math cst

In the process of programming, we often perform mathematical operations on some numbers, such as what we want to ask for absolute or cosine. Do these methods need to be implemented by ourselves? In fact, the math class math class in Java.lang contains methods for performing basic mathematical operations, such as elementary exponents, logarithms, square roots, and trigonometric functions. Let's learn it!Let'

Math Object method Method Description ABS (x) The absolute value of the return number. ACOs (x) The inverse cosine value of the returned number. ASIN (x) Returns the inverse chord value of the number. Atan (x) Returns the inverse tangent of x with a value between-PI/2 and PI/2 radians. ATAN2 (y,x) Returns the angle from the x-axis to the p

BC Math function Table of Contents Bcadd -Addition calculation of 2 arbitrary precision numbers Bccomp -Compare two arbitrary-precision numbers Bcdiv -2 digit division calculation with arbitrary Precision Bcmod -modulo an arbitrary precision number Bcmul -2 arbitrary precision numerical multiplication calculation Bcpow -The exponentiation of arbitrary precision numbers Bcpowmod -raise An arbitrary precision number to a

Properties of the Math object: Call method: Math. Method Name (); MATH.E: Returns the value of Euler constant E. MATH.LN2: Returns the logarithm of the natural number 2. MATH.LN10: Returns the logarithm of the natural number 10. Common methods: Math.log (N): Returns the logarithm of the natural number of N. MATH.LOG2E: Returns the logarithm of 2, E, where 2 is mutable and any n. Math.PI: Returns the value o

JS has a built-in object--math object, in some cases very useful, let us analyze: Math Common Properties (note to capitalize): e returns the arithmetic constant E, that is, the base of the natural logarithm (approximately equal to 2.718)LN2 returns 2 of the natural logarithm (about 0.693)LN10 returns 10 of the natural logarithm (about 2.302)LOG2E returns the logarithm of the 2-based E (about 1.414)LOG10E

Welcome to my blog! Math Companion for primary school Software size: 32027 KB Software language: Chinese Simplified Software Category: Domestic software/shared edition/Science tools Application Platform: win9x/nt/2000/xp/2003 Interface preview: No Plugin situation: Complaints Update Time: 2007-07-09 14:53:53 Number of downloads: 21023 Recommended level:

Recently the project is very busy, the function that gives me is more complex, fortunately can cope with down. In the process of working, I found that the use of MySQL's own function can greatly reduce the complexity of the program. This is inevitable, using the MySQL function, can save a lot of loop traversal in the program. But some experts on the internet say that using math and string functions in MySQL will slow down MySQL's efficiency, which I t

// Mathematical function -- abs returns the absolute value of the number vara;/* aMath. abs (-12); alert (a); // 12 // mathematical function -- returns the arc cosine of acos... syntaxHighlighter. all (); // Mathematical function -- abs returns the absolute value of a number var a;/* a = Math. abs (-12); alert (a); // 12 // mathematical function -- arccosine of acos return number a = Math. acos (numeric exp

: Judging functionPublic boolean matches of the String class (string regex)B: Split functionPublic string[of the String class] split (string regex)C: Replace functionpublic string ReplaceAll of the String class (String regex,string replacement)D: Get FeaturesPattern and MatcherPattern p = pattern.compile ("A*b");Matcher m = P.matcher ("Aaaaab");Find (): Lookup does not existGroup (): Get the data you just looked upNote: Group must first call find after.(4) CaseA: Determine phone number and mailb

3D Math Base VectorA vector can be seen as a line segment with direction and size.For example: If we subtract point B from point A, we can get a vector that has a direction of point B facing point A, and a distance of two points. This method is often used in game development, for example, we want to object B to object A, usually using the position of object B minus the position of object A, the resulting vector modulus.Dot ProductThe dot product of a

the round is rounded ... Ceiling is rounding up. Float is rounded downHere are a few ways to round decimal values to integers: Math.ceil (), Math.floor (), and Math.Round (). These three methods follow the following rounding rules, respectively:Math.ceil () performs an upward rounding, that is, it always rounds the value up to the nearest integer;Math.floor () Performs a downward rounding, that is, it always rounds the value down to the nearest integer;Math.Round () performs a standard rounding,

determines whether there is a return true, otherwise returns false;A = A.replace ("abc", "XYZ"); Replace, replace the first value in parentheses with the second one, replace all, and the data type needs to be redefined;A = A.remove (5); Delete, remove all the characters from the 5 position;There can also be two values in parentheses, for example: (3,2); Remove 2 from 3 positions;Math class:Double m = 3.456;x = Math.Round (x); Roundedx = Math.Round (x

Math.ceil (): Value up such as: Math.ceil (2.1)--Result 3Math.ceil (-2.1)--result is-2Conclusion: positive into negative houseMath.floor (): Take the value in first:Math.ceil (2.1)--Results of 2Math.ceil (-2.1)--result is-3Conclusion: Contrary to the ceil () conclusion. Positive Negative entryMath.Round: RoundingMath. round (2.1)--Results of 2Math. round (2.6)--Results of 3Math. round (-2.1)--result is-2Math. round (-2.6)--result is-3Special attention:　　Math