docker installation and common commands
Centos installation docker
Install dependent packages
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
Set alicloud image source
sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
Install docker CE
sudo yum install docker-ce
report errors
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Posted by csxpcm on Wed, 25 May 2022 16:53:53 +0300
Application of 3D Convex Hull Algorithm in PCL
Given n vertices in three-dimensional space, solve the convex hull surface formed by these n vertices.
Solving process:
First choose a tetrahedron (initial convex hull) formed by 4 points, and then add a new point P each time, in two cases:
1. If P is in the convex hull, it can be skipped
2. P is outside the convex hull. For a certain edge, fin ...
Posted by saiko on Wed, 25 May 2022 16:16:45 +0300
Conversion of word documents to PDF and various document formats
Conversion of word documents to PDF and various document formats
Project address: https://gitee.com/Jakewabc/word-of-pdf.git
Relevant cases:
https://github.com/aspose-words/Aspose.Words-for-Java.git
https://github.com/aspose-pdf/Aspose.PDF-for-Java.git
It's very slow on GitHub. It is recommended to create a project on gitee. Click create projec ...
Posted by NickTyson on Wed, 25 May 2022 16:14:20 +0300
How does the automated test parse the excel file?
foreword
In automated testing, we store data nothing more than using files or databases, so the files can be csv, xlsx, xml, or even txt files. Usually, excel files are often our first choice. Whether it is writing test cases or storing test data, excel is Very convenient. So today, we will summarize the methods of processing excel files in dif ...
Posted by raven_web on Wed, 25 May 2022 15:58:56 +0300
Basic concepts of thread
What is a process? What is a thread
Process: simple explanation, an application on the computer hard disk, such as QQ Exe, when it runs, is called a process.
Thread: the smallest execution unit in a process is called a thread.
Several ways of creating process
1. Inherit the Thread class and override the run() method
2. Implement the Runnable in ...
Posted by lill77 on Wed, 25 May 2022 15:54:58 +0300
Zero foundation introduction Python crawler web e-book batch crawling
Blessed are fiction fans. To learn this, you don't have to be harassed by web advertising, and you don't have to spend money on various novel platforms. Isn't it fragrant to crawl in batches by yourself?
It's also good news for friends who love learning. All kinds of data to crawl and save. It is more conducive to improve their learning ef ...
Posted by Moocat on Wed, 25 May 2022 15:53:29 +0300
libtorch study notes - MNIST combat
MNIST libtorch practical exercise
Ready to work
First download the MNIST database, http://yann.lecun.com/exdb/mnist/
After downloading, do not decompress it with software such as winrar. For example, t10k-images-idx3-ubyte is decompressed into t10k-images.idx3-ubyte. It is best to decompress it with tar in Linux environment.
Suppose you unzip t ...
Posted by chrys on Wed, 25 May 2022 15:51:55 +0300
In depth understanding of ArrayList and LinkedList, source code analysis and performance testing
Spoiler: ArrayList's insertion and query operations are much faster than LinkedList
ArrayList
characteristic
The bottom layer is realized by array, with fast query speed and slow addition, deletion and modification speed (in theory)
Thread unsafe
Common methods of ArrayList
import java.util.ArrayList;
import java.util.Iterator;
import jav ...
Posted by cyrixware on Wed, 25 May 2022 15:49:26 +0300
The use of formatter formatting dictionary display of el-table in EleemntUI
Scenes
Some properties are similar to those stored in dictionaries (key-value pairs), such as operators
1 represents the user id array The library also stores the user id, but the user name is displayed on the page
The czy stored in the database is a number that is the user's id
And to display on the page is the user's name
Note: ...
Posted by bbbaldie on Wed, 25 May 2022 15:47:49 +0300
Three ways to export Excel through NPOI in Winform (HSSFWorkbook, XSSFWorkbook, SXSSFWorkbook) with code download
Scenes
Difference between HSSFworkbook,XSSFworkbook,SXSSFworkbook
HSSFWorkbook:
It is the version before operating Excel 2003 (including 2003), and the extension is .xls; the most common way to export excel; but the limitation of this method is that the number of exported lines is at most 65535 lines, and the system will report an error when ...
Posted by Option on Wed, 25 May 2022 15:32:42 +0300