CODEWITHSUNDEEP
rcurve-fittinggnuplot
BioDeveloper
BioDeveloper

Reputation: 618

How to apply power fit trendline in R or gnuplot?

For a simple x-y scatter plot, in what way I can apply power fit curve using R or gnuplot? I have a file with two columns.

Upvotes: 3

Views: 9538

Answers (1)

Christoph
Christoph

Reputation: 48430

To give an example for curve fitting with gnuplot, consider the following data set data.txt:

0.5 0.8
2.4 9.3
3.2 37.9
4.9 68.2
6.5 155
7.8 198

The fit with a power law function may look like this:

set termoption enhanced
f(x) = a*x**b;
fit f(x) 'data.txt' via a,b

plot 'data.txt' with points title 'data points', \
     f(x) with lines title sprintf('power fit curve f(x) = %.2f·x^{%.2f}', a, b)

With the terminal settings

set terminal pngcairo size 800,600 font ',12'

this gives the result

enter image description here

This is, of course, the most basic way to fit, the 'specialties' depend on your actual needs.

Upvotes: 9

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