ibeacon distance

After two days of research, I think there are some things that need to be written and also help people　　This is an algorithm to find nearby people, looking for this article on the Internet http://blog.csdn.net/dyllove98/article/details/9795815, his calculation of the smallest square four vertices a bit of a problem.The first step, we think, if we want to find the nearby five kilometers of people, is not the first thought according to their latitude and longitude (if Lian degrees do not know how,

Reprinted from Http://blog.sina.com.cn/s/blog_635e1a9e0100z41v.html The distance vector routing (vector-distance) algorithm sends the complete routing table to neighboring routers, and the neighboring routers combine the received routing table entries with their original routing tables to perfect the routing table. Rumored route: Using the distance vector routing

) The common subsequence length of x (i) and Y (j). (a) if X (i) =y (j), then C (i) (j) =c (i-1) (j-1); (b) if x (i). =y (j), then C (i) (j) =max (C (i-1) (j), C (i) (j-1)); The solution of the original problem is C (len1) (Len2), and Len1, len2 are the length of the string, respectively, by the state transfer equation above.(2) editing distanceProblem Description: Editing distance (edit Distance), also kno

How do I determine the conversion of the blog. csdn. netvincent_czzarticledetails7963740 and above? The earth is constantly rotating around the Earth's axis (the Earth's axis is a hypothetical line through the earth's north and south poles and the Earth's Center), draw a large circle perpendicular to the Earth's axis in the waist, so that every point in the circle is equal to the distance between the north and south poles. How are these twines determi

. NET calculates the maximum minimum latitude and longitude within a specified range based on coordinates, calculates the distance between two points according to the latitude and longitude coordinates of two points (note: The units here are meters)#region calculates the maximum minimum latitude and longitude within a specified range according to coordinates, calculates the distance between two points, in m

I. the role of management distanceadministrative distance is a measure that determines the validity or trustworthiness of a routing protocol. In various routing protocols, sorting is done from the most believable to the most untrusted. Used to determine the best route when there are multiple paths generated by different protocols to the same destination. The default administrative distances for the different protocols commonly used are the following t

0x00 PrefaceRecently read a great share of this year's GDC, the Sebastian Aaltonen brought to the use of ray-tracing to achieve some interesting effects of sharing.Among them, he introduced to the signed Distance Field Shadow improvement, mainly reflected in the elimination of the SDF shadow of some artifact.The first time you see signed Distance Field Shadow is on the great god Inigo Quilez blog, more trad

Source: The beauty of programming 3.8 finding the maximum distance of a binary tree node If you look at the two-fork tree as a graph, and the connection between the parent and child nodes is considered bidirectional, let's define the number of "distance" between two nodes. Write a program to find the distance between the two nodes farthest apart in a binary tree.

Calculate the distance between two-point latitude and longitude under MySQL(2012-12-25 13:21:09)reproduced Tags: gossip Category: PHP The formula is as follows, unit meters:1th latitude and Longitude: lng1 LAT12nd latitude and Longitude: lng2 lat2Round (6378.138*2*asin (sqrt (POW (LAT1*PI ()/180-lat2*pi ()/180)/2), 2) +cos (Lat1*pi ()/180) *cos (LAT2*PI ()/180) * Pow (Sin ((Lng1*pi ()/180-lng2*pi ()/180)/2), 2)) *10

After converting the two value graph to signed distance field, you can achieve a smooth amplification with bilinear interpolation.Defined:To the foreground of distance field: The distance from each point to the nearest former attraction.Distance field to the background: distance from each point to the nearest backgroun

Edit Distance Edit distance (edit Distance), also known as Levenshtein distance, is the minimum number of editing operations required to turn between two strings, from one to another. Editing involves replacing one character with another character, inserting a character, and deleting a character. In general, the small

8. Dynamic Planning (1) -- The distance between string editing and string Planning The algorithm questions of dynamic planning are often frequent visitors to the pen questions of major companies. Among the public accounts of many algorithms, articles on "Dynamic Planning" are not uncommon. They are all trying to describe dynamic planning in the most easy-to-understand text, and some even use cartoons to explain it, read every article pushed by the pub

How are these longitude determined? The earth is constantly spinning around its axis (the earth's axis is a center of the north-south poles and the Earth.Imaginary line), in the Earth's waist draw a large circle perpendicular to the axis, so that each point on the circle and the North and south poles of the same distance, this circleIt is called "the equator". At the north and south sides of the equator, many circles parallel to the equator are drawn,

end face is the local meridian plane. The longitude of a point is the angle between the meridian plane and the Prime Meridian plane. Measured on the equator, from the Prime Meridian plane as the starting point, respectively east to West Measurement, the east measure value is called the longitude degree, the westward measure is called the longitude degree. Thus, the longitude of the ground is the direction and angular distance of the prime meridian. T

Image processing-chamfer distance transformation and image processing-chamfer Transformation Corner width and Distance Transformation for image processing Chamfer Distance Transform in image processing is often used in object matching and recognition, The algorithm generates the distance value of each pixel based on a

edit Distance definition :The editing distance, also known as the Levenshtein distance , is the minimum number of edit operations required between two strings, from one to another.Licensing edits include replacing one character with another, inserting a character, and deleting a character.For example, turn Eeba into ABAC: EBA (delete First E) ABA (r

Original: C # simple optimization of peak-seeking algorithm (including Edge peak, minimum peak, peak distance)The principle of core peak search algorithm reference Ronny, Link: The peak of the projection curve to find,C # Translation Principle code reference sowhat4999, Link: C # translate Findpeaks method in MATLABAncestors planted trees, posterity. Thank the original author for a detailed explanation.Here first to paste the translation code (slightl

The development of wireless technology to promote wireless products to the home users, by building a wireless network within the home, can let us anytime and anywhere through the installation of wireless network card notebook and desktop to enjoy the joy of wireless surfing. But for most of us, often in the use of wireless products on the existence of more or less misunderstanding, today we will introduce readers to the error of transmission distance,

Zhengan County is located in Guizhou Province and Zhongqing border of the remote poor mountain area, where the traffic is backward, the teacher out of learning and training opportunities are very few, resulting in Zhengan education is relatively backward, the distance education resources, the teachers and students here can use distance education to learn and use, I as a Zhengan County secondary vocational s

search for people near by latitude, and simple implementation by distance sorting This is a simple implementation, the small amount of data can still meet the demand, write here to make a record. Of course, I hope there are other better options. The main idea is: first, with their latitude and longitude as the center, the calculation of a certain radius of the square latitude and longitude boundary, and then use the square latitude and longitude boun