今天寫畢業(yè)設(shè)計(jì)的時(shí)候遇到了一個(gè)級(jí)數(shù)展開式，里面包含著一個(gè)求一個(gè)數(shù)組的階乘運(yùn)算，這里特來記錄一下。

# -*- coding:utf-8 -*-'''author: 15025time: 2021/7/18 17:58software: PyCharmDescription: calculate factorial of a given number'''class PythonStudy: @staticmethod def factorial(n):num = 1for i in range(1, n + 1): num *= ireturn numif __name__ == '__main__': main = PythonStudy() result = main.factorial(4) print('The final result is: ') print(result)'''The final result is: 24'''

可以看到，我們正確地獲得了4的階乘值24。那么如果我們需要求一個(gè)數(shù)組中各個(gè)元素的階乘值呢？

# -*- coding:utf-8 -*-'''author: 15025time: 2021/7/18 17:58software: PyCharmDescription: calculate factorial of a given array'''import numpy as npclass 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] *= ireturn num_arrif __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]'''

這里我們可以看到我們成功獲得了數(shù)組[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]中對(duì)應(yīng)的的各個(gè)元素值的階乘值。

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