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I. Theory Article 1. Mathematical formulasCircle Area formula: Π*r*r, where π is pi, R is the circle radius;Square area formula: S*s, where S is the edge length;Pythagorean Theorem: a*a + b*b = c*c, where A/b is right triangle two right-angled edges, and C is the hypotenuse.2. Calculation methodConsider that the square with the side length r is embedded with a 1/4 circle with a radius of R.650) this.width=650; "title=" image "style=" border-right-widt

To make the Raspberry Pi convenient operation, it is necessary to configure the wireless network card, which can greatly enhance the mobile and convenience of Raspberry Pi, in fact, the configuration of wireless network card is basically the same as the normal Linux platform configuration wireless network card, several methods are similar, the following:One, the first method: through the configuration of th

Screen is a virtual Terminal manager. We can use it to manage the terminal interface in the background so that when SSH disconnects, there is no need to be afraid of an ongoing operation interruption.First, installationsudo apt-get updatesudo apt-get Install screenSecond, use1. Create a virtual terminalUse putty to log in to the Raspberry Pi after execution:Screen-s Terminal1This creates a terminal named Terminal1.At this point we can do anything, suc

 [excerpt from Baidu Encyclopedia] Monte Carlo method, also known as the statistical simulation method, is the the mid 1940s due to the development of science and technology and the invention of electronic computers, and was proposed by the probability of statistical theory as the guidance of a kind of very important numerical calculation method. means using random numbers (or more common pseudo-random numbers) to solve many computational problems. It corresponds to a deterministic algorithm.

Tag: Dial get Sha file network div reg NULL implementationWant to know how the Raspberry Pi through the 4G Network module communication How to achieve, see this article (http://www.lxway.com/95811506.htm), ready to next have the opportunity to practice, first retained learning;One, 4G Luci configuration1. Create a new Wwan interface;2, the Internet mode for automatic access to DHCP;3, the physical setting choice wwan0;4. Firewall Select WANSecond, the

Raspberry Pi apt software management tool and Raspberry Pi apt Tool The easiest way to manage installation, upgrade, and uninstall software is to use APT (Advanced package management tool) On Debian ). If a software package into a Debian package and is applicable to Raspberry Pi's ARM architecture, the package is also compatible with Raspbian. You need the root user permission to install or uninstall the so

: Sometimes we want to remotely connect to a linux GUI to manage machines. here we need to use tightvncserver and xtightvncviewer. The ip address of my Raspberry Pi is 10.141.247.134. the ip address of the client to connect to Raspberry Pi is 10.141.247.12. 1. Install tightvncserver on raspberry's machine first (set the software source based on another blog post) Sudo apt-get install tightvncserver 2.

Code:1#include 2 intMain () {3 ConstArrsize=1010, dispcnt= +;//define the array size, display the number of digits4 //Const arrsize=10100, dispcnt=10000;5 CharX[arrsize], z[arrsize];//x[0] x[1]. x[2] x[3] x[4] .... x[arrsize-1 ]6 intA=1, b=3, C, D, run=1, cnt=0, I;7 for(i=0; i){8x[i]=0; z[i]=0;9 }Ten //memset (x,0,arrsize); One //memset (z,0,arrsize); Ax[1] =2; -z[1] =2; - while(Run (++cnt200000000)){ the //Z*=a; -D =0; - for(i=arrsize-1; I>0; i--)

Using the Math. PI circumference rate attribute in JavaScript, javascriptmath. pi This returns the ratio of a circle to its circumference, about 3.14159.Syntax Math. PI Example: This produces the following results: Property Value is: 3.141592653589793

Python method for calculating pi of circumference rate, python pi of circumference Rate The example in this article describes how to calculate the circumference pi of python. Share it with you for your reference. The details are as follows: from sys import stdout scale = 10000 maxarr = 2800 arrinit = 2000 carry = 0 arr = [arrinit] * (maxarr + 1) for i in xrange(m

