Class: DaruLite::MultiIndex

Inherits:
Index show all
Defined in:
lib/daru_lite/index/multi_index.rb

Overview

rubocop:disable Metrics/ClassLength

Instance Attribute Summary collapse

Attributes inherited from Index

#relation_hash

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Index

__new__, #_dump, _load, coerce, inherited, #is_values, new, #slice, #sort, #subset_slice

Constructor Details

#initialize(opts = {}) ⇒ MultiIndex

names and levels should be of same size. If size of Array name is less or greater than size of array levels then it raises SizeError. If user don't want to put name for particular level then user must put empty string in that index of Array name. For example there is multi_index of 3 levels and user don't want to name level 0, then do multi_index.name = ['', 'level1_name1', 'level2_name']

Examples:


# set the name during initialization

mi = DaruLite::MultiIndex.new(
    levels: [[:a,:b,:c], [:one, :two]],
    labels: [[0,0,1,1,2,2], [0,1,0,1,0,1]], name: ['s1', 's2'])

# =>
# <DaruLite::MultiIndex(6x2)>
#   s1  s2
#    a one
#      two
#    b one
#      two
#    c one
#      two

# set new name

mi.name = ['k1', 'k2']
=> ["k1", "k2"]

mi
=>
#   #<DaruLite::MultiIndex(6x2)>
#   k1  k2
#    a one
#      two
#    b one
#      two
#    c one
#      two

# access the name

mi.name
=> ["k1", "k2"]

# If you don't want to name level 0

mi.name = ['', 'k2']
=> ["", "k2"]

mi
=>
#<DaruLite::MultiIndex(6x2)>
#       k2
#    a one
#      two
#    b one
#      two
#    c one
#      two

Raises:

  • (ArgumentError) 


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# File 'lib/daru_lite/index/multi_index.rb', line 79

def initialize(opts = {})
  labels = opts[:labels]
  levels = opts[:levels]

  raise ArgumentError, 'Must specify both labels and levels' unless labels && levels
  raise ArgumentError, 'Labels and levels should be same size' if labels.size != levels.size
  raise ArgumentError, 'Incorrect labels and levels' if incorrect_fields?(labels, levels)

  @labels = labels
  @levels = levels.map { |e| e.map.with_index.to_h }
  self.name = opts[:name] unless opts[:name].nil?
end

Instance Attribute Details

#labels ⇒ Object (readonly)

Returns the value of attribute labels.



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# File 'lib/daru_lite/index/multi_index.rb', line 11

def labels
  @labels
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/daru_lite/index/multi_index.rb', line 11

def name
  @name
end

Class Method Details

.from_arrays(arrays) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 105

def self.from_arrays(arrays)
  levels = arrays.map { |e| e.uniq.sort_by(&:to_s) }

  labels = arrays.each_with_index.map do |arry, level_index|
    level = levels[level_index]
    arry.map { |lvl| level.index(lvl) }
  end

  MultiIndex.new labels: labels, levels: levels
end

.from_tuples(tuples) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 116

def self.from_tuples(tuples)
  from_arrays tuples.transpose
end

.try_from_tuples(tuples) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 120

def self.try_from_tuples(tuples)
  from_tuples(tuples) if tuples.respond_to?(:first) && tuples.first.is_a?(Array)
end

Instance Method Details

#&(other) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 318

def &(other)
  MultiIndex.from_tuples(to_a & other.to_a)
end

#==(other) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 342

def ==(other)
  self.class == other.class  &&
    labels   == other.labels &&
    levels   == other.levels
end

#[](*key) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 124

def [](*key)
  if key.all? { |subkey| subkey.is_a?(Array) && subkey.length > 1 }
    retrieve_from_tuples(*key)
  else
    key.flatten!
    if key[0].is_a?(Range)
      retrieve_from_range(key[0])
    elsif key[0].is_a?(Integer) && key.size == 1
      try_retrieve_from_integer(key[0])
    else
      retrieve_from_tuple(key)
    end
  end
end

#add(*indexes) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 199

def add(*indexes)
  DaruLite::MultiIndex.from_tuples(to_a + [indexes])
end

#at(*positions) ⇒ object

Takes positional values and returns subset of the self capturing the indexes at mentioned positions

Examples:

idx = DaruLite::MultiIndex.from_tuples [[:a, :one], [:a, :two], [:b, :one], [:b, :two]]
idx.at 0, 1
# => #<DaruLite::MultiIndex(2x2)>
#   a one
#     two

Parameters:

  • positions (Array<Integer>) —

    positional values

Returns:

  • (object) —

    index object



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# File 'lib/daru_lite/index/multi_index.rb', line 189

def at(*positions)
  positions = preprocess_positions(*positions)
  validate_positions(*positions)
  if positions.is_a? Integer
    key(positions)
  else
    DaruLite::MultiIndex.from_tuples(positions.map { |v| key(v) })
  end
end

#coerce_index ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 269

def coerce_index
  if @levels.size == 1
    elements = to_a.flatten

    if elements.uniq.length == elements.length
      DaruLite::Index.new(elements)
    else
      DaruLite::CategoricalIndex.new(elements)
    end
  else
    self
  end
end

#conform(input_indexes) ⇒ Object

Provide a MultiIndex for sub vector produced

Parameters:

