qq_40927376的博客

3-1姓名：将一些朋友的姓名存储在一个列表中，并将其命名为names。依次访问该列表中的每个元素，从而将每个朋友的姓名都打印出来。3-2问候语：3-4 嘉宾名单：3-5 修改嘉宾名单：3-6 添加嘉宾3-9 晚餐嘉宾...

这道题要求使用最小二乘法找到这个x并且输出残差的范数，程序如下:import scipyfrom scipy import linalgfrom scipy.optimize import leastsqA = scipy.random.normal(size=[30, 20])b = scipy.random.normal(size=[30])def error(x, A, b)...

anscombe里有四个datasetpart1要求算出四个dataset的x、y均值、算出四个dataset的x、y的相关系数、实现线性回归import randomimport numpy as npimport scipy as spimport pandas as pdimport matplotlib.pyplot as pltimport seaborn as snsi...

import matplotlib.pyplot as pltfrom pylab import *import numpyfrom scipy.stats import gaussian_kde#exercise 1x = np.linspace(0, 2)y = np.power(np.sin(x-2), 2)*np.power(np.e, -x*x)plt.plot(x, y...

题目：There are two sorted arrays nums1 and nums2 of size m and n respectively.Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).Example 1:nums1 = [1, 3]nu...

先设置随机数种子：import numpy as npimport timeseed = np.int64(time.time())print(seed)np.random.seed(seed)Generate matrices A, with random Gaussian entries, B, a Toeplitz matrix, where A ∈Rn×m and B ∈Rm×m,...

题目：Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.Example:Input:[  1->4->5,  1->3->4,  2->6]Output: 1->1->2->3->4-&g...

813. Largest Sum of AveragesWe partition a row of numbers A into at most K adjacent (non-empty) groups, then our score is the sum of the average of each group. What is the largest score we can achieve...

In LOL world, there is a hero called Teemo and his attacking can make his enemy Ashe be in poisoned condition. Now, given the Teemo's attacking ascending time series towards Ashe and the poisoning tim...

10-1 Python学习笔记代码：filename = r'D:\homework.txt'with open(filename) as file_object: contents = file_object.read() print(contents)with open(filename) as file_object: for line in file_obj...

8-1 消息代码：def display_message():    print("I learn how to write a function")    def main():    display_message()    if __name__ == '__main__':    main()输出：8-2 喜欢的图书代码：def favorite_book(book_name):    p...

7.1 汽车租赁代码：car = input("Hello ,please tell which car you want to lease\n  car name:")print("Let me see if I can find you a " + car)输出（输入为Subarn）：7-2 餐馆订位代码：num = input("Hello ,please tell me how many ...

9-1 餐馆代码：class restaurant: def __init__(self, name, ctype): self.restaurant_name = name self.cuisine_type = ctype def discribe_restaurant(self): print("Restaurant ...

11-1 城市和国家：代码：homework.pydef city_fun(city, country): return city.title()+", "+countrytest_cities.pyimport unittestfrom homework import city_funclass CityTestCase(unittest.TestCase): def te...

6-1 人输出：6-2喜欢的数字：输出：6-10 喜欢的数字#2输出：

这个练习是让我们比较三种分类算法的性能，加上学习调试一些算法的参数。详情请看注释:代码中没有from sklearn import cross_validation，因为pycharm提示这个库在新版上sklearn已经被删掉了from sklearn import datasetsfrom sklearn.model_selection import KFoldfrom sklearn.na...