[Gnuplot-info] fit and plot problem

[Amir S. <ami...@gm...>]

Hi to you all,
I am trying to fit some discrete data to a circle and plot the
results. I have produced this script

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set terminal wxt enhanced
set fit logfile "Y:\\User.ASH\\controllo foratura SM ring\\Pesatura
21_07\\plots\\fitpuntoMED.log"
set size square
set samples 10000
set grid xtics ytics

#fit centers
g(x,y) = (x-a)**2 + (y-b)**2 - R**2
a=0.1
b=0.1
R = 1000
fit  g(x,y) "Y:\\User.ASH\\controllo foratura SM ring\\Pesatura
21_07\\plots\\puntoMED.txt" using 1:2:(0.001):(0.001) via a, b,R
set label 1 "Fitted Circle:\nR = R\nX_C = 0\nY_C = 0" at 390, -0.11, 0.375
plot "Y:\\User.ASH\\controllo foratura SM ring\\Pesatura
21_07\\plots\\puntoMED.txt" title "Median Point (mm)" with points pt 1
lt 7, \
g(x,y) title "Circular fit"
show grid

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the fit run smoothly but the plot does not, producing this output:
 "Y:\User.ASH\controllo foratura SM ring\Pesatura
21_07\plots\fitpuntoMED.p", line 19: undefined variable: y
where line 19 is:
g(x,y) title "Circular fit"

what I am doing wrong?

Thank you
Amir