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https://en.wikipedia.org/wiki/Trace_(linear_algebra) In linear algebra, the trace of an n-by-n square matrix A is defined to be the sum of the element
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posted @ 2017-09-03 21:05
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小结： 1、相似矩阵提出动机、诞生背景：化繁为简。 AB对B施加线性变换A，但A较复杂 》変基，变B所在空间的基 》化简了A https://en.wikipedia.org/wiki/Matrix_similarity Similarity is an equivalence relation o
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posted @ 2017-09-03 20:14
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抽象 现象本质 线性变换总是在各种基之间变来变去 可整相似矩阵的特征多项式相等，进而证明特征值相同
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posted @ 2017-09-03 19:23
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posted @ 2017-09-03 18:49
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小结： 代表不同基下的相同的操作 相似矩阵 https://en.wikipedia.org/wiki/Matrix_similarity Similarity is an equivalence relation on the space of square matrices. Because m
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posted @ 2017-09-03 18:42
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python D:\pymine\clean\spider_map\get_uidapi_res.py 120 160 python D:\pymine\clean\spider_map\get_uidapi_res.py 80 120 python D:\pymine\clean\spider_m
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posted @ 2017-09-03 17:12
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大陆27个省级行政区片区数据-基于58同城二手房数据 【数据来源】http://www.58.com城市清单http://www.58.com/changecity.html【结果汇总】数目省自治区份数、城市数、行政区县数、58片区数、数据总条数：27、483、3751、9723、12676行政区县
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posted @ 2017-09-03 01:02
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http://www.szzlb.gov.cn/LEAPV5/czww_webmap/czww_fwbmcx
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posted @ 2017-09-02 18:28
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import sys import os import requests import threading from time import sleep from bs4 import BeautifulSoup curPath = os.path.abspath(os.path.dirname(__file__)) rootPath = os.path.spl...
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posted @ 2017-09-01 20:20
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posted @ 2017-09-01 12:18
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https://www.fhwa.dot.gov/planning/tmip/transims/background.cfm?from=groupmessage
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posted @ 2017-08-30 23:07
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from openpyxl import Workbook import time import sys import os import pprint import re curPath = os.path.abspath(os.path.dirname(__file__)) rootPath = os.path.split(curPath)[0] sys.path.append...
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posted @ 2017-08-30 19:52
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算法要先解决老百姓的看得见的数学
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posted @ 2017-08-30 01:42
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python D:\pymine\clean\spider_map\get_bd_uid_rest_b.py python D:\pymine\clean\spider_map\get_bd_uid_rest.py python D:\pymine\clean\spider_map\get_bd_uid_28_other20_b.py #MAX_USED_TIMES = 1900 p...
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posted @ 2017-08-29 20:04
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import xlrd import time import sys import os import requests import sqlite3 import threading curPath = os.path.abspath(os.path.dirname(__file__)) rootPath = os.path.split(curPath)[0] sys.path....
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posted @ 2017-08-29 17:53
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SQLite objects created in a thread can only be used in that same thread.The object was created in thread id 62332 and this is thread id 53032 sqlite支持
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posted @ 2017-08-29 17:09
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06 | 链表（上）：如何实现LRU缓存淘汰算法?-极客时间 https://time.geekbang.org/column/article/41013 不过，数组和链表的对比，并不能局限于时间复杂度。而且，在实际的软件开发中，不能仅仅利用复杂度分析就决定使用哪个数据结构来存储数据。 数组简单易用
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posted @ 2017-08-29 12:49
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posted @ 2017-08-28 23:28
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posted @ 2017-08-28 22:18
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posted @ 2017-08-28 21:52
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posted @ 2017-08-28 17:53
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posted @ 2017-08-28 05:31
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posted @ 2017-08-28 05:28
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import matplotlib matplotlib.use('Agg') import numpy as np from numpy import array from matplotlib import pyplot from scipy import integrate import math import time from sys imp...
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posted @ 2017-08-28 03:43
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posted @ 2017-08-27 19:22
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posted @ 2017-08-27 17:28
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import sys import os curPath = os.path.abspath(os.path.dirname(__file__)) rootPath = os.path.split(curPath)[0] sys.path.append(rootPath) from selenium import webdriver from selenium.webdriver.chr...
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posted @ 2017-08-27 16:03
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206. 反转链表 - 力扣（LeetCode） https://leetcode-cn.com/problems/reverse-linked-list/ class Node: def __init__(self, val=None): self.val = val self.next = No
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posted @ 2017-08-27 13:11
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小结： 1、栈内存 为什么快？ Due to this nature, the process of storing and retrieving data from the stack is very fast as there is no lookup required, you just st
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posted @ 2017-08-26 19:53
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from openpyxl import Workbook import xlrd import time import Levenshtein as Le target_city_list = ['北京市', '上海市', '深圳市', '广州市'] source_name = 'JMTool任务_csv_py_wholeCSV-加百度170826165729' ...
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posted @ 2017-08-26 17:09
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time — Time access and conversions — Python 3.8.5 documentation https://docs.python.org/3/library/time.html#time.monotonic PEP 418 -- Add monotonic ti
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posted @ 2017-08-25 21:06
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pip install python-Levenshtein
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posted @ 2017-08-25 11:08
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posted @ 2017-08-25 08:50
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https://hacks.mozilla.org/2017/08/inside-a-super-fast-css-engine-quantum-css-aka-stylo/?utm_source=dev-newsletter&utm_medium=email&utm_campaign=aug24-
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posted @ 2017-08-24 23:41
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posted @ 2017-08-24 21:31
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from bs4 import BeautifulSoup import os filepath = 'D:\\pymine\\clean\\spider_map\\baidu_map_html_firstpage_pc_test\\' pathDir = os.listdir(filepath) name_poi_dic = {} need_todo_request = ['搜索结果'...
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posted @ 2017-08-24 21:08
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posted @ 2017-08-23 13:33
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posted @ 2017-08-19 16:29
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spider from mobile to mobile to mobile ua
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posted @ 2017-08-19 12:30
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import time from selenium import webdriver browser = webdriver.Chrome() wait_time = 1 USER = 'xl.feng' PWD = 'fengxiaole' seed_url = 'http://xx.com/login.jhtml' browser.get(seed_url) # time.sleep...
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posted @ 2017-08-16 19:36
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