Re: [Gnuplot-info] How to fit a line in log plot or how to help converge exp better

[<HBB...@t-...>]

lyn...@fr... wrote:

> I found quite a lot of info on fitting exponential functions but could not get
> a good result with my FIT_LIMIT and FIT_MAXITER.

That's not exactly surprising.  A FIT_LIMIT of 1e-99 is preposterous.

 > I wonder if it is possible to
> fit  just  a  line  in  a  single log plot? 

Not quite --- because you don't fit to a plot.  You fit to data, among 
other things, that means that "set log y" has no effect on fits.  So you 
have to logarithmize the data yourself to get a similar effect:

	set log y
	fit log(a)-b*x 'data' using 1:(log($2)) via a, b
	plot a*exp(-b*x), 'data'

> Would there be a way to loop this over the other data columns as well?

Yes.  See "help reread".