摘要：用python算方差可以借助numpy的向量运算来求更快速：import numpynarray=numpy array(nlist)sum1=narray sum()narray2=narray*narraysum2=narray2 sum()mean=sum1 Nvar=sum2 N-mean**2...

用python算方差可以借助numpy的向量运算来求更快速：

import numpy

narray=numpy.array(nlist)

sum1=narray.sum()

narray2=narray*narray

sum2=narray2.sum()

mean=sum1/N

var=sum2/N-mean**2