Use CatGPT to let the turtlesim little turtle draw curves
Note that this is CatGPT, which is not equivalent to OpenAI's ChatGPT, but it is very convenient to use and the effect is not bad.Explain in detail what needs to be paid attention to when drawing curves for ROS robot turtlesim ROS robot turtlesim needs to pay attention to the following points when drawing curves:
Before drawing the cu ...
Posted by blunt on Tue, 07 Mar 2023 16:47:22 +0300
Hash table basic algorithm
Hash table related algorithm basic questions
Hash Table Overview
Main content of this article
LeetCode242. Valid anagrams
Idea 1: Traversing the string uses the key value key of the hashmap to save the letters, and the value saves the number of occurrences of the key letters. For the second string, the key value is reduced by one, ...
Posted by gdure on Tue, 07 Mar 2023 16:11:29 +0300
Xiaoman reads the source code Finding the truth from the demo
Table of contents1. Overview of the core components of netty2. The birth of the channel started by the server3. The creation of NioServerSocketChannelFinally one day can not be SSM, CRUD, not boring and boring in business. Using netty to build the company's chat system, I'm a little excited to think about it. If you want to use netty, ...
Posted by WebGeek182 on Mon, 06 Mar 2023 16:41:47 +0300
_thread module of python multithreaded programming
In addition to deriving threads, the _thread module also provides basic synchronization data structures, also known as lock objects (lock objects, also known as primitive locks, simple locks, mutexes, mutexes, and binary semaphores).
The following are commonly used thread functions:
functiondescribestart_new_thread(function,args,kwargs=None)F ...
Posted by JeroenVO on Mon, 06 Mar 2023 15:58:48 +0300
Day Four Practice
Topic 1: Merge two sorted arrays
Idea: first add the elements in nums2 to nums1, and then perform ascending operations on nums1.
code:
public static void merge(int[] nums1, int m, int[] nums2, int n) {
for(int i=0;i<n;i++) {
nums1[m+i]=nums2[i];
}
Arrays.sort(nums1);
}
Screenshot of successful operation:
Topic 2: The s ...
Posted by the-hardy-kid on Mon, 06 Mar 2023 13:38:57 +0300
The second day of learning java from zero foundation
day_02
1.elsipe creates a new Java project
File-"new"-project in the upper right corner
Find src, select it with the mouse, right click new->packages to create a package
Select the package, then right click new-"class
...
Posted by intercampus on Sun, 05 Mar 2023 14:17:55 +0300
Views and indexes in Hive
Hive's view is actually a virtual table. The view can save a query and operate on the query like a table. The view is a logical structure and does not store data.
Indexes in Hive have only limited functions. There is no concept of primary key and foreign key in Hive. Some operations can be accelerated by indexing some fields. Hive c ...
Posted by regiemon on Sat, 04 Mar 2023 18:22:11 +0300
C++11 - new features of classes
default member function
Eight default member functions
Before C++11, a class had the following six default member functions:
Constructor.destructor.copy constructor.Copy assignment function.Take the address to overload the function.const takes the address to overload the function.
Among them, the first four member functions are the m ...
Posted by Melville on Sat, 04 Mar 2023 08:21:55 +0300
FPGA development basics one (interface) UART serial port
written in front
Starting from this article, the basic knowledge of fpga development will be serialized, and the simple fpga development experience in the past few years will be sorted out.
First, the basic concept of UART serial communication
Serial port communication is a very basic and widely used low-speed communication interface. Wh ...
Posted by bellaso on Fri, 03 Mar 2023 23:11:03 +0300
Practical use of Vue in development
Practical use of Vue in development
Solve the slow loading of the first screen of the SPA single-page application
First Contentful Paint (First Contentful Paint) refers to the time from when the browser responds to the URL address input by the user to when the content of the first screen is rendered. At this time, the entire webpage does not ...
Posted by kee2ka4 on Fri, 03 Mar 2023 03:27:34 +0300