Created
April 15, 2016 00:35
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def prime(n) | |
return true if (n == 2) | |
return false if (n.even?) | |
f = 3 | |
while (f < n / 2) | |
$f << f | |
return false if (n % f == 0) | |
f += 2 | |
end | |
return true | |
end | |
def seq1(w) | |
$f = [] | |
l = [] | |
t = 0 | |
n = 3 | |
j = 0 | |
while (l.size < $c) | |
if prime(n) then | |
j += 1 | |
if (j % w == 0) then | |
l << $f.size | |
$f.clear | |
end | |
end | |
n += 2 | |
end | |
return l | |
end | |
def f(n) | |
c = 0 | |
while (n != 1) | |
n = (3 * n + 1) if (n.odd?) | |
# n = (3 * n + 1) / 2 while (n.odd?) | |
n = n / 2 if (n.even?) | |
# n /= 2 while (n.even?) | |
c += 1 | |
end | |
return c | |
end | |
def stat(l) | |
return 0, 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) | |
raise if (sd.nan?) | |
return a, sd | |
end | |
def seq2(w) | |
n = 3 | |
t = 0 | |
l = [] | |
l2 = [] | |
c = 0 | |
while (l2.size < $c) | |
l << f(n) | |
n += 2 | |
if (l.size == w) then | |
a, sd = stat(l) | |
l2 << a | |
l.clear | |
c += 1 | |
end | |
end | |
return l2 | |
end | |
$c = 500 | |
l = [] | |
(1..7).each { |w| l << seq2(w * 500) } | |
i = 0 | |
l.each_with_index { |l1, c| l1.each { |x| puts([i, x, c].join("\t")); i += 1 }; puts } |
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