Module: Rya::CoreExtensions::Math

Defined in:
lib/rya/core_extensions.rb

Instance Method Summary collapse

Instance Method Details

#scale(val, old_min, old_max, new_min, new_max) ⇒ Object 



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# File 'lib/rya/core_extensions.rb', line 23

def scale val, old_min, old_max, new_min, new_max
  # This can happen if you use the mean across non-zero samples.
  if old_max - old_min == 0
    # TODO better default value than this?
    (new_min + new_max) / 2;
  else
    ((((new_max - new_min) * (val - old_min)) / (old_max - old_min).to_f) + new_min)
  end

end