ROS learning notes: Learning TF

0.TF initial experience http://wiki.ros.org/tf/Tutorials/Introduction%20to%20tf 1.Writing a tf broadcaster (C++) In the next two tutorials, we will write code to reproduce the demonstration in the tf introductory tutorial. After that, the following tutorial will focus on extending the demo with more ...

Posted by think-digitally on Sat, 27 Jun 2020 11:20:42 +0200

Cardinality sorting (Java)

Cardinality sorting (Java) Blog description The information involved in this article comes from Internet collation and personal summary, which means personal learning and experience summary. If there is any infringement, please contact me to delete, thank you! Introduction to cardinality sort (bucket sort) radix sort belongs to distribution s ...

Posted by eagleweb on Sat, 27 Jun 2020 11:09:37 +0200

RocketMQ dead letter queue | how to deal with the exception of the consumer?

stay RocketMQ repeated consumption problem | the introduction of idempotent mechanism into the core process of order system In this paper, we discuss the problem of repeated message consumption. A better solution is to use business judgment on the consumption side to ensure the idempotence of the interface, so as to avoid the problem of repeate ...

Posted by GaryE on Sat, 27 Jun 2020 10:41:09 +0200

Android studio novice development: weather app (Baidu map api + wind weather api + city query + broken line display)

Android studio novice development: weather app (Baidu map api + wind weather api + city query + broken line display) 1. Content introduction 2. Environment configuration 3. Import another demo 4. AS project analysis 5. Weather project flow 6. Data exploration 7. Module architecture 8,sharedpreference 9. C ...

Posted by jej1216 on Sat, 27 Jun 2020 10:24:04 +0200

How about your code "balance"? Find the balance between simplicity and readability

Yunqi information:[ Click to see more industry information]Here you can find the first-hand cloud information of different industries. What are you waiting for? Come on! Python is very friendly to beginners. Many people choose Python when they start to learn programming. Easy to use is the first advantage you find when you touch it. After lea ...

Posted by kante on Sat, 27 Jun 2020 10:19:09 +0200

Task 3 Mysql multi table & foreign key & database design

1 multi meter 1.1 multi table description In actual development, a project usually needs many tables to complete For example, the database of a shopping mall project needs many tables: user table, classification table, commodity table, order table 1.2 disadvantages of single table 1.2.1 table building C ...

Posted by powaz on Sat, 27 Jun 2020 10:16:57 +0200

OpenCV learning: basic image manipulation: Smooth and Blur

Common filter Mean filtering Mean filtering is also called linear filtering, and its main method is neighborhood averaging. The basic principle of linear filtering is to replace each pixel value in the original image with the mean value, i.e. the current pixel point (x, y) to be processed, select a ...

Posted by madspoihur on Sat, 27 Jun 2020 09:54:11 +0200

One level of mybatis cache

For the mybatis framework. It seems to be used in copy all the time. For mybatis caching. There is no accurate cognition. Take advantage of the holiday. Learn the cache of mybatis. This article mainly studies the first level cache of mybatis. Why cache In fact, we have been working for a long time, and we know that many bottlenecks ar ...

Posted by yelvington on Sat, 27 Jun 2020 09:29:25 +0200

cron of Go daily

brief introduction cron A library for managing timing tasks, using Go to achieve the effect of crontab command in Linux. We introduced a similar Go library before—— gron . gron code is small, which is better for learning. But its function is relatively simple, and it is no longer maintained. If there is a need for timed tasks, cron ...

Posted by vchris on Sat, 27 Jun 2020 09:10:13 +0200

After the epidemic, Python made a visual travel strategy

  preface The text and pictures of this article are from the Internet, only for learning and communication, not for any commercial purpose. The copyright belongs to the original author. If you have any questions, please contact us in time for handling. What do you want to do most after the outbr ...

Posted by flyersman on Sat, 27 Jun 2020 08:49:04 +0200