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Python 中的 sympy.stats.negative emulatinornial()函数

原文:https://www.geeksforgeeks.orgpy-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 :

蟒 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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