Class: Rserve::DataFrame

Inherits:
Object
  • Object
show all
Defined in:
lib/rserve/data_frame.rb

Overview

An R-centric container for storing data frame-ish data

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ordered_hash, rownames = nil) ⇒ DataFrame

takes an ordered hash, where the col_name is the key and the data rows are an array of values. The default ordering of the hash keys will be used as the colnames. This works great for ruby 1.9 (which remembers ordering). Use an OrderedHash for ruby 1.8. The rownames can be used to specify the names of the rows (remains nil if no values specified)



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# File 'lib/rserve/data_frame.rb', line 40

def initialize(ordered_hash, rownames=nil)
  @data = ordered_hash
  @rownames = rownames
end

Instance Attribute Details

#colnames ⇒ Object

will use colnames if they’ve been set, otherwise data.keys



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

def colnames
  @colnames || @data.keys 
end

#data ⇒ Object

a hash where the keys are the column names and the values are arrays of data



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

def data
  @data
end

#rownames ⇒ Object

rownames as an array of Integers or Strings. nil by default.



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# File 'lib/rserve/data_frame.rb', line 9

def rownames
  @rownames
end

Class Method Details

.from_structs(array) ⇒ Object

takes an array of structs and returns a data frame object



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# File 'lib/rserve/data_frame.rb', line 15

def self.from_structs(array)
  names = array.first.members
  lengthwise_arrays = names.map { Array.new(array.length) }
  array.each_with_index do |struct,m|
    struct.values.each_with_index do |val,n|
      lengthwise_arrays[n][m] = val
    end
  end
  data = {}
  names.zip(lengthwise_arrays) do |name, lengthwise_array|
    data[name] = lengthwise_array
  end
  self.new(data)
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/rserve/data_frame.rb', line 45

def ==(other)
  (self.data == other.data) && (self.rownames == other.rownames)
end