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Takes a LabNation export, and finds transitions. The file can be loaded in D3, for visualization
#!/usr/bin/env ruby -w
require 'csv'
file = ARGV[0]
out = file.split('.').join('-compressed.')
unless file
puts "Usage: compress [filename]"
exit(-1)
end
CSV.open(out, 'w') do |csv|
index = 0
sample_period = 0
last = 0
high = 12
low = 0
threshold = (high - low) / 2
CSV.foreach(file, headers: true) do |line|
val = line['ChannelA_Acq00000'].to_f > threshold ? high : low
if index == 0
sample_period = line['SamplePeriodInSeconds']
csv << [ 0, val ]
last = val
elsif val != last
ts = sample_period * index
csv << [ ts, last ]
csv << [ ts, val ]
last = val
end
index += 1
end
end
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