Re: [Gnuplot-info] fit with two inputs from file

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

for fitting a two-dimensional function you need 4 data columns
"x:y:z:weight", see:
http://www.gnuplot.info/docs/node82.html

and if your data columns are - as an example -  arranged like this:
#line_number weight x y z
1 0.5 7. 6. 8.
then the fit command would be:
fit ... using 3:4:5:2 ...


Me4gnu wrote:
> 
> 
> Hey,
>  
> I want to do a fit where that am using two input from my data file and one
> parameter, but I cannot really figure out how to do that (or if its even
> possible :-)).
>  
> I was thinking of (for instance) :
>  
> d(x,y)= a*(x-y)
>  
> fit d(x,y) "data.dat" u 1:2:3 via a
>  
> But now it is not really clear for me .... how I can specify in the above
> line that is has to take x from column 2 and y from column 3 (for
> instance).
> Because in the above 1:2:3 is saying horizontal, vertical and error.
>  
> Anybody an idea?
>  
> Thanks!
> 

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