ayucat/o2d.rb

## o2d.rb
#!/usr/bin/env ruby

# calc distances!

# example:
# %w[111 200 311 222 400].map { |s| printf "%s => %5.3f " s, o2d(s) }

def o2d(s)
  return 0.0 unless s.is_a?(String) && s.size == 3
  1 / (((0..2).to_a.inject(0) { |x, i| x += s[i,1].to_f**2 }) ** 0.5)
end
	#!/usr/bin/env ruby

	# calc distances!

	# example:
	# %w[111 200 311 222 400].map { \|s\| printf "%s => %5.3f " s, o2d(s) }

	def o2d(s)
	return 0.0 unless s.is_a?(String) && s.size == 3
	1 / (((0..2).to_a.inject(0) { \|x, i\| x += s[i,1].to_f2 }) 0.5)
	end