Module: DF::Saving

Included in:
DataFrame
Defined in:
lib/data_frame/core/saving.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#save(filename, opts = {}) ⇒ Object

Saves a data frame as CSV.

Examples: df.save(‘/tmp/some_filename.csv’) df.save(‘/tmp/some_filename.csv’, :include_header => false) # No header information is saved df.save(‘/tmp/some_filename.csv’, :only => [:list, :of, :columns]) df.save(‘/tmp/some_filename.csv’, :subset => [:list, :of, :columns]) df.save(‘/tmp/some_filename.csv’, 

:filter => {:column_name => :category_value, 
  :another_column_name => (range..values)}) # Filter by category



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# File 'lib/data_frame/core/saving.rb', line 13

def save(filename, opts={})

  df = self
  df = df.subset_from_columns(*Array(opts[:only])) if opts[:only]
  df = df.subset_from_columns(*Array(opts[:subset])) if opts[:subset]
  df = df.filter_by_category(opts[:filter]) if opts[:filter]
  df = df.filter_by_category(opts[:filter_by_category]) if opts[:filter_by_category]

  File.open(filename, "w") { |f| f.write df.to_csv(opts.fetch(:include_header, true)) }
end