Tags: mysq detailed date RAS code details Tips-o apt MySQL occupies too much memory, and SQLite is a lightweight 0 configuration database, ideal for use in Raspberry Pi and other embedded systems. SQLite documentation is rich in detail, this article will not explain in detail all aspects of the SQLite database operations, can only be combined with specific scenarios on-demand description. The SQLite techniques described in this article can also be use

Previously configured Raspberry Pi installation Zmap has not been installed successfully, and today tried again, installed successfully, recorded.Good Job.Zmap Address:Https://zmap.io/documentation.htmlStep1:git clone git://github.com/zmap/zmap.gitStep2:Apt-get Install build-essential cmake libgmp3-dev libpcap-dev gengetopt BYACC FlexStep3:Cmake-dwith_redis=on-dwith_json=off-denable_development=off-denable_hardening=off./STEP4:MakeSTEP5:Make installTh

Reprint please specify: @ Xiao Wu Yi Http://www.cnblogs.com/xiaowuyi qq Group: 64770604The Raspberry Pi production NAS process is described in http://www.cnblogs.com/xiaowuyi/p/4051238.html.Bypy is a Baidu cloud/Baidu network Disk Python client, the main purpose is in the Linux Environment (command line) sync Baidu Cloud disk space. Bypy requires more than python2.7 version, the latest version is Https://github.com/houtianze/bypyFirst, Bypy installati

0 PrefaceThis document describes how to modify the Raspberry Pi software source. If you use the raspbian system, the method for modifying the software source is the same as that for Ubuntu, you can find the latest software source image in the http://www.raspbian.org and modify the content in the/etc/APT/sources file. [Related blog] [Raspberry Pi Study Notes-index blog]-Please pay attention to more blog post

About Raspberry Pi: Raspberry Pi is a Linux-based PC equipped with a 256 MHz processor, memory, SD card and Ethernet support. It has two USB interfaces and supports HDMI and RCA output. It is reported that although the Raspberry Pi looks very mini-it only has one credit card, it can run games like thunder hammer 3: arena and play P videos. The hardware foundation

Audio output can be set to automatic, headset output, and HDMI output. The default value is automatic. Pi @ aborn ~ $ Sudo apt-get install alsa-utilspi @ aborn ~ $ Sudo modprobe snd-bcm2835 # Add the sound module to the kernel pi @ aborn ~ $ Sudo aplay/usr/share/sounds/alsa/Front_Center.wav pi @ aborn/opt/vc $ sudo amixer cset numid = 3 2 numid = 3, iface = MIXE

Draw a square with a side length of R and a circle with a radius of R of One-fourth (as shown), throw darts at random, and calculate the π value by calculating the proportion of darts falling in the star area and the whole area.The formula is deduced as follows:Assuming that the square's side length R is 1, then the Dart falls on any point in the Star area (x, y), and its coordinates are bound to be less than 1 of the sum of squares (x2+y2).The code is as follows:ImportRandomdefFind_pi (num_of_t

Raspberry Pi configures apache php and Raspberry Pi apachephp Apache + MySql + Php. 1, InstallationApache Apache can use the following command to install sudo apt-get install apache2 The default Apache path is/var/www/ The configuration file path is/etc/apache2/ You can use sudo nano/etc/apache2/ports. conf to modify the listening port number. Restart the service to take effect: sudo service apache2 rest

Raspberry Pi (Raspberry Pi) builds a Linux system (PiLFS) from scratch (II), raspberrypilfs 7. Build a temporary system 1. General Compilation Guide A. Check whether the settings are correct.LFSEnvironment Variable echo $LFS B. Assume that you have correctly set the host system requirements and symbolic links. C. For each software package: (1) make sure you useLfsUser (2) Unless otherwise specified, delete

JAVA exercise-calculate the circumference rate π and circumference rate π for given precision Returns an approximate value of the circumference rate π with a given precision. Given formula: π/4 = 1-1/3 + 1/5-1/7 + 1/9 -... 1 public static void main (String [] args) {2 System. out. println ("Enter the precision of π (the number of digits after the decimal point)"); 3 bytes input = new bytes (System. in); 4 double I = input. nextDouble (); 5 double p = pi