pattern.rb

def f2(n)
	return n.odd? ? (n * 3 + 1) / 2 : n / 2

end

def dense(w, d)
	w2 = w - 1
	
	a = (0...w2).to_a
	s = '0' * w2
	(1..(d * w - 1)).map { a.delete_at(rand(a.size)) }.each { |x| s[x, 1] = '1' }
	return ('1' + s).to_i(2) 
	
end

def stat(l)
	l = [0] if (l.empty?)
        t = t2 = 0
        l.each \
        {
		|x|
		t += x
		t2 += x ** 2
        }
        c = l.size
        a = t.to_f / c
        z = t2.to_f / c - a ** 2
        sd = Math.sqrt(z < 0 ? 0 : z)

	return a, sd, l.max.to_f, l.min.to_f
end

def stat2(l, t, n)
	return Hash[[["a#{n}", "sd#{n}", "mx#{n}"], stat(l)[0..2].map { |x| x / t }].transpose]
end

def d(s)
        c = s.split('').select { |x| x == '1' }.size
	d = c.to_f / s.length
        return d
        
end

def data(n)
	ns = n.to_s(2)
	nl = ns.length
	m = nl / 2
	
	nsh = ns[0..m]
	nsl = ns[m..-1]
	
	asdm1 = stat2(ns.split(/0+/).map { |x| x.length }, nl, 1)
	
	l1 = ns.split(/1+/)
	
	l1.shift
	asdm0 = stat2(l1.map { |x| x.length }, nl, 0)
	
	return {'n' => n, 'ns' => ns, 'nl' => nl, 'd' => d(ns), 'dh' => d(nsh), 'dl' => d(nsl)}.merge(asdm1).merge(asdm0)
end

def count(n)
	
	c = 0
	n1 = n
	l = [n]
	begin
		n = f2(n) 
		l << n
		c += 1
	end while n >= n1
	return {'c' => c, 'l' => l}
end

def dist(c)
		
	return (0...c).map { |i| count(dense(200, i.to_f / (c - 1))) }

end

def out(fn, a)
	
	f = File.open(fn, 'a')
	f.puts(a.keys.join("\t")) if (f.size == 0)
	f.puts(a.values.join("\t"))
	f.close
end


l = dist(500)
l.sort_by! { |x| -x['c'] }

File.open(fn = 'out.txt', 'w').close

l[0..20].each_with_index \
{
	|x1, i|
	x1['l'].each_with_index \
	{
		|x, j|
		out(fn, data(x).merge({'i' => i, 'j' => j}))
	}
	out(fn, {})
}

f = File.open('gnuplot.cmd', 'w')
['nl', 'a1', 'sd1', 'mx1'].each \
{
	|x|
	f.puts("plot '#{fn}' using (column('j')):(log(column('#{x}'))):(column('i')) with line linecolor palette title 'log #{x}'")
	f.puts("pause -1")
}
f.close