mtbf calculation

); while (Math.Abs objectfunction (bestx,besty) –objectfunction (PREBESTX, prebesty)) > Tolerance); Console.WriteLine ("Minimum value at point: {0},{1}", Bestx, Besty); Console.WriteLine ("min: {0}", Objectfunction (Bestx, besty)); } } } L Results: Minimum value at point: -1.07678129318956,1.07669421564618 The minimum value is:-2.26401670947686 L PostScript: Originally wanted to write a series of articles, how to use C # to solve numerical problems, this is because there a

Recently wrote a few about the "project-subitem-task" management system, said the system is still a little exaggerated, basically is a multi-table query call and INSERT, update database operation, but there are a lot of computational and statistical problems, making SQL appear complex. Therefore, it is necessary in a phase after the completion of the task, do a summary, some of the test process of SQL code to summarize, in case later use and forget, but also welcome you db yards together spit gr

Tags: sum date have mem user span order by with rankBecause MySQL does not have a good support analysis function, now take the sum analysis function as an example, to do a MySQL calculation of the daily cumulative value MySQL Cumulative calculationSelectDateID Tran_dt, Regi_ch regi_ch, Tran_ch tran_ch, Ifnull (DRAW_CT,0) draw_ct, round (Ifnull (Draw_amt,0),2) Draw_amt, All_draw_ct, round (All_draw_amt,2) All_draw_amt from(SelectD.dateid, D.regi_ch reg

is obtained by sum ()Mysql> select SUM (age) from Stuinfo;Get averageMysql> Select AVG (age) from Stuinfo; All of these are group by ... that serve in groups ...Group calculation of total number of male and female studentsMysql> Select Sex,count (*) from stuinfo GROUP by sex;+------+----------+| sex | COUNT (*) |+------+----------+| Male | 3 || Women | 3 |+------+----------+ Having is used in conjunction with group by, and then adding group condition

1. Calculation of transmission time related to baud rate of bits per secondOne frame of data includes: 1 Starting Bits: 8 bits of data; 1 mark Bits; 1 Stop bits; Total 11bits; Existing three frames of data to be sent so there is 3*11bits sent; 1bits Transmit time = 1000/600 (Bit/ms) Time to send three frames = 3 * one * (1000/600) ms = 55MS; 2, about the baud rate 9600 bits per second involved in the transfer time

 calculation of MCS, modulation order, encoding rate, spectral efficiency relationship table Reference URL: http://4g-lte-world.blogspot.tw/2012/12/transport-block-size-code-rate-protocol.html Reference URL: http://blog.richliu.com/2013/10/22/1545/ (1) Premises: Therefore, the efficiency can be simplified to the following formula: tbs= size of the transfer block (table 7.1.7.2.1-1) crc= the number of bits that are attached for error checking =24

Tags: condition time () times Start sel from diff BirtMySQL age calculation (based on birthday field)Year (From_days (DateDiff (now (), birthdate))//Get Age now () current time, accurate to seconds DateDiff (begindate,enddate): Returns the number of days related to the date between two dates. From_days (days): Starting from 0000-00-00, returns a date based on the number of dates passed in; Year (date): Gets the years of the date[Condition Search age

PS: This blog post is written using Windows Live Writer 2012, and the format effect may not be good. In my development process, I encountered a statistical requirement, and the result was a request to return the number of days from the day that the definition input was calculated For this I have written a table-valued function to address this requirement. Now it is recorded and I hope to help some friends who have encountered such problems. First we look at the execution: Returns dat

A strange problem arises in the calculation of the date:If the current date is February 29 of a leap year, then for the current date + N years, then the corresponding date becomes February 28. But this does not accord with our common sense, according to common sense, when only 28 days, time should be postponed one day, become March 1.For example, the following SQL band is used to calculate this year's birthday date:SelectName,birthday,now (), Date_add

