File: noise.rb

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# Small script for generating sine and cosine:
# use it this way:
# ruby trig.rb > trig.dat

include Math                    # can come in useful

100.times do |i|
  x = (-1.5 * PI + i * 1.5 * PI / 49.5).to_f
  alea = rand - 0.5
  alea2= rand - 0.5
  signum = (alea>0)?-1:1
  puts "#{signum*x+alea2}\t#{cos(signum*x)}\t#{cos(signum*x+alea2)}"
end