discrete device

Test instructions: For some colored dots, find the smallest rectangle, which exactly includes half of the red dots, and does not include the blue dots.Solving: Violence, seeking a two-dimensional prefix and, with the principle of tolerance to update. n is small so I used discrete optimization and ran a 0ms.Did not write two-dimensional prefix and, plus discrete write is not very skilled, so engaged for 2 ho

Understanding Discrete Fourier Transformation (4) ------ complex form discrete Fourier transformation uses the complex method very cleverly, making the Fourier transformation more natural and concise, it does not simply use the replacement method to use the plural, but analyzes the problem from the perspective of the plural, which is totally different from the real DFT. I, Returns the positive cosine of a n

Task Draws a three-dimensional surface with a given discrete point, for example to the following data: % x y z 1 2 3 1 5 2 2 3 4 3 8 5 ... Analysis 1. Data is not an interval grid data In this case, you cannot directly use functions such as mesh, surf, and so on, because these functions require a grid form for the data format, and each point is equal to the interval, like this: This is not the case (the actual rules can be seen in the following fi

about boost Algorithm The boost algorithm is a set of integrated learning Algorithms (ensemble learning) based on the PAC learning theory (probably approximately correct). The fundamental idea is to construct a strong classifier with high accuracy by using several simple weak classifiers, and the PAC learning theory confirms the feasibility of this method. The following comparison of several boost algorithms is based on the article "Additive Logistic regression a statistical View of boosting" s

12. SystemA system is a transformation (transformations, a description of motion expressed in linear algebra)A discrete time domain signal x is mapped to a discrete time domain signal y. For example: magnetic resonance imaging System. Where is offset translated into: compensation system? Decimate translation into a sampling system?Summarize:The system transforms one signal into another (transform) signal by

Tree-related knowledge points:Relative to the Tsinghua University Press this "discrete mathematics" about the tree of this chapter is relatively simple, the concept is not much, about trees, forests, leaves, sub-fulcrum, spanning tree, the minimum spanning tree concepts are very simple, here no longer, the following records several theorems and important algorithm steps.Theorem 1: Set tProof: Set T has k leaf, then there are n-k branch points (the deg

discrete coordinates are 1,3,5.....2*k+1. 0 and 2*k+2 are peripheral. I compressed the whole picture into one dimension, for example (x, y) corresponding subscript is x* column width +y, next is BFS, first to pass the place all marked 1, other placesLabeled as-1, at this point I just need to add (0,0) to the queue (you can think about why) and mark all the places you can go to 0. But one thing to be aware of, because I was enlarged twice times, if th

Topic Link: Click to open the linkTitle Description: Given some rectangles, the total area of these rectangles, if there is overlap, only one timeThinking: Scan line + line tree + discrete (code scan from top to bottom)Code:#include Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced. hdu1542 Atlantis (scan line + segment tree + discrete) rectangular i

Problem: Generating a kernel density map from discrete pointsSolution: Use Arctoolbox tool to make kernel density mapWorkaround:(1) Arctoolbox-->spatial Analyst Tool--density analysis---Kernel density analysis.(2) Enter the parameters. Note: The population field can be none; the output cell size in the experiment is 0.0001; The search radius needs to be tried to set a suitable value for better results, set to 0.01 in the experimentComplete to view res

number of squares that can be coated with K is a+n-b, The number of squares that can only be painted in K-1 is x*n-(a+n-b); the coloring scheme for x lines is temp=k^ (a+n-b) * (K-1) ^ (x*n-(A+n-b)) and if temp=r, temp is the answerAgain consider the case of line x+1, if the X Act is not a color of the lattice, then the next row of its adjacent lattice coloring scheme is K, otherwise K-1, the number of K-1 can be painted C, then temp=temp*k^c* (K-1) ^ (n-c), if temp=r, then temp is the answerTh

Discrete Logging Time Limit: 5000MS Memory Limit: 65536K Total Submissions: 4236 Accepted: 1948 DescriptionGiven a prime P, 2 BL = = N (mod P)InputRead several lines of input, each containing p,b,n separated by a space.OutputFor each line print the logarithm to a separate line. If There is several, print the smallest; If there is

POJ 2417 Discrete Logging BSGS Discrete Logging Time Limit:5000 MS Memory Limit:65536 K Total Submissions:4011 Accepted:1849 DescriptionGiven a prime P, 2 BL == N (mod P) InputRead several lines of input, each containing P, B, N separated by a space. OutputFor each line print the logarithm on a separate line. If there are several, print the smallest; if there is

ways. Sample Input 35 510 110 128 Sample output Case #1: 22Case #2: 1023Case #3: 586 Question: Give a number ranging from 1 to n and ask how many subsets of LCM are greater than or equal to M. Idea: m is very large, and the subset also has 2 ^ 40, but it is found that the minimum public multiple range is only more than 40 thousand, therefore, we can use DP [I] [J] to indicate that the minimum public multiples of the first I count are the number of J schemes, and the results of the minimum

bandwidth in the frequency domain. It is impossible to have signals and sequences with limited time domain length and frequency domain bandwidth. In addition, if the time domain is narrow, the frequency bandwidth is used. Dtft is time discrete, while the frequency domain is continuous. In Matlab, the special function is [h, w] = freqz (B, A, N ). If n is not specified, 512 is used by default. Here, B is the sequence X, and A is 1. In this way, onl

1) Bar chartBar charts are perhaps the most commonly used graphics, often used to show the relationship between categories (different categories on the x-axis) and values (numeric values on the y-axis). Sometimes the bar heights represent counts of cases in the data set, and sometimes they represent values in the data set (with The bar chart height represents the frequency (count) in the dataset, and sometimes represents the values in the dataset, which should be kept firmly in mind, otherwise c

See an interesting article on the Internet "the key to the girl of discrete Mathematics"Just use JS to write the above-mentioned pairing method:First set the variable //Boys Ideal List varMenpreference ={A: [1, 2, 3, 4, 5], B: [1, 3, 4, 2, 5], C: [3, 2, 1, 4, 5], D: [4, 5, 2, 3, 1], E: [5, 2, 1, 4, 3] }; //Girls Ideal List varWomempreference = { 1: [' A ', ' B ', ' C ', ' D ', ' E '], 2: [' B ', ' D ', ' A ', ' E ', ' C '], 3: [' E ', ' B ',

Naive Bayesian method is a classification method based on Bayesian theorem and independent hypothesis of feature conditions. Simply put, the naive Bayes classifier assumes that each feature of the sample is irrelevant to any other feature. For example, a fruit can be judged to be an apple if it has features such as red, Circle, and about 4 inches in diameter. Although these characteristics are interdependent or some characteristics are determined by other characteristics, the Naive Bayes classif

Algorithm Series 23: Audio playback and spectral display of discrete Fourier transform Audio playback and spectral display of the 23 discrete Fourier transform algorithm series Lead What is spectrum 1 Principle of spectrum 2 Selection of Spectrum 3 Calculation of the spectrum Show Dynamic Spectrum 1 Implementation Methods

MPEG adopts the discrete cosine transform (DCT-discrete cosine transform) compression algorithm proposed by Ahmed (a giant mathematician) in 1970s to reduce the spatial redundancy of video signals. DCT converts motion compensation errors or original image information blocks into coefficients that represent different frequency components. There are two advantages: first, signals usually focus most of their e

Discrete cosine transformation (DCT) Discrete Cosine Transform DCT (discrete cosine transform) is a common conversion encoding method for digital rate compression. The Fourier transformation of any continuous real-symmetric function only contains the cosine. Therefore, the cosine transformation has the same physical meaning as the Fourier transformation.