daru

Daru::DataFrame#initialize

DataFrame basically consists of an Array of Vector objects.
These objects are indexed by row and column by vectors and index Index objects.

== Arguments

* source - Source from the DataFrame is to be initialized. Can be a Hash
of names and vectors (array or Daru::Vector), an array of arrays or
array of Daru::Vectors.

== Options

+:order+ - An *Array*/*Daru::Index*/*Daru::MultiIndex* containing the order in
which Vectors should appear in the DataFrame.

+:index+ - An *Array*/*Daru::Index*/*Daru::MultiIndex* containing the order
in which rows of the DataFrame will be named.

+:name+  - A name for the DataFrame.

+:clone+ - Specify as *true* or *false*. When set to false, and Vector
objects are passed for the source, the Vector objects will not duplicated
when creating the DataFrame. Will have no effect if Array is passed in
the source, or if the passed Daru::Vectors have different indexes.
Default to *true*.

== Usage
  df = Daru::DataFrame.new({a: [1,2,3,4], b: [6,7,8,9]}, order: [:b, :a],
    index: [:a, :b, :c, :d], name: :spider_man)

  # =>
  # <Daru::DataFrame:80766980 @name = spider_man @size = 4>
  #             b          a
  #  a          6          1
  #  b          7          2
  #  c          8          3
  #  d          9          4

  df = Daru::DataFrame.new([[1,2,3,4],[6,7,8,9]], name: :bat_man)

  # =>
  # #<Daru::DataFrame: bat_man (4x2)>
  #             0          1
  #  0          1          6
  #  1          2          7
  #  2          3          8
  #  3          4          9

  # Dataframe having Index name

  df = Daru::DataFrame.new({a: [1,2,3,4], b: [6,7,8,9]}, order: [:b, :a],
    index: Daru::Index.new([:a, :b, :c, :d], name: 'idx_name'),
    name: :spider_man)

  # =>
  # <Daru::DataFrame:80766980 @name = spider_man @size = 4>
  # idx_name            b          a
  #        a          6          1
  #        b          7          2
  #        c          8          3
  #        d          9          4


  idx = Daru::Index.new [100, 99, 101, 1, 2], name: "s1"
  => #<Daru::Index(5): s1 {100, 99, 101, 1, 2}>

  df = Daru::DataFrame.new({b: [11,12,13,14,15], a: [1,2,3,4,5],
    c: [11,22,33,44,55]},
    order: [:a, :b, :c],
    index: idx)
   # =>
   #<Daru::DataFrame(5x3)>
   #   s1   a   b   c
   #  100   1  11  11
   #   99   2  12  22
   #  101   3  13  33
   #    1   4  14  44
   #    2   5  15  55

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