python scipy stats cdf beta pert计算返回nan

我正在用计算机计算beta pertscipy.stats.beta版.cdf但每当运行下面的代码时,它就会返回[nan nan nan]。我需要帮助计算beta pert。

import scipy
from scipy import stats
from scipy.stats import beta
import numpy as np
import random

random_values = np.random.randint(low=5000, high=625000, size=10)
print ('impart random' + ' ' + str(random_values) )

minimum = 5000
mode = 215000
maximum = 625000

d = (minimum + 4*mode + maximum)/6
print ("intermediate value"  + ' ' + str(d) )
alpha = 6*((d - minimum)/(maximum - minimum))
beta = 6*((maximum - d)/(maximum - minimum))

location = minimum
scale = maximum - minimum

pert = scipy.stats.beta.cdf(random_values, alpha, beta, location, scale)

print ('pert' + ' ' + str(pert))

谢谢你的帮助。