Gnuplot is a very powerful tool to plot scientific data. This is a Ruby wrapper around Gnuplot with a syntax closely following Gnuplot's.
First you must install Gnuplot. Follow the instructions at the Gnuplot website:
Then install the Ruby gem:
gem install gnuplotter
All done!
#!/usr/bin/env ruby
require 'gnuplotter'
data1 = [
[0, 0, 0.5, 0.5],
[0, 1, -0.5, 0.5],
[1, 1, 1, 0]
]
data2 = [
[10, 10, 1.5, 1.5],
[10, 11, -1.5, 1.5],
[11, 11, 11, 10]
]
gp = GnuPlotter.new
gp.set title: "Foobar"
gp.set terminal: "dumb"
gp.add_dataset(using: "1:2:3:4", with: "vectors nohead", title: "'foo'") do |plotter|
data1.map { |d| plotter << d }
end
gp.add_dataset(using: "1:2:3:4", with: "vectors nohead", title: "'bar'") do |plotter|
data2.map { |d| plotter << d }
end
puts gp.plot
See more examples in the examples/ directory.
gnuplotter have a to_gp method that dumps a standalone Gnuplot script including
data, which is very useful for debugging and testing. For the above example
the output is:
set title "Foobar"
set terminal dumb
plot "-" using 1:2:3:4 with vectors nohead title 'foo', "-" using 1:2:3:4 with vectors nohead title 'bar'
0 0 0.5 0.5
0 1 -0.5 0.5
1 1 1 0
e
10 10 1.5 1.5
10 11 -1.5 1.5
11 11 11 10
e
Copyright 2015 Martin Asser Hansen [email protected]
GPL/v2