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Reference link Associative container While storing the element value, the associated container will be equipped with an additional value for each element (also known as "key", which is essentially an element of C + + basic data type or user-defined type). Its function is to find the target element directly through the key if the key ...

javaweb 1. Basic concepts 1.1 Preface web development: Meaning of web page www.bilibili.com com Static web html cssThe data provided to everyone will not change Dynamic web Everyone sees different information at different times and places Technology stack: servlet/jsp, ASP, PHP In java, the technology of dynamic web resource d ...

When teaching children to learn C + + language, in order to explain the encapsulation, inheritance and polymorphism of C + +, I wrote a simple main program framework class. The application only needs to derive subclasses from the main program framework class and implement its run(...) Method, and then define a subclass instance. The abstract c ...

Design Mode The role of design patterns Reuse design and codeIncrease scalabilityIncrease flexibilityImproving development efficiency Classification of design patterns Creative mode Patterns for object instantiation, Creative Patterns for decoupling instantiated objects of objects Structural pattern Combining classes or objects together t ...

1, Introduction 1 Overview BP (Back Propagation) neural network was proposed by the scientific research group headed by Rumelhart and McCelland in 1986. See their paper learning representations by Back Propagation errors published in Nature. BP neural network is a multilayer feedforward network trained by error back propagation algorithm. It ...

PHP string operation String is one of the important data types in PHP. In Web development, strings need to be processed and analyzed in many cases, which usually involves a series of operations, such as string formatting, string connection and segmentation, string comparison, search and so on. Therefore, it is very important for users to inter ...

Thread concept Concept of program, process and thread (1) is a set of instructions written in a certain language to complete a specific task. Refers to one Static code, static object. (2) it is an execution process of a program or a running program. Is a dynamic The process of: it has its own process of emergence, existence and extinction&mdas ...

modbus protocol uses [android serial communication] The purpose of this paper is to use modbus protocol for serial communication between android and host computer. Communicate with other devices through serial port to transfer data. It can be understood as the communication between computer and keyboard and mouse. I have uploaded the modbus pr ...

  due to the limited capability of JavaScript, the API s it provides only stay in the stand-alone stage. This will make some functions impossible to realize. For example, when the user logs in, the user will display the user's corresponding avatar when entering the user account; When the user registration cannot be realized, the user will ...

Part 27 shift inversion iteration to find the nearest eigenvalue and eigenvector Shift inverse iteration An eigenvalue method to realize vector iterative convergence more directly than the "maximum" eigenvalue method is Shift vector iteration method Rewrite to the following form Where p is a scalar "shift" value, [I] is t ...