[Gnuplot-info] fit with two inputs from file

[Me4gnu <gva...@ho...>]

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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