liquefaction calculation

) Tag Selector "such as: h1", pseudo-elements "such as:: after" number (=C) Ignore "*" Selector Although pseudo-classes (such as: hover) participate in the calculation of CSS precedence, ":not" does not participate in calculations. The precedence within the HTML style attribute is described in CSS2.1 (it does not directly participate in the calculation of the priority in the browser implemen

//JS calculation two time difference //StartDate: Start time, EndDate: End Time (time format: 2018-5-18 11:51:40 string) functionCALDATEDIFFFN (StartDate, endDate) {//the number of milliseconds for the time difference varMillsecsdiff =NewDate (endDate). GetTime ()-NewDate (startdate). GetTime (); //calculate the difference in days varDaysdiff = Math.floor (Millsecsdiff/(24 * 3600 * 1000)); //calculate the number of hours var

The double type and float type are primarily designed for use in scientific and engineering calculations and are used for binary floating-point calculations. For the general calculation is usually inaccurate results, so for the ordinary floating-point addition and subtraction, the solution needs to use Int,long,bigdecimal to calculate. 1. Calculate the problem?The calculation results are as follows:Obviousl

PHP date formatting and date calculation as well as when getting previous week, month tail datePHP date formatting Sample code: /** * Format time * $type: Type * $strDate: Time string to process * * Year y: four-digit year y: two-bit year * Month M: two-digit month N: one digit month Part M: English month * Date D: Two digit date J: one digit Date D: English date *: H, min: I, SEC: s **/public Function getformatdate ($type = 1, $strDat E=

Turn from: http://www.cnblogs.com/haoyul/p/6910679.html For a long time did not write code, recently took the calculation of triangular mesh surface Gauss curvature practiced practicing, and realized the Gaussian curvature visualization, reviewed a little differential geometry knowledge. Feel sometimes still want to write the code, debugging and running, combined with the test results, in order to have a deeper understanding of the corresponding know

Calculating the time difference in PHP is sometimes a hassle! However, I believe that any language, as long as the grip of the regulation rate can find a way, is absolutely rotten to the magic. Work often to carry out the date calculation, the following summary of several work summed up the experience. Make a note lest you forget it later! 1. First calculation time period difference (can be minutes, seconds

Ken_len represents the number of bytes used by the index, based on this value, it is possible to determine the index usage, especially when combining indexes, to determine whether all the indexed fields are queried.Key_len shows the index length required by the conditional retrieval clause, but the index used by the ORDER by and the GROUP by clause does not count toward the key_len statistic value;About the calculation rules for Key_len:• When the ind

definition of time complexity in general, the number of times the basic operation is repeated in the algorithm is a function of the problem size n, denoted by T (n), if there is an auxiliary function f (n), So that when n approaches infinity, the limit value of T (n)/f (n) is a constant that is not equal to zero, then f (n) is the same order of magnitude function of T (N). As T (n) =o (f (n)), called O (f (n)) is the progressive time complexity of the algorithm (O is the order of magnitude )

Label:BackgroundIn the MySQL master and standby environment, the main standby synchronization process is as follows, the main library update generates Binlog, the standby IO line pulls take the main library binlog generate relay log. The standby SQL thread executes the relay log to maintain synchronization with the main library. In theory, when the main library is updated, there is a delay in the standby, and the delay time is the standby execution time + network transmission time is t4-t2. So

Yesterday, bitcoin.org in charge of Cobra issued an open letter angry godless bit continent, require Bitcoin users to modify the POW algorithm, using Pow+pos hybrid system, and select those convenient to build Asics algorithm.Then, the bit Continental CEO Wu Bogey Cold in the Twitter response said "too cool." When you do this, Bitcoin's share in the cryptocurrency market will probably fall below 10%. Good luck! ”。In the open letter, Cobra expressed the following views:1. Bitcoin's central featur

The similarity calculation method of short text can be divided into two kinds: The method based on deep learning and the method based on non-deep learning. Scientific research is basically from the depth of learning, but the individual think to the single language of the short text similarity calculation to make flowers more difficult, relatively based on deep learning cross-language similarity

model language model for regression modelIRModel Inference Network Model Trust degree network modelIn addition there is a statistical-based machine learning sequencing algorithm.This paper mainly introduces Boolean model, vector space model, probabilistic model, language model, machine learning sorting algorithm.3. Boolean modelBoolean model:Is the simplest information retrieval model, which is a simple retrieval model based on set theory and Boolean algebra.Basic idea:Documents and User querie

I have been thinking about how to calculate the accessibility of the national scale recently. Accessibility, usually defined as the degree of accessibility that a place can reach from another place. Some are also called accessibility and accessibility. However, it is clear that the concept of accessibility is more appropriate to study the concept of accessibility within a city on a regional scale or even a national scale. The accessible degree calculation