# mathematical formula

• Entropy - the first farmers entropy

Shannon to probability and mathematical statistics as a tool to measure the amount of information put forward a mathematical formula for the discrete source, when it was formed by a number of random events, random events occur with the uncertainty de

• Data Mining common terms (transfer)

"Algorithm" is used to implement a data mining technologies - such as the classification tree analysis, and so identify the specific program. "Property" is also known as the "characteristics", "variable", or from a

• <<More Joel on Software>> ease of use is not enough

Ease of use is not enough (translation) Author: Ruan Yifeng Date: January 30, 2009 During the Spring Festival, I did two things. The first thing is to participate in a number of relatives and friends gathering, eating a lot of high-calorie high-fat f

• Bitcoin principle of virtual currency

Original Source: http://ivarptr.blogspot.com/2011/05/bitcoin.html , reproduced Keep the original source. Bitcoin is a hot topic recently, but very little information in Chinese, this article will not comment on the significance and advantages and dis

• mongoDB in action (2)

Getting and Starting MongoDB MongoDB almost running as Network Service, clients can access and manipulate, to start mongodb, run the executable file mongod \$. / Mongod . / Mongod - help for help and startup options Sun Mar 28 12:31:20 Mongo DB: start

• [Transfer] Three methods of solving Fibonacci (Fibonacci) series: Recursive method. Iteration. The general formula method

The so-called Fibonacci sequence refers to a series, the former two are one, are from the third start of the first two combined. With a mathematical formula is: 1 (n = 1,2) fib (n) = fib (n-1) + fib (n-2) (n> 2) Can permit Ming Feibo of Number of gen

• Start a mysql syntax

Function and syntax: mod (n, m) = n% m Remainder Bitwise | & ~ bits or, respectively, bit and, bit-wise inverted BIT_COUNT (N) find the number of bits n Logical not!, Or | |, and & &, Comparison operators <,>, =, <>! =, <=,>

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• Summary mathematical formula

Higher math papers * Square relationship: sin ^ 2 (α) + cos ^ 2 (α) = 1 tan ^ 2 (α) +1 = sec ^ 2 (α) cot ^ 2 (α) +1 = csc ^ 2 (α) * Product of the relationship: sinα = tanα * cosα cosα = cotα * sinα tanα = sinα * secα cotα = cosα * cscα secα = tanα *

• SICP Exercises 1.6-1.8

Exercise 1.6 Because there is new-if cond vest, if do not have the special nature. One of the predicate and the then-clause will be passed as an argument cond, two statements will be run. So not run the correct result. Two processes by trace, you can

• Implementation of the Equation Editor feature

Formula compiled function: to achieve formation of complex mathematical formulas. Principle is implemented in the compiler to select a symbol type, at compile box in a coded form is displayed. Many use the Internet to do LaTex compiler is basically a

• 1. What is the SQL optimization

The first step for SQL optimization, make it clear what is SQL optimization, our ancestors said, to know ourselves, to know yourself. Share my experience in the optimization before talk about what is SQL optimization. SQL optimization, the name sugge

• One. What is the SQL optimization

The first step in the SQL optimization, must be clear what is the SQL optimization, our ancestors say, know ourselves, to know yourself. To share my experience in the optimization of the former, let us talk about what is the SQL optimization. SQL opt

• I. What is SQL optimization

The first step in the SQL optimization, must be clear what is the SQL optimization, our ancestors said, Know thyself, know yourself. To share my experience in the optimization of the former, let us talk about what is SQL optimization. SQL optimizatio

• [Reprinted] WordPress in the cookie mechanism

http://cn.yflying.com/2010/07/wordpress% E4% B8% AD% E7% 9A% 84cookie% E6% 9C% BA% E5% 88% B6 / WordPress uses cookies technology (that allows web servers to store a small amount of data to the client's hard drive or memory, or read from the client's

• Bayesian filtering technology

Bayesian regarded as the most effective anti-spam technology, effective filtration rate is 98%, the network on some of this information, but not Bijiao obscure Jiu Shi evasive, So this article hopes to more popular, but also introduces the technology

• OGNL small application - Dynamic mathematical formula

OGNL parser: import ognl.Ognl; import ognl.OgnlContext; import ognl.OgnlException; public class OgnlExpression { /* Expression */ private Object expression; /* expressionString OGNL expressions for */ public OgnlExpression(String expressionString) th

• JOGL NeHe Tutorial Lesson VIII Mixed

In this class, we added on the basis of texture mixing, it looks transparent effect, of course, it is not so easy to explain, of course, hope you like it. Simple and transparent OpenGL in the vast majority of effects are related to certain types of (

• Domain Specific Language DSL

Domain Specific Language (domain specific language / DSL) The basic idea is "to seek special not demand perfection", not as general-purpose target language covers all software, but the problem specific to a particular computer language. DSL is t

• 0 / 1 secret: direct access binary algorithm in a number of

[Description] problem: given a n-digit binary number, statistics on the number 1 ] [Algorithms: the binary number according to each of two groups, in each of the two in a number of, stored in a binary number in. Then the above iterative process, it h

• Insert mathematical formulas

First insert a mathematical formula, and then design the tab appears, and then you can insert other things

• Fibonacci series, cattle farmers, the problem

Write down their own look. Questions: (CSDN seen) A farmer raising a cow, three years later, the cow will give birth to a cow each year, born three years after the cattle, but also give birth to a cow every year ... ... after 10 years, asked a farmer

• as alternate theory, the formula (1)

Geometric formulas and theorems (middle) some commonly used mathematical formula 1 had two points and only a straight line 2, the shortest line between two points 3, the supplementary angle with the same angle or isometric 4 with the same angle or is

• Mouse effects - the production of flexible framework

Sent before the tutorial, I would like to thank the friends, a classic, he describes a mathematical formula editing software MATHTYPE, told me to write this tutorial has been of great help. But who can not remember a time, it can not find to. If you

• Mathematical formula

[Sine, cosine] ] [Dot (dot product) Also known as the scalar product, as shown below: Note that the dot product result is a scalar: Number of product line with the exchange of law: [Cross product] (cross product) Also known as the vector product, the

• Keyboard characters and pronunciations

# Hash / sharp numbersign, digital signs. English-speaking countries is a hash, American English is the pound, music for sharp, such as C #. Computer programming language C # (read C Sharp) * Asterisk star (English), n. an asterisk in the mathematica

• Reposted elsewhere Information System Modeling Method

Author: Zhou Zhongyuan http://web.tongji.edu.cn/ ~ yangdy / research.html ---- Large information systems are often very complicated, it is difficult to directly analyze the design, often using models to design the analysis system. Model is the real w

Haskell is a "pure" functional language, can explain the operation cost can also compile code. The process of their generally compiled into C code, Mr. (said to be the exact C -), then use the built-in gcc compiler. Haskell compiled small size,

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