Method: Daru::DataFrame#initialize

Defined in:
lib/daru/dataframe.rb

#initialize(source, opts = {}) ⇒ DataFrame

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



242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
 
# File 'lib/daru/dataframe.rb', line 242

def initialize source, opts={} # rubocop:disable Metrics/MethodLength
  vectors, index = opts[:order], opts[:index] # FIXME: just keyword arges after Ruby 2.1
  @data = []
  @name = opts[:name]

  case source
  when ->(s) { s.empty? }
    @vectors = Index.coerce vectors
    @index   = Index.coerce index
    create_empty_vectors
  when Array
    initialize_from_array source, vectors, index, opts
  when Hash
    initialize_from_hash source, vectors, index, opts
  end

  set_size
  validate
  update
  self.plotting_library = Daru.plotting_library
end