Module: Kstats::Node::Helper

Defined in:
lib/kstats/node/helper.rb

Class Method Summary collapse

Class Method Details

.generate_array(data, start, period, nb_points) ⇒ Object

Entry: Data from probe with:

0: Date of the pick
1: Value of the pick

Output:

An array with value of average of each points



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# File 'lib/kstats/node/helper.rb', line 10

def self.generate_array data, start, period, nb_points
  out_array = Array.new nb_points

  for i in 0...nb_points
    out_array[i] = [0.0, 0.0] # value and coef.
  end

  data.each do |x|
    #Position of the data over the period:
    poz = (x[0] - start)/60 # In minutes
    poz = poz / period.to_f # In percent between [0..1]

    next if poz < 0.0 || poz > 1.0

    p1,p2,f = (poz * nb_points).floor, (poz*nb_points).ceil, (poz*nb_points).abs.modulo(1)

    if f>0.5
      output = out_array[p1]
    else
      output = out_array[p2]
    end

    unless output.nil?
      output[0] = (x[1] + output[1]*output[0]) / ( output[1] + 1)
      output[1] += 1
    end
  end

  out_array.map{ |x| x[0].round(3) }
end