Techniques for improving the performance of Java string encoding and decoding

Introduction: common string codes include LATIN1, UTF-8, UTF-16 and GB18030. They have their own characteristics, and the conversion between them is complex. This article will introduce the skills to improve the performance of Java string encoding and decoding. Author Wen Shaojin (high speed railway) Source: Alibaba developer official account ...

Posted by phil88 on Tue, 24 May 2022 14:50:50 +0300

Detailed inverse kinematics solution of omni-directional wheel and mcnamu wheel chassis (including motor output equation)

start The omni-directional mobile chassis of smart car commonly includes omni-directional wheel chassis and mcnamu wheel chassis (hereinafter referred to as mcnamu wheel chassis). The following content only includes these two chassis. Due to the special structure, the omni-directional wheel is divided into four wheels. First, we decompose the ...

Posted by tmswenson on Tue, 24 May 2022 14:46:44 +0300

Python learning notes class encapsulation & class inheritance & polymorphic inheritance & class methods and static methods & singleton design pattern

1, Class encapsulation: 1. Concept: Generalized encapsulation: the definition of functions and classes is the embodiment of encapsulation Encapsulation in a narrow sense: some attributes of a class do not want to be directly accessed by the outside world in the process of use. Instead, this attribute is private [only held by the current class], ...

Posted by loveccb on Tue, 24 May 2022 14:40:03 +0300

High performance web server -- nginx

1, Introduction 1. What is nginx? l is a high-performance http server, reverse proxy server and e-mail (IMAP/POP3) proxy server developed in c language. l is Igor Sysoev, a Russian programmer, and rambler, the second most visited in Russia Ru site development. 2. What are the advantages of nginx? l lightweight l when dealing with high concurren ...

Posted by guru2k9 on Tue, 24 May 2022 14:37:15 +0300

python class inheritance and composition

class inheritance The inheritance syntax is class derived class name (base class name): the base class name is written in parentheses, and the base class is specified in the tuple when the subclass is defined. That is, the parentheses in the definition of the subclass are a tuple, which is the class name of the base class. class A(): pass ...

Posted by nitromaster on Tue, 24 May 2022 14:25:07 +0300

Implementation principle of APNG playback on Web side

Source of drawings: https://commons.wikimedia.orgAuthor: Yang Caifang Write in front In the live broadcast development of cloud music, we often encounter the demand of animation playback. The application scenarios of each demand are different, and the smaller animation mostly adopts APNG format. If the animation is only displayed separately, y ...

Posted by Mathy on Tue, 24 May 2022 14:15:43 +0300

Object-oriented programming - encapsulation, decorator (property,classmethod,staticmethod)

1. Packaging 1. Encapsulation refers to the integration of data and functions 2. On the basis of encapsulation, I can hide the attributes installed in the object or class    Notice: (1) When defining a class or initializing an object, adding __ before an attribute will hide the attribute But the hidden start is just a kind of defor ...

Posted by lightkeepr on Tue, 24 May 2022 13:45:36 +0300

"Mathematical Modeling Algorithms and Applications Second Edition" - chapter12. Modern Optimization Algorithms

1. Simulated Annealing Algorithm 1.1 Introduction to the algorithm 1.2 Application example clc, clear sj0=load('sj.txt'); %Load the data of 100 targets, and save the data in a plain text file according to the position in the table sj.txt middle x=sj0(:,[1:2:8]);x=x(:); y=sj0(:,[2:2:8]);y=y(:); sj=[x y]; d1=[70,40]; sj=[d1;sj;d1]; sj=s ...

Posted by praeses on Tue, 24 May 2022 13:41:31 +0300

Mybatis Series Textbook - Basic - many to one

Step 1: run first, see the effect, and then learn Step 2: imitation and troubleshooting Step 3: many to one relationship Step 4: see the effect before learning Step 5: modify product java Step 6: product xml Step 7: mybatis config xml Step 8: Test mybatis Step 9: runnable projects Step 10: Exercise - modify the many to one relationship ...

Posted by M. Abdel-Ghani on Tue, 24 May 2022 13:15:21 +0300

Core technology and algorithm of python natural language processing -- Chinese syntactic analysis based on PCFG

This chapter in this book is a little thin, but the author also explained that this book is an introductory practice book of NLP, and syntactic analysis belongs to a higher-level problem in NLP, so I didn't explain it in depth. I'm also an introductory NLP after learning this book. After learning this book, I will learn statistical natural lang ...

Posted by forcerecon on Tue, 24 May 2022 12:42:37 +0300