SciRuby/gnuplotrb

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examples/plot_in_polar/plot.rb

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require 'gnuplotrb'
include GnuplotRB

plot = Plot.new(['abs(sin(3*t))', with: 'filledcurves'], title: 'Plot in polar example', polar: true, samples: 1000)

plot.to_png('./gnuplot_gem.png', size: [600, 600])