- 博客(21)
- 收藏
- 关注
RSS订阅原创 Scikit-Learn: Machine Learning in Python
Step1: 代码：from sklearn import datasetsx, y = datasets.make_classification(n_samples=1000, n_features=10, n_classes=2)print(x)print(y)结果：[[ 0.73344374 1.39021153 1.63908277 ... 0.53789494 -1.1279...
2018-06-19 13:39:33
847
原创 pandas
Part 1For each of the four datasets...Compute the mean and variance of both x and yCompute the correlation coefficient between x and yCompute the linear regression line: y=β0+β1x+ϵy=β0+β1x+ϵ (hint: us...
2018-06-08 17:37:52
240
原创 Scipy
Exercise 10.1: Least squaresimport numpy as npfrom scipy.optimize import leastsqA = np.random.randint(10, 20, (20, 10))A = np.mat(A)b = np.random.randint(10, 20, size=20)residuals = np.linalg.ls...
2018-05-31 17:23:09
214
原创 Matplotlib
Exercise 11.1: Plotting a functionimport matplotlib.pyplot as pltimport numpyx = numpy.linspace(0, 2, 10000)y = [(numpy.sin((i - 2) * numpy.exp(- i ** 2))) ** 2 for i in x]plt.plot(x, y)plt.titl...
2018-05-24 15:03:35
223
原创 Numpy Exercises
Exercise 9.1: Matrix operationsimport numpyfrom scipy.linalg import toeplitzA = []for i in range(0, 200): x = numpy.random.normal(size=500) A.append(x)A = numpy.array(A)B = toeplitz([i f...
2018-05-20 19:03:04
211
原创 LeetCode上的一道题
Triangle (#120)Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, given the following triangle[[2],[3,4],[6,5,7],[...
2018-05-16 19:07:47
159
原创 LeetCode上的一道题
1. House Robber II (#213)After robbing those houses on that street, thethief has found himself a new place for his thievery so that he will not gettoo much attention. This time, all houses at this p...
2018-05-02 22:04:55
319
原创 LeetCode上的一道题
283. 移动零给定一个数组 nums, 编写一个函数将所有 0 移动到它的末尾，同时保持非零元素的相对顺序。例如， 定义 nums = [0, 1, 0, 3, 12]，调用函数之后， nums 应为 [1, 3, 12, 0, 0]。注意事项:必须在原数组上操作，不要为一个新数组分配额外空间。尽量减少操作总数。算法描述：遍历列表删除列表中的0并计数，遍历完后在列表末尾加上0代码：class S...
2018-04-29 13:59:15
135
原创 leetcode上的两道题
58. 最后一个单词的长度给定一个仅包含大小写字母和空格 ' ' 的字符串，返回其最后一个单词的长度。如果不存在最后一个单词，请返回 0 。说明：一个单词是指由字母组成，但不包含任何空格的字符串。示例:输入: "Hello World"输出: 5算法描述：将输入的字符串依据空格切片，切片返回一个列表，若列表为空，则return 0，若不为空，则return列表最后一个元素的长度代码：class ...
2018-04-26 23:56:33
168
原创 第十一章
11-1import unittestdef city_function(city, country): return city.title() + ', ' + country.title()class city_country_test(unittest.TestCase): def test_city_country(self): formated ...
2018-04-10 00:13:01
140
原创 第十章
10-1with open('learning_python.txt') as file: print(file.read())with open('learning_python.txt') as file: for line in file: print(line.rstrip())with open('learning_python.txt') as ...
2018-04-06 16:03:43
203
原创 第九章
9-1：class Restaurant(): def __init__(self, restaurant_name, cuisine_type): self.restaurant_name = restaurant_name self.cuisine_type = cuisine_type def describe_restaurant(self...
2018-04-03 01:02:28
141
原创 第八章
8-1：def display_message(): print('我们正在学函数')display_message()8-2：def favorite_book(title): print('One of my favorite books is', title)favorite_book('Alice in Wonderland')8-3：def make_shirt(size, ...
2018-03-28 22:01:01
201
原创 第七章
7-1：car = input("Please input car: ")print("Let me see if I can find you a "+car)7-2：number = int(input('请输入用餐人数：'))if number > 8: print('抱歉没有空桌了')else: print('还有空桌')7-3：num = input('请输入一个数字：...
2018-03-26 09:07:18
181
原创 第六章
6-1：friend = {'first_name': 'YIngxue', 'last_name': 'Zheng', 'age': 20, 'city': 'Hefei'}print(friend)6-2：numbers = {'Alan': 1, 'Mary': 2, 'John': 3, 'James': 4, 'Jay': 5}print('Alan', numbers['Alan'])...
2018-03-21 20:30:54
119
原创 第五章
5-2:str1 = "wo hen kai xin"str2 = "wo bu kai xin"print(str != str2)test1 = "JaiR"test2 = "jair"print(test1.lower() == test2)num1 = 10000num2 = 1238522print(num1 == num2, num1 != num2, num1 > num2, ...
2018-03-20 22:45:58
208
原创 4-1 to 4-13
4-1pizzas = ['New York Style', 'Chicago Style', 'California Style']for pizza in pizzas: print(pizza) print("I like " + pizza + " pizza")print("I really love", pizzas[0], ',', pizzas[1], "and", p...
2018-03-14 23:35:58
232
原创 第三章作业
3-1:names = ['John', 'Bob', 'James', 'Alan']for name in names: print(name)3-2:names = ['John', 'Bob', 'James', 'Alan']for name in names: print(name + ", Good afternoon!")3-3:names = ['bike', 'mo...
2018-03-12 23:08:38
220
原创 习题2-1到2-11
2-1： simple_message.py :message = "hello world!"print(message)2-2: simple_messages.py :message = "hello world!"print(message)message = "I'm Jair Zhu."print(message)2-3: name_cases.py :name = ...
2018-03-07 23:00:22
332
原创 在python主页的一些发现和收获以及对未来的展望
发现和收获： 最近几天浏览了一下python主页，发现其对初学者十分友好，对python的介绍十分详细，并有相关教程。该教程可帮助我们快速入门。 和python相比，老牌语言C和C++有许多细节需要我们自己处理，在处理不当的情况下会产生程序崩溃和其他很难解决的问题。Java虽说解决了前者的许多缺点，但相比之下代码更加冗长，写起来也有许多限制。 python简洁的语法可以让...
2018-03-06 12:55:12
705
空空如也
空空如也
TA创建的收藏夹 TA关注的收藏夹
TA关注的人