Marcin Wojdyr]

On 20 May 2013 13:58, Matteo Sesia <matte...@gmail.com> wrote:

> I would really need to fit my data with an integral equation. Is there any
> reasonably simple way to do it?

Depends on the equation (you can write what equation you have in mind).
Fityk doesn't not understand integrals in general, but it knows how to
calculate some special functions defined using integrals, such as
Voigt.

Marcin

[Matteo Sesia]

The function to be integrated is:

x^5/(sinh(x))^2

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Matteo Sesia

[Marcin Wojdyr]

indefinite integral? like this:
http://integrals.wolfram.com/index.jsp?expr=x^5%2F%28sinh%28x%29%29^2

[Matteo Sesia]

Sure, but then I need a someway to compute polylog functions.

[Marcin Wojdyr]

yes, it's not a solution.
I'm afraid there is no simple way to do this.
One way, but not really good, is to differentiate the data.
A hard way (that would involve programming) would be to add
polylogarithm functions to the program. I won't have time to do this
soon, at least not in the coming weeks.
So maybe the simplest solution is to find a different program for this.

Best,
Marcin