Module: Bullshit::ModuleFunctions

Included in:
Case::CaseExtension, Case::CaseExtension::TruncateData
Defined in:
lib/bullshit.rb

Class Method Summary collapse

Class Method Details

.angle(degree) ⇒ Object

Return the angle degree in radians.



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# File 'lib/bullshit.rb', line 22

def angle(degree)
  Math.tan(Math::PI * degree / 180)
end

.array_window(array, window_size) ⇒ Object

Let a window of size window_size slide over the array array and yield to the window array.



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# File 'lib/bullshit.rb', line 33

def array_window(array, window_size)
  window_size < 1 and raise ArgumentError, "window_size = #{window_size} < 1"
  window_size = window_size.to_i
  window_size += 1 if window_size % 2 == 0
  radius = window_size / 2
  array.each_index do |i|
    ws = window_size
    from = i - radius
    negative_from = false
    if from < 0
      negative_from = true
      ws += from
      from = 0
    end
    a = array[from, ws]
    if (diff = window_size - a.size) > 0
      mean = a.inject(0.0) { |s, x| s + x } / a.size
      a = if negative_from
        [ mean ] * diff + a
      else
        a + [ mean ] * diff
      end
    end
    yield a
  end
  nil
end

.percent(number) ⇒ Object

Return the percentage number as a value in the range 0..1.



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# File 'lib/bullshit.rb', line 27

def percent(number)
  number / 100.0
end