from /Users/elhu/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gnuplot-2.6.2/lib/gnuplot.rb:100:in `initialize'
from ./tmp/process_dataset.rb:52:in `new'
from ./tmp/process_dataset.rb:52:in `block in draw_plot'
from /Users/elhu/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gnuplot-2.6.2/lib/gnuplot.rb:76:in `block in open'
from /Users/elhu/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gnuplot-2.6.2/lib/gnuplot.rb:75:in `popen'
from /Users/elhu/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gnuplot-2.6.2/lib/gnuplot.rb:75:in `open'
No answers
