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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: display the fit function and/or fit parameters in the chart area?
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Date: Sun, 20 May 2012 21:42:34 -0700
Organization: gnuplot development team
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Nicholas Musolino wrote:

> On May 10, 11:27 pm, TonyG <tgo...@gmail.com> wrote:
>> On Monday, April 30, 2012 8:47:47 AM UTC-4, TonyG wrote:
>> > How to automate the process, instead of having to insert copied
>> > strings?
>>
>> Is it possible...?  So far, no peep from anybody...
> 
> See second item on this page.
> http://t16web.lanl.gov/Kawano/gnuplot/misc4-e.html
> 
> Copied and pasted from that site:
> 
> gnuplot> f(x)=a*x*x+b*x+c
> gnuplot> fit f(x) 'test.dat' using 1:2:3 via a,b,c
> gnuplot> set label 1 "Y=AX^2+BX+C" at 11,1225
> gnuplot> set label 2 "A = %g", a at 12,1200
> gnuplot> set label 3 "B = %g", b at 12,1180
> gnuplot> set label 4 "C = %g", c at 12,1160
> gnuplot> plot f(x),'test.dat' using 1:2:3 with yerr


That syntax is very out of date.  I'm not sure it will work any more.
Use string variables and string functions instead.
That is, instead of
   set label 2 "A = %g", a at 12,1200
you want
   set label 2 sprintf("A = %4.2f",a) at 12, 1200

and so on.

	Ethan