class Num:
def __init__(self, m=0):
self.n = 0
self.mu = 0
self.m2 = 0
self.sd = 0
self.lo = math.pow(10, 32)
self.hi = -1 * math.pow(10, 32)
self._some = Sample(m)
self.w = 1
def nums(self, t, f=None):
if f == None:
f = lambda x: x
n = Num(len(t))
for x in t:
n.numInc(f(x))
return n
def numInc(self, x):
if x == '?':
return x
self.n = self.n + 1
self._some.sampleInc(x)
d = x - self.mu
self.mu = self.mu + d / self.n
self.m2 = 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 = math.pow((self.m2 / (self.n - 1 + math.pow(10, -32))),
.5)
return x
def numDec(self, x):
if (x == "?"):
return x
if (self.n == 1):
return x
self.n = self.n - 1
d = x - self.mu
self.mu = self.mu - d / self.n
self.m2 = self.m2 - d * (x - self.mu)
if (self.n >= 2):
self.sd = math.pow(self.m2 / (self.n - 1 + math.pow(10, -32)), .5)
return x
def numNorm(self, x):
# what is this ???
return x == "?" and 0.5 or (x - self.lo) / (self.hi - self.lo +
math.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
