Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
def f2(n)
return n.odd? ? (n * 3 + 1) / 2 : n / 2
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
def d(s)
c = s.split('').select { |x| x == '1' }.size
d = c.to_f / s.length
return d
end
def len(ns, p)
l = ns.split(p)
l = [] if (l.nil?)
l.shift if (l[0] == '')
return l.map { |x| x.length }
end
def len01(ns)
return len(ns, /0+/), len(ns, /1+/)
end
def e(ns)
return len01(ns).flatten.size.to_f / ns.length
end
def avg(l)
l.inject { |t, x| t + x }.to_f / l.size
end
def seq(n)
l = [n]
while (n != 1)
n = f2(n)
l << n
end
return l
end
def fmt1(l, f)
w = l.max_by { |x| x.length }.length
f.puts("set colors classic; set ytics nomirror; set y2tics; set key top left opaque;\\")
f.puts("plot \\")
f.puts("[0:#{w}][0:#{l.size - 1}] '-' matrix using 2:1:3 with image title '', \\")
f.puts("'-' using (column('d')) with line axes x1y2 lw 3, \\")
f.puts("'-' using 1 with line title 'e' axes x1y2 lw 3")
l1 = []
l.each_with_index \
{
|z, i|
l1 << [d(z), e(z)]
c = w - z.length
z[z.length...w] = '0' * c
f.puts(z.split('').join(' '))
}
f.puts("eof")
f.puts("eof")
f.puts("d")
l1.each { |x| f.puts(x[0]) }
f.puts("eof")
l1.each { |x| f.puts(x[1]) }
f.puts("eof")
end
def grid(l)
f = File.open(fn = "gnuplot1.cmd", 'w')
f.puts("set palette negative grayscale; unset colorbox;")
fmt1(l.map { |x| x.to_s(2).reverse }, f)
f.close
end
n = terras121(dense(100, 0.05))
grid(seq(n))
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.