Re: [Gnuplot-info] fit and plot problem

[Hans-Bernhard B. <HBB...@t-...>]

On 30.07.2010 10:27, wrote Amir Sabbagh:

> i need  a 2D plot for the circular fit, something like the "desired
> plot" attached. I think I am messing with the fitting function. Since
> I have a 2D set of points, i would like to have a 2D plot for the fit.

So g(x,y) is not the function you actually want to plot.  You want to 
plot the implicit curve defined by g(x,y)==0.  Your best bet for that 
would be parametric mode, plotting a circle with the properties found by 
fit:

	set parametric
	set trange [0:2*pi]
	plot 'data.txt', xa+R*cos(t), ya+R*sin(t) title "fit"


> Another point: I have tryied to pass the value of the variable "R" to
> the label with no success. Is it possible?

Yes.  See "help set label", particularly its mention of sprintf.