class Num:
def __init__(self, mx):
self.n = 0
self.mu = 0
self.m2 = 0
self.sd = 0
self.lo = pow(10, 32)
self.hi = pow(-10, 32)
self._some = Sample(mx)
self.w = 1
def Nums(t, f):
if f is None:
f = lambda x: x
n = Num(0)
for x in t:
n.NumInc(f(x))
return n
def NumInc(self, x):
if x == "?":
return x
self.n += 1
self._some.SampleInc(x)
d = x - self.mu
self.mu += d / self.n
self.m2 += d * (x - self.mu)
if x > self.hi:
self.hi = x
if x < self.lo:
self.lo = x
if self.n >= 2:
self.sd = pow(self.m2 / (self.n - 1 + pow(10, -32)), 0.5)
return x
def NumDec(self, x):
if x == "?":
return x
if (self.n == 1):
return x
self.n -= 1
d = x - self.mu
self.mu -= d / self.n
self.m2 -= d * (x - self.mu)
if self.n >= 2:
self.sd = pow(self.m2 / (self.n - 1 + pow(10, -32)), 0.5)
return x
def NumNorm(self, x):
return x == "?" and 0.5 or (x - self.lo) / (self.hi - self.lo +
pow(10, -32))
def NumXpect(self, j):
n = self.n + j.n + 0.0001
return self.n / n * self.sd + j.n / n * j.sd