Label:ALTER FUNCTION [dbo]. [Getage] (@birthday DATETIME)RETURNS NVARCHAR (20)AsBEGINDECLARE @startDatetime DATETIMESET @startDatetime = @birthdayIF (@birthday is not NULLand ISDATE (@birthday) = 1)BEGINDECLARE @age NVARCHAR (20),@y INT,@m INT,@d INT,@now DATETIMESET @now = GETDATE ()SET @y = DATEDIFF (month, @birthday, GETDATE ())/12--set @m = DATEDIFF (month, @birthday, GETDATE ()) --Calculation monthSET @startDatetime = DATEADD (year,DATEDIFF (D, @

Label:days of difference between #两日期/time:to_days (end_time)-to_days (start_time)number of seconds between #两日期/time:SELECT Unix_timestamp (end_time)-Unix_timestamp (start_time);Time difference between #两日期/time score:SELECT sec_to_time (Unix_timestamp (end_time)-Unix_timestamp (start_time));The best way is to directly use the "+", "-" calculation, the current version is supported. For example: SELECT * FROM table_name WHERE Logindate Instance: Sele

usually means that the IO device is experiencing a bottleneck. As we all know, the process of sleep state does not need the CPU, even if all the CPU is idle, the process of sleep is not running, so the number of sleep process is definitely not suitable for measuring CPU load, Linux put uninterruptible The sleep process's calculation of load average directly overturns the original meaning of load average. So on the Linux system, the load average this

Real NumberAlso knownFloating Point Number. Floating PointThe decimal point is not fixed.Number of pointsThat is, the decimal point is fixed. IntegerIt can be seen asA special number of points, that is, the decimal point is at the end.. AverageFloating Point NumberA bit like scientific notation, including:Symbol bit,IndexAndThe ending part. In C #, there are three types of real-time variables: float, double, and decimal. Decimal has two important points:First, decimal is still a flo

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

DirectoryThe first basic theory articleChapter 1 Overview of construction guide Closure designChapter 2 Basic Hydraulic calculation2.1 Critical Depth Calculation2.2 Normal water depth calculation2.3 Weir Flow Force calculation2.4 Calculation of flow force in open channel2.5 hydraulic calculation of pipe flow3rd Chapter hydraulic Calculation of construction dive

as followsThe concept of dielectric constant (DK)The electrical capacity of CX with the presence of a dielectric between the capacitor plates is the permittivity of the same shape and size of the vacuum capacitance co:ε= cx/co =ε '-ε 'The concept of Prepreg/corePP is a medium material, composed of glass fiber and epoxy resin, core is actually the type of PP media, but he is covered with copper foil on both sides, and PP did not.calculation of characteristic impedance of transmission lineFirst,

Cost = product cost + period cost Product cost calculation includesDirect Material fee, Direct labor costsAndManufacturing fee.WhileManufacturing feeByIndirect variable manufacturing fee(Such as fuel and machine boring) andIndirect fixed manufacturing fee(Directly related to production, such as wages and office repair fees. The period fee is the cost of the company's management. Their results are as follows: I. Various Cost

The priority of the selector is related to the style applied by the element. The specification (http://www.w3.org/TR/2009/CR-CSS2-20090908/cascade.html#specificity) in CSS2.1 is described as follows: Connect the four numbers in a-B-c-d (in a numeric system with a large number) to form the priority of the selector. In the latest Selector Level 3 specification:Connect the three numbers in a-B-c (in a numeric system with a large number) to form the priority of the selector. For details about style

Algorithm training expression calculation time limit: 1.0s memory limit: 256.0MB Problem Description Enter a valid expression that contains only the plus and minus and parentheses, to find the value of the Expression. where except for the integer Division. Enter a line in the format that contains an Expression. The output format outputs the value of this Expression. Sample input 1-2+3* (4-5) sample output-4 data size and contract expression length not

in a report project, data calculation methods for some reports change frequently. For example, the real wages of an enterprise employee are calculated by the performance score, the algorithm changes frequently, and the old algorithm needs to be replaced with the new algorithm without altering the other code. If the computation is implemented in Java, it is possible to implement dynamic hook-up calculation m