Re: [Gnuplot-info] GNUPLOT - Fitting Multiple Text files

[Thomas S. <t.s...@fz...>]

the light flux from the two light sources seems to be totally independent,
that's what the function
> total_flux(x) = K*flux_A(x) + L*flux_B(x)
suggests. so there is no need to do a combined fit. just fit the two
curves separately.

otherwise, if the x-values are all the same in corresponding lines of both
data sets, you may combine the data sets outside of gnuplot and then
work with the combined data file. on unix-like system you may use the
'join' command.


super zach wrote:
> 
> Hi all
> 
> I am trying to fit a function that takes data from two files.  Is there a
> way to do this using GNUPLOT?
> 
> For example:  
> 
> I am trying to fit a lightcurve by considering light coming from two
> sources, lets call them A & B.  
> 
> I thus have two text files A.dat & B.dat that each contain three columns:
> time / flux / flux error
> 
> I have an equation I want to fit to these data files that roughly equates
> to (though is actually more complicated):
> 
> total_flux(x) = K*flux_A(x) + L*flux_B(x)         where K & L are
> constants I want to determine by fitting.
> 
> Is there a way to do this?  I have discovered "fit multi-branch" but that
> seems to fit the same equation to two datasets, which is not the same as
> what I am trying to do here.
> 
> Many thanks in advance.
> 
> Best,
> Zach
> 

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