Python 中的 sympy . stats . negative emulatinornial()函数
原文:https://www . geeksforgeeks . org/sympy-stats-negative emuletinorial-function-in-python/
借助方法，我们可以创建一个具有负多项式分布的离散随机变量。
**Syntax:** sympy.stats.NegativeMultinomial(syms, k, p)
**Parameters:**
**syms:** the symbol
**k:** number of failures before the experiment is stopped, a positive integer
**p:** event probabilites, p>= 0 and p<= 1
**Returns:** a discrete random variable with Negative Multinomial Distribution.
例 1 :
Python 3
# import sympy, NegativeMultinomia, density, symbols
from sympy.stats import density
from sympy.stats.joint_rv_types import NegativeMultinomial
from sympy import symbols, pprint
p1, p2, p3 = symbols('p1, p2, p3', positive = True)
x1, x2, x3 = symbols('x1, x2, x3', nonnegative = True, integer = True)
# using sympy.stats.NegativeMultinomial() method
N = NegativeMultinomial('N', 3, p1, p2, p3)
negMulti = density(N)(x1, x2, x3)
pprint(negMulti)
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