File: 3d_surface_plot.rb

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ruby-gnuplot 2.6.2-1
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require "gnuplot"

Gnuplot.open do |gp|
  Gnuplot::SPlot.new( gp ) do |plot|
    plot.grid

    plot.data = [
      Gnuplot::DataSet.new( "x**2+y**2" ) do |ds|
    	ds.with = "pm3d"
      end
    ]
  end
  sleep 10
end