require 'daru'

df = Daru::DataFrame.from_csv '/home/sameer/github_repos/daru/spec/fixtures/music_data.tsv', col_sep: "\t"

df.timestamp.map! { |ts| ts += "+5:30"}

require 'date'
df = df.map_rows do |row|
  row[:timestamp] = DateTime.strptime(row[:timestamp], '%Y-%m-%dT%H:%M:%SZ%z').to_time
  row
end

# Group by artist name and call 'size' to see the number of rows each artist populates.
artists = df.group_by(:artname).size

artists.max_index

top_ten = artists.sort(ascending: false)[0..10]

top_ten.plot type: :bar do |plt| 
  plt.width 1120 
  plt.height 500
  plt.legend true
  plt.rotate_x_label 20
end