smach zero

In Smach, state is an important part of the state machine, and understanding the principle and implementation of States is helpful for using Smach, especially understanding__init__ (), execute (), preempt is especially critical.__init__ (): Initializes the function, initializes the parameter when the state is initializedExecute (): function executed by State runtimePreempt: Paused stateThe following explain

, so the big boys to develop this set of Smach state machine function Pack. And the idea of state machine is conforming to the problem of multi-data fusion and multi-subtasks execution of robot. The advantage of the state machine is that it is simple to implement, easy to maintain, and easy to reconstruct task sequence. Recent implementations have proven that Smach is precisely tailored for mission executio

For details about the/dev/null and/dev/zero files, and solutions for accidental deletion of/dev/null and/dev/zero, and the disk I/O Testing Method Using/dev/zero, disk deletion and recovery by mistake1. Introduction-explanation from Wikipedia/dev/null: In Unix-like systems,/dev/null, or an empty device, is a special device file that discards all data written into

1, Introduction--From the wiki interpretation/dev/null:In a Unix-like system, a/dev/null, or empty device, is a special device file that discards everything written to it (but reports a successful write operation) and reads it immediately to get an EOF.In programmer jargon, especially in Unix jargon,/dev/null is called a bit bucket or black hole. Empty devices are often used to discard unwanted output streams, or as empty files for input streams. These operations are usually done by redirection.

Detailed description of/dev/null and/dev/zero files, solutions for accidental deletion of/dev/null and/dev/zero, and disk I/O testing using/dev/zero1. Introduction-explanation from Wikipedia/dev/null: In Unix-like systems,/dev/null, or an empty device, is a special device file that discards all data written into it (but reports a successful write operation ), read it to get an EOF immediately./Dev/

The non-zero surround principle in the canvas and the canvas zero surround Principle Non-zero surround principle:If you need to determine whether a region needs to be filled with color, select a random point from the region. Pull a straight line from this point and be sure to pull it out of the graph. At this time, the point is the center of the circle.The line

The Webplus Zero (ABP) version is based on the most popular DDD framework ABP (full name ASP. Boilerplate), and the interface uses the Easyui framework. The multi-language and authorization authentication supported by ABP framework are embodied in this privilege system. If you feel that spending $849 to buy ASP. NET zero is not a good deal, then this system is one of your best options for learning ABP. Alte

[Zero basics python] Why is this topic required? Zero programming basics pythonThis topic is named "Zero basics Python ".There are already a lot of courses on the Internet to learn python, and there are also many excellent courses. It is reasonable to say that there is no lack of basic courses for me. However, I have noticed that, whether it is a course or a publ

Python uses the backtracking algorithm subset tree template to solve the problem of finding zero. python returns zero. The example in this article describes how Python solves the problem of finding zero Based on the subset tree template of the Backtracking Method. We will share this with you for your reference. The details are as follows: Problem There are 10 yua

Address: http://www.cnblogs.com/mu-mu/archive/2013/02/06/2893581.html Recently, in order to process the source code of HTML files, regular searches and replacement are required. So I took this opportunity to learn about the regular expression system. Although I used regular expressions before, I learned how to get through them temporarily. In the course of learning, I still encountered many problems, especially the zero-width assertion (I want to

Talking about the problem that MySQL databases contain zero values in China and Japan, mysql zero value By default, MySQL can insert 0 values into a date. In reality, 0 values in a date are meaningless. You can adjust the SQL _mode variable of MySQL to achieve the goal. set @@global.sql_mode='STRICT_TRANS_TABLES,NO_ZERO_DATE,NO_ENGINE_SUBSTITUTION';set @@session.sql_mode='STRICT_TRANS_TABLES,NO_ZERO_DATE,NO

Binary leading zero (, binary leading zero ( Binary leading zero Subject content: The computer uses binary to express all values. A decimal number, for example, 18, is expressed as 00000000000000000000000000011000 in a 32-bit computer. We can see that there are 27 0 numbers before the first 1 from the left. We call these zeros the leading zeros. Now, your t

Zero-knock cowhide: Linux2.6 kernel source code parsing _ process traversal, zero-knock linux2.6 /* *File : test.c *Author : DavidLin *Date : 2014-12-07pm *Email : linpeng1577@163.com or linpeng1577@gmail.com *world : the city of SZ, in China *Ver : 000.000.001 *history : editor time do * 1)LinPeng 2014-12-07 crea

My essays are all from my own handwriting, and the content is summarized after practice. Welcome to reprint, reprint please indicate the source: http://www.cnblogs.com/volcanol [Windows powershell] Powershell _ basic self-study course _ 1 _ first knowledge of powershell Powershell _ basic course _ 2_powershell and CMD and Unix/Linux Shell Powershell _ basic learning course _ 3 _ How to Use powershell ISE to debug PS scripts Powershell _ basic self-study course _ 4_powershell alias function

Label: style blog color ar SP Div on The following is a question I saw in a C language book. Write the statement for comparing the float type variables I with the zero value: 　if（（x >= -0.00001） (x You cannot use "=" or "! = "To compare it with a number, try to convert it into a format such as"> = "or" This is a common question for a programmer interview and a basic C ++ question. If you have read only a few basic programming introductory bo

Reference [1] http://www.cs.rit.edu /~ Icss571/filling/alt_parity.html [2] http://cs.hust.edu.cn/webroot/courses/csgraphics/jiaocai.php? Bookpage = 5_c_c [3] http://en.wikipedia.org/wiki/Nonzero-rule In Graphics, you can determine whether a point is within a polygon. If the polygon is not self-Intersecting, you can simply determine whether the point is inside or outside the polygon. If the polygon is self-Intersecting, therefore, it must be determined based on the non-

Hdu 1066 Last non-zero Digit in N! (Number Theory -- n! ), Hdunon-zero Last non-zero Digit in N! Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission (s): 6432 Accepted Submission (s): 1593 Problem DescriptionThe expression N !, Read as "N factorial," denotes the product of the first N positive integers, where N is no

07: matrix return-to-zero subtraction sequence and 07 matrix return-to-zero Subtraction07: matrix zeroth subtraction sequence and View Submit Statistics Question Total time limit: 1000 ms Memory limit: 65536kB Description Given a matrix of n * n (3 First, return to zero for the matrix: that is, all elements in ea

This article describes VMware thick provisioning delay zero, thick provisioning zero, thin provisioning concept and selection1, thick provision delay 0 (zeroed thick)Creates a virtual disk in the default thick format. Allocate the required space for the virtual disk during the creation process. Creation does not erase whatever data is kept on the physical device, but it will be reset to

JAVA amounts are apportioned proportionally, with zero Header Processing and java amounts allocated with zero Header Exact amount calculation is requiredBigDecimal; Evenly distributed, with a fraction of the allocation, usually composed of "precision" andApportionment CoefficientDetermined; HowZero HeaderTo ensureAverage as much as possibleAllocate. 1. Shared by households /*** Assignment by number of