Class: DataFrame

Inherits:
Object
  • Object
show all
Extended by:
DF::Import::ClassMethods
Includes:
DF::ARFF, DF::ColumnManagement, DF::Filter, DF::ID3, DF::Import::InstanceMethods, DF::KMeans, DF::MLP, DF::PreProcess, DF::SBN, DF::Saving, Training
Defined in:
lib/data_frame/model.rb,
lib/data_frame/id3.rb,
lib/data_frame/mlp.rb,
lib/data_frame/sbn.rb,
lib/data_frame/arff.rb,
lib/data_frame/kmeans.rb,
lib/data_frame/data_frame.rb,
lib/data_frame/core/filter.rb,
lib/data_frame/core/import.rb,
lib/data_frame/core/saving.rb,
lib/data_frame/core/training.rb,
lib/data_frame/core/pre_process.rb,
lib/data_frame/core/column_management.rb

Overview

This allows me to have named columns and optionally named rows in a data frame, to work calculations (usually on the columns), to transpose the matrix and store the transposed matrix until the object is tainted.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from DF::Import::ClassMethods

from_csv

Methods included from DF::ColumnManagement

#append!, #drop!, #drop_one!, #move_to_last!, #rename!, #replace!, #replace_column!, #subset_from_columns

Methods included from DF::PreProcess

#j_binary_ize!, #numericize!

Methods included from Training

#training_set

Methods included from DF::Saving

#save

Methods included from DF::Import::InstanceMethods

#add_item, #import

Methods included from DF::Filter

#filter, #filter!, #filter_by_category, #filter_by_category!

Methods included from DF::ARFF

#to_arff, #to_csv

Methods included from DF::ID3

#create_id3, #id3

Constructor Details

#initialize(*labels) ⇒ DataFrame

Returns a new instance of DataFrame.



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# File 'lib/data_frame/data_frame.rb', line 21

def initialize(*labels)
  labels = labels.first if labels.size == 1 and labels.first.is_a?(Array)
  @labels = labels.map {|e| e.to_underscore_sym }
  @items = TransposableArray.new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object 



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# File 'lib/data_frame/data_frame.rb', line 70

def method_missing(sym, *args, &block)
  if self.labels.include?(sym)
    render_column(sym)
  elsif self.row_labels.include?(sym)
    render_row(sym)
  elsif @items.respond_to?(sym)
    @items.send(sym, *args, &block)
  else
    super
  end
end

Instance Attribute Details

#items ⇒ Object (readonly) Also known as: rows

The items stored in the frame



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# File 'lib/data_frame/data_frame.rb', line 16

def items
  @items
end

#labels ⇒ Object (readonly) Also known as: variables

The labels of the data items



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# File 'lib/data_frame/data_frame.rb', line 12

def labels
  @labels
end

#name ⇒ Object

An optional name, useful for arff files



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# File 'lib/data_frame/data_frame.rb', line 19

def name
  @name
end

Instance Method Details

#columns(reset = false) ⇒ Object Also known as: to_hash, to_dictionary

The columns as a Dictionary or Hash This is cached, call columns(true) to reset the cache.



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# File 'lib/data_frame/data_frame.rb', line 54

def columns(reset=false)
  @columns = nil if reset
  return @columns if @columns
  
  container = defined?(Dictionary) ? Dictionary.new : Hash.new
  i = 0
  
  @columns = @items.transpose.inject(container) do |cont, col|
    cont[@labels[i]] = col
    i += 1
    cont
  end
end

#inspect ⇒ Object 



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# File 'lib/data_frame/data_frame.rb', line 7

def inspect
  "DataFrame rows: #{self.rows.size} labels: #{self.labels.inspect}"
end

#model(name = nil, &block) ⇒ Object

Returns a model if defined Defines a model with a block, if given and not defined Stores the model in the models container, which gives us access like: df.models.new_model_name…



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# File 'lib/data_frame/model.rb', line 8

def model(name=nil, &block)
  return self.models[name] if self.models.table.keys.include?(name)
  return false unless block
  @pc = ParameterCapture.new(&block)
  model = self.filter(Hash) do |row|
    @pc.filter(row)
  end
  self.models.table[name] = model
end

#models ⇒ Object 



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# File 'lib/data_frame/model.rb', line 18

def models
  @models ||= OpenStruct.new
end

#render_column(sym) ⇒ Object

Return the column, given its name



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# File 'lib/data_frame/data_frame.rb', line 46

def render_column(sym)
  i = @labels.index(sym.to_underscore_sym)
  return nil unless i
  @items.transpose[i]
end

#render_row(sym) ⇒ Object 



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# File 'lib/data_frame/data_frame.rb', line 39

def render_row(sym)
  i = self.row_labels.index(sym)
  return nil unless i
  @items[i]
end

#row_labels ⇒ Object 



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# File 'lib/data_frame/data_frame.rb', line 27

def row_labels
  @row_labels ||= []
end

#row_labels=(ary) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/data_frame/data_frame.rb', line 31

def row_labels=(ary)
  raise ArgumentError, "Row labels must be an array" unless ary.is_a?(Array)
  @row_labels = ary
end