  • input_indexes (Array) —

    the input by user to index the vector

Returns:

  • (Object) —

    the MultiIndex object for sub vector produced



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# File 'lib/daru_lite/index/multi_index.rb', line 370

def conform(input_indexes)
  return self if input_indexes[0].is_a? Range

  drop_left_level input_indexes.size
end

#delete_at(position) ⇒ object

Takes a positional value and returns a new Index without the element at given position

Parameters:

  • position (Integer) —

    positional value

Returns:

  • (object) —

    index object



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# File 'lib/daru_lite/index/multi_index.rb', line 206

def delete_at(position)
  indexes = to_a
  indexes.delete_at(position)
  self.class.from_tuples(indexes)
end

#drop_left_level(by = 1) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 310

def drop_left_level(by = 1)
  MultiIndex.from_arrays to_a.transpose[by..]
end

#dup ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 306

def dup
  MultiIndex.new levels: levels.dup, labels: labels.dup, name: @name&.dup
end

#each ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 3

def each(&)
  to_a.each(&)
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/daru_lite/index/multi_index.rb', line 322

def empty?
  @labels.flatten.empty? && @levels.all?(&:empty?)
end

#include?(tuple) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/daru_lite/index/multi_index.rb', line 326

def include?(tuple)
  return false unless tuple.is_a? Enumerable

  @labels[0...tuple.flatten.size]
    .transpose
    .include?(tuple.flatten.each_with_index.map { |e, i| @levels[i][e] })
end

#inspect(threshold = 20) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 356

def inspect(threshold = 20)
  "#<DaruLite::MultiIndex(#{size}x#{width})>\n" +
    Formatters::Table.format([], headers: @name, row_headers: sparse_tuples, threshold: threshold)
end

#key(index) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/daru_lite/index/multi_index.rb', line 298

def key(index)
  raise ArgumentError, "Key #{index} is too large" if index >= @labels[0].size

  @labels
    .each_with_index
    .map { |label, i| @levels[i].keys[label[index]] }
end

#levels ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 13

def levels
  @levels.map(&:keys)
end

#map ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 7

def map(&)
  to_a.map(&)
end

#pos(*indexes) ⇒ Object

Note:

If the arugent is both a valid index and a valid position, it will treated as valid index

Returns positions given indexes or positions

Examples:

idx = DaruLite::MultiIndex.from_tuples [[:a, :one], [:a, :two], [:b, :one], [:b, :two]]
idx.pos :a
# => [0, 1]

Parameters:

  • indexes (Array<object>) —

    indexes or positions



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# File 'lib/daru_lite/index/multi_index.rb', line 155

def pos(*indexes)
  if indexes.first.is_a? Integer
    return indexes.first if indexes.size == 1

    return indexes
  end
  res = self[*indexes]
  return res if res.is_a? Integer

  res.map { |i| self[i] }
end

#remove_layer(layer_index) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 261

def remove_layer(layer_index)
  @levels.delete_at(layer_index)
  @labels.delete_at(layer_index)
  @name&.delete_at(layer_index)

  coerce_index
end

#reorder(new_order) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 212

def reorder(new_order)
  from = to_a
  MultiIndex.from_tuples(new_order.map { |i| from[i] })
end

#size ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 334

def size
  @labels[0].size
end

#sparse_tuples ⇒ Object

Return tuples with nils in place of repeating values, like this:

[:a , :bar, :one] [nil, nil , :two] [nil, :foo, :one]



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# File 'lib/daru_lite/index/multi_index.rb', line 382

def sparse_tuples
  tuples = to_a
  [tuples.first] + each_cons(2).map do |prev, cur|
    left = cur.zip(prev).drop_while { |c, p| c == p }
    Array.new(cur.size - left.size) + left.map(&:first)
  end
end

#subset(*indexes) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 167

def subset(*indexes)
  first_index = indexes.first
  if first_index.is_a? Integer
    MultiIndex.from_tuples(indexes.map { |index| key(index) })
  elsif first_index.is_a?(Array) && include?(first_index)
    # Same logic as in DaruLite::Index#subset
    MultiIndex.from_tuples indexes
  else
    self[indexes].conform indexes
  end
end

#to_a ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 348

def to_a
  (0...size).map { |e| key(e) }
end

#to_df ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 390

def to_df
  DaruLite::DataFrame.new(@name.zip(to_a.transpose).to_h)
end

#to_html ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 361

def to_html
  path = File.expand_path('../iruby/templates/multi_index.html.erb', __dir__)
  ERB.new(File.read(path).strip).result(binding)
end

#try_retrieve_from_integer(int) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 217

def try_retrieve_from_integer(int)
  @levels[0].key?(int) ? retrieve_from_tuple([int]) : int
end

#valid?(*indexes) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/daru_lite/index/multi_index.rb', line 139

def valid?(*indexes)
  # FIXME: This is perhaps not a good method
  pos(*indexes)
  true
rescue IndexError
  false
end

#values ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 352

def values
  Array.new(size) { |i| i }
end

#width ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 338

def width
  @levels.size
end

#|(other) ⇒ Object 



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# File 'lib/daru_lite/index/multi_index.rb', line 314

def |(other)
  MultiIndex.from_tuples(to_a | other.to_a)
end