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Fit Multiple Data Files

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  Fit Multiple Data Files Jonas Sodon <heiko.anafer@web.de> - 2016-09-20 05:43 -0700
    Re: Fit Multiple Data Files Karl Ratzsch <mail.kfr@gmx.net> - 2016-09-20 16:02 +0200
      Re: Fit Multiple Data Files Jonas Sodon <heiko.anafer@web.de> - 2016-09-20 23:11 -0700

#3400 — Fit Multiple Data Files

Hi all,

supose I have 3 data files containing data from the same meassurment and I want to create ONE fit through all 3 data sets. 

Is it possible to have one fit through multiple data sets in different files? If so, how?

f(x) = a +b*x + c*x**2
fit f(x) "data1", "data2", "data3" via a,b,c 

did not work and the help section on multi-branch fitting left me even more clueless. 
 
Any help would be greatly apreciated. 
Cheers,

Jonas

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#3401

Am 20.09.2016 um 14:43 schrieb Jonas Sodon:
> supose I have 3 data files containing data from the same meassurment and I want to create ONE fit through all 3 data sets. 
> 
> Is it possible to have one fit through multiple data sets in different files? If so, how?
> 
> f(x) = a +b*x + c*x**2
> fit f(x) "data1", "data2", "data3" via a,b,c 
> 
> did not work and the help section on multi-branch fitting left me even more clueless. 

Multi-branch is for fitting more than one function & dataset with
identical parameters at the same time.

You just need to combine the files into one for fit, there are different
possibilities:

Do it permanently outside of gnuplot, or

   fit f(x) '< cat data1 data2 data3' via ...

or

    set table $data"
    plot "data1", "data2", "data3"
    unset table
    fit f(x) $data

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#3402

Thanks alot, the latter was exactly the simple solution I was hoping for.

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