#!/usr/bin/ruby

=begin
単純な入力信号を作る、フォーマットは070423/log_F_CSV.cppに準拠
=end

$stderr.puts "Usage #{__FILE__} [length = 512, mode = sin, option = (period = 1) ...]"

DELTA_T = 0.02 # 50Hz

length = (ARGV.shift || 512).to_i
mode = ARGV.shift || 'sin'

time_data = []

case mode
when "sin"
  time = 0.0
  period = (ARGV.shift || 1.0).to_f # 1Hz
  length.times{|i|
    time_data << [time, Math::sin(Math::PI * 2 * time / period)]
    time += DELTA_T
  }  
end

time_data.each_with_index{|item, i|
  puts [i, *item].join(',')
}