Plotrobber

A prettier DSL for Gnuplot and Ruby.

Don’t write this:

Gnuplot.open do |gp|
  Gnuplot::Plot.new( gp ) do |plot|
  
    plot.xrange "[-10:10]"
    plot.title  "Sin Wave Example"
    plot.ylabel "sin(x) and cos(x)"
    plot.xlabel "x"
    
    plot.data << Gnuplot::DataSet.new("sin(x)") do |ds|
      ds.with = "lines"
      ds.linewidth = 4
    end

    plot.data << Gnuplot::DataSet.new("cos(x)") do |ds|
      ds.with = "lines"
      ds.linewidth = 2
    end
  end
end

Do write this:

require 'plotrobber'

plotting {
  plot('Sine Wave Example') {
    xlabel 'x'
    xrange '[-10:10]'
    ylabel 'sin(x)'

    show 'sin(x)', with: 'lines', linewidth: 4 
    show 'cos(x)', with: 'lines', linewidth: 2 
  }
}

Even more convenient:

plot('Fit some data') {
  fn = fit SOME_DATA, [1,3] # Find linear fit using columns 1 and 3.

  show fn                   # Plots the line of best fit
  candlesticks SOME_DATA    # Plots candlesticks using 1:3:2:6:5 
}

Installation

The usual:

gem 'plotrobber'

Why “plotrobber”?

Plot for gnuplot. Robber. Robbe. Robb. Rob. Rb. Ruby.