require 'daru'

idx = Daru::CategoricalIndex.new [:a, 1, :a, 1, :c]

dv = Daru::Vector.new 'a'..'e', index: idx

dv[:a]

dv[:a, 1]

dv.at 1

dv.at 0, 1, 2

dv[3]

dv[0, 3]

dv[:a] = 20
dv

dv.at_set [0, 1], 100
dv

idx = Daru::Index.new [:a, :b, :c, :d]

dv = Daru::Vector.new 1..4, index: idx

dv[:a, :b]

dv.at 0, 1

dv[:a, :b] = 'x'
dv

dv.at_set [0, 2], 'y'
dv

idx = Daru::MultiIndex.from_tuples [
          [:a,:one,:bar],
          [:a,:one,:baz],
          [:a,:two,:bat],
          [:b,:one,:bar],
          [:b,:two,:baz],
        ]

dv = Daru::Vector.new 1..5, index: idx

dv[:a]

dv[:a, :one, :bar]

dv.at 0, 1, 2

dv[:a, :one] = 'x'
dv

dv.at_set [0, 1, 2], 'z'
dv