Created
February 3, 2019 22:59
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def f2(n) | |
return n.odd? ? (n * 3 + 1) / 2 : n / 2 | |
end | |
def re(n, t) | |
s = (n % 2).to_s | |
n1 = n | |
l = [n] | |
t.times \ | |
{ | |
n = f2(n) | |
l << n | |
s << (n % 2).to_s | |
break if (n == 1) | |
} | |
return l, s, n | |
end | |
def adj(x, m, n, s2, p2, p, x3) | |
s2.replace(p[0...x] + (x3 % 2).to_s) | |
m = (s2[x, 1] == p[x, 1]) | |
n = p2.reverse.to_i(2) | |
p2[x, 1] = m ? '11' : '01' | |
return m, n, x3 | |
end | |
def terras121(p) | |
p2 = ['01', '11'][p[0, 1].to_i] | |
n = 1 | |
n3 = 0 | |
m = p2 == '11' | |
x3 = (p2.reverse.to_i(2)) >> 1 | |
(1...p.length).each \ | |
{ | |
|x| | |
if (!m) | |
ns = n.to_s(2) | |
ns[0, 1] = '' | |
m1 = x3 - 3**n3 | |
n1 = f2(m1) | |
end | |
n3 = p[0...x].split('').select { |z| z == '1' }.size | |
s2 = '' | |
m, n, x3 = adj(x, m, n, s2, p2, p, m ? (f2(x3) + 3**n3) : (n1 + 3**n3)) | |
} | |
n = p2.reverse.to_i(2) | |
return n | |
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) | |
end | |
c2 = Math.log(2) | |
c3 = Math.log(3) | |
ns = '' | |
x = 1 | |
m = 0 | |
l1 = [] | |
c = 50 | |
c.times \ | |
{ | |
l1 << Math.log(x) | |
if (m > c2) | |
m -= c2 | |
ns << '0' | |
x /= 2.0 | |
else | |
m += c3 - c2 | |
ns << '1' | |
x *= 3.0 / 2 | |
end | |
} | |
n = terras121(ns) | |
l, = re(n, ns.length - 1) | |
puts(['y1', 'y2', 'd', 'y2w'].join("\t")) | |
c.times \ | |
{ | |
|x| | |
y1 = l1[x] - l1[0] | |
y2 = Math.log(l[x]) - Math.log(l[0]) | |
puts([y1, y2, y1 - y2, l[x].to_s(2).length].join("\t")) | |
} |
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