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今天写毕业设计的时候遇到了一个级数展开式，里面包含着一个求一个数组的阶乘运算，这里特来记录一下。
# -*- coding:utf-8 -*-
"""
author: 15025
time: 2021/7/18 17:58
software: PyCharm
Description:
calculate factorial of a given number
"""
class PythonStudy:
@staticmethod
def factorial(n):
num = 1
for i in range(1, n + 1):
num *= i
return num
if __name__ == "__main__":
main = PythonStudy()
result = main.factorial(4)
print("The final result is: ")
print(result)
"""
The final result is:
24
"""
可以看到，我们正确地获得了4的阶乘值24。那么如果我们需要求一个数组中各个元素的阶乘值呢？
# -*- coding:utf-8 -*-
"""
author: 15025
time: 2021/7/18 17:58
software: PyCharm
Description:
calculate factorial of a given array
"""
import numpy as np
class NumpyStudy:
@staticmethod
def factorial(arr):
length = len(arr)
num_arr = np.ones(length)
for index, value in enumerate(arr):
for i in range(1, value + 1):
num_arr[index] *= i
return num_arr
if __name__ == "__main__":
main = NumpyStudy()
array = np.arange(11)
result = main.factorial(array)
print("The final result is: ")
print(result)
"""
The final result is:
[1.0000e+00 1.0000e+00 2.0000e+00 6.0000e+00 2.4000e+01 1.2000e+02
7.2000e+02 5.0400e+03 4.0320e+04 3.6288e+05 3.6288e+06]
"""
这里我们可以看到我们成功获得了数组[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]中对应的的各个元素值的阶乘值。
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