Gnuplot: plotting multiple data with multiple fits on one plot

Question

My question is regarding how I can plot multiple data lines with each having their own fit in one plot?

gnuplot> plot 'data.dat', f(x) via a,b
gnuplot> replot 'data2.dat', f(x) via a,b

This doesn't allow me to plot multiple fits even when I redefine the fitting for f(x) to fit data2.dat. I also tried using another name for the function for data2.dat eg. g(x) and then fitting that but then still the fit for the first one dissappears. So I only get one fit on the plot.

How do I get multiple data with each showing their own fit on one plot?

Please do ask if more info is needed, thanks!

You also need different variables for the second fit, because gnuplot saves the fit result in the global fitting variables you specify with via — Christoph
– Christoph, Commented Jul 31, 2016 at 7:17

Vinicius Placco · Accepted Answer · 2016-07-30 23:42:13Z

2

You can do separate fits, then plot both files and fits. Assuming these are linear fits just for simplicity:

f(x) = a*x+b
g(x) = c*x+d

fit f(x) 'data.dat'  via a,b
fit g(x) 'data2.dat' via c,d

plot 'data.dat',  f(x),\
     'data2.dat', g(x)

answered Jul 30, 2016 at 23:42

Vinicius Placco

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