imaginary unit.We define that the WN = e^ (2∏i) is the primary n-th unit root, then all n units of the plural root are its sub-sides.If we ask for a (WNK), we should adopt the idea of divided treatment.We separate the parity coefficients (assuming n is an even number first), which is definedA1 (x) =a0 + a2* x + a4 * x2 + ...A2 (x) =A1 + a3* x + a5 * x2 + ...So a (x) =a1 (x2) + xA2 (x2).To calculate a (Wnk) =a1 ((WNK) 2) + wnkA2 ((WNK) 2),Need to use (WNK) 2 = wn/
In the compression sense, always see the word "Matrix satisfies RIP", yes, this is a compression-aware terminology, bounded equidistant properties (Restricted isometry property, RIP).Note: Rip nature is also for the perceptual matrix, not the measurement matrix.0. Related concepts and symbols1. RIP definitionChinese version:English version:Summarized:(RIP) matrix satisfies the 2K order RIP to ensure that any K sparse signal θk can be mapped to a uniqu
Hamiltonian loop such as, the white dot is the singularity on the smallest spanning tree. We can get two disjoint matches (1-2, 3-4, ..., 2k-1-2k and 2-3, 4-5, ..., 2k-1) by short-cutting the singularity in order. Because of the triangle inequality, the sum of the two matching weights is certainly not greater than $\text{opt}$, then the lesser of the two matches
The purpose of designing JSPs is to separate the tasks of Web developers from the tasks of non-developers who design dynamic page UIs. Unfortunately, JSP is too complex for many designers and it is tricky to add a layer of software to solve a variety of dynamic content issues. (for example, internationalization requires that the text be stored elsewhere and referenced by a key.) So for most projects, Java developers have to deal with JSP code themselves, which often includes the work of the desi
number will be much larger than the single-precision floating-point numbers. For the value of the order E, the value of the floating-point number can be divided into three different cases, which are normalized, non-normalized and special values, and these three cases are the essence of floating-point numbers.The following LZ first give a book for the single-precision three of the picture description, respectively, is 1, 2, 3, where 3 is the special value and divided into two cases 3a and 3b. Yo
VOC 2007 test set on the detection example. Our approach can detect targets in a wide range of scales and aspect ratios.Pan-invariant anchorin the position of each sliding window, we also predict the K-region recommendations, so the reg layer has 4k output , that is, the K-box coordinate coding. The CLS layer outputs a 2k score , which is the estimated probability of the target/non-target for each suggestion box (for simplicity, a CLS layer implement
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The general tree is a one-to-many relationship, the use of sequential structure storage is more difficult, but the binary tree is a special tree, each node has a maximum of two nodes, and the child nodes have the right and left points, and brothers, fathers, children can be very convenient by number, so we use the sequential storage structure using two-tree storage.
Binary tree Each node has up to two children, so for it to design a data field and two pointer fields, we call such a linked li
2K Company's classic game "bio-Jones" is now from the Apple App Store shelves, and did not make a clear explanation and compensation instructions. As early as July, the game was not suitable for iOS8.4 "black screen" and other issues."BioShock" is a 2K company to create a very classic shooting game, on the PC and host platform has a high popularity, last year, the migration to the iOS platform has won a lot
are usually incompatible and in one segment because of a semi-closed connection, in which case the client cannot send the data to the server after the connection is closed. However, the server can also send data to the client until the server closes the connection.3. Flow controlIf the sending side is sent at a faster rate, the receiver receives the data after the processing is slow, and the size of the receive buffer is fixed, the data is lost. TCP protocol through " " Sliding window ( Sliding
characters. After finding the name group, you can compare the size of any two suffixes with only O (1) time. After finding one of the suffix arrays or the rank array, you can use O (n) time to find the other one. Any two suffixes if you compare the size directly, you need to compare the characters n times, that is, at the latest in the comparison of the nth character will be able to separate the "winner".1.2. Multiplication algorithmThe main idea of the multiplication algorithm is to sort the s
the sending side is sent at a faster rate, the receiver receives the data after the processing is slow, and the size of the receive buffer is fixed, the data is lost. The TCP protocol solves this problem through a "sliding window (Slidingwindow)" mechanism. Look at the communication process in the diagram below.
1. Send side initiates the connection, declares the maximum segment size is 1460, the initial sequence number is 0, the window size is 4K, indicates "My receive buffer also has 4 K byt
be good, and you will not care about the bad. In a way, deliberate practice is a mistake-centred exercise. Practitioners must be extremely sensitive to errors, and will feel very uncomfortable if they find themselves wrong and have been practicing until they are corrected.From a training point of view, what is a really good coach like? John Wooden is the most legendary university basketball coach in the United States, who led the UCLA team to win the NCAA
Using Python's Django framework to generate PDF files,
The portable document format (PDF) is developed by Adobe and is mainly used to present printable documents, including pixel-perfect format, embedded fonts, and 2D vector images. You can think of a PDF document as the digital equivalent of a printed document; indeed, PDFs are often used in distributing parameters for the purpose of printing them.
It's easy to use Python and Django to generate PDF documentation thanks to an outstanding open so
Title Description:An integer can be split into the sum of 2 powers, for example: 7 = 1+ 2 + 4 7 = 1 + 2 + 2 + 2 7 = 1 + 1 + 1 + 4 7 = 1 + 1 + 1 + 2 + 2 7 = 1 + 1 + 1 + 1 + 1 + 2 7 = 1 + 1 + 1 + 1 + 1 + 1 + 1 There are six different ways to split Another example: 4 can be split into: 4 = 4, 4 = 1+1+1+1, 4 =, 4 = 1+1+2. use f (n) to denote the number of different splits of N, such as f (7) = 6. required to read n (not more than 1000000), output f (n)% 1000000000. Problem Solving Ideas:F
, if it is negative, it may be 0 or 1, depending on the computer system used.③, ">>>" unsigned Right shift, the right bit is squeezed out, for the left to move out of the space to fill 0.According to the characteristics of the binary number, I believe that everyone is well understood.For given an arbitrary decimal number xnxn-1xn-2 .... X1x0, we decompose it with a binary representation method:Xnxn-1xn-2 .... x1x0 = xn*2n+xn-1*2n-1+......+x1*21+x0*20 3-1 formulaThe decimal number here is only th
of the product of the W bit is the same as the low w bit of the product of the unsigned number. This means that the computer can use a single instruction to perform unsigned and complementary multiplication operations.
The proof of this process is given in the book, so let's take a look at the relationship between unsigned and complementary codes, where x ' and Y ' represent the complement codes for x and Y, respectively.
The main technique used here is 2w mod 2w = 0.
optimization of multiplic
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