require 'daru'

a = Daru::Vector.new([1,2,3,4,5], index: [:a, :b, :c, :d, :e], name: :bazinga)

a[:b]

a[:b..:d]

a[:b] = 999
a

a = Daru::Vector.new([1,2,3,5,5,4,6,nil,nil], missing_values: [5,nil])
a.only_valid

b = Daru::Vector[1,2,3,4,6..10]

a = Daru::Vector.new_with_size(1000, name: :new_vector) { r=rand(5); r == 4 ? nil: r; }

a.head

a = Daru::Vector.new([23,144,332,11,2,5,6765,3])

a.sort

a = Daru::Vector.new([1,2,3,4,5,6], index: [:a, :b, :c, :d, :five, :f])
b = Daru::Vector.new([1,2,3,4,5], index: [:a, :b, :c, :ff,:five])

a + b

a ** b

a * 5

v = Daru::Vector.new([1,2,3,4,5,nil,6,nil,7])
v.mean

v.variance

v.median

v = Daru::Vector.new((0..360).step(7).map { |i| Math.sin((i*Math::PI)/180) })
v.plot

v = Daru::Vector.new([40,50,20,70,10], index: ['18-24', '24-30', 'Under 18', '30-40', '40-50'], name: "Age Range")
v.plot(type: :bar) do |plt|
  plt.x_label "Age Groups"
  plt.y_label "Number of People Surveyed"
end

require 'statsample'
include Statsample::Shorthand

a = rnorm(1000)
a.plot type: :histogram do |p|
  p.yrange [0,200]
  p.y_label "Frequency"
  p.x_label "Bins"
end