Class: Scaler

Inherits:
Object
  • Object
show all
Defined in:
lib/datafarming/scale_design.rb

Overview

A Scaler object will rescale a design from standard range [-1, 1] to a range specified by min & max, with the desired number of decimals

Instance Method Summary collapse

Constructor Details

#initialize(min: -1,, max: 1, decimals: nil) ⇒ Scaler

Returns a new instance of Scaler.



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# File 'lib/datafarming/scale_design.rb', line 6

def initialize(min: -1, max: 1, decimals: nil)
  unless decimals.nil? || ((decimals >= 0) && (decimals == decimals.to_i))
    fail "Invalid decimals argument: #{decimals}. Must be a non-negative integer"
  end
  @range = (max - min).to_r / 2
  @mid = min + @range
  @scale_factor = (decimals.nil? || decimals.zero?) ? decimals : 10r**decimals
end

Instance Method Details

#scale(value) ⇒ Object 



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# File 'lib/datafarming/scale_design.rb', line 15

def scale(value)
  new_value = @mid + @range * value
  if @scale_factor.nil?
    if new_value.to_r.denominator == 1
      new_value.to_i
    else
      new_value.to_f
    end
  elsif @scale_factor.zero?
    new_value.round
  else
    ((@scale_factor * new_value).round / @scale_factor).to_f
  end
end