Example of reading and writing a CSV file

csv_example.rb

# suitable for small files only
require 'csv'

f='a.csv'
headers=['x','y']

csv=[]
if File.exists?(f)
  CSV.foreach(f, {:headers => :first_row, :converters => [:numeric]}) do |row|

		csv << row
	end
end

csv << [rand(),rand()]

CSV.open(f, 'w') do |out|
	out << headers
	csv.each{|row| out << row}
end