how to calculate downtime

1>>> A=mat ([[1],[2],[3]]);2>>> B=mat ([[0],[2],[3]]);3>>>a4Matrix ([[1],5[2],6[3]])7>>>b8 Matrix ([[0],9[2],Ten[3]]) One>>> a.t*b AMatrix ([[13]])The above is calculated for the inner product of two column vectors, noting the construction of the column vectors a=mat ([[1],[2],[3]]);The following is a calculation of the inner product of two line vectors, and the construction of the line vectors is A=mat ([[three]]);1 >>> A=mat ([[[+]]); 2 >>> b=mat ([[0,2,3]]); 3 >>> a4 matrix ([[[1, 2, 3]])5 >>

#first, mathematical functions are introducedImportMath#create a class of pointsclassPoint ():#the coordinates of the initialization point (x, y) def __init__(self,x=0,y=0): self.x=x self.y=y#gets the x-axis coordinates of a point defGetX (self):returnself.x#get the y-coordinate of a point defGetY (self):returnSelf.y#define a class of linesclassLine ():#two points of the initialization line def __init__(SELF,P1,P2): self.x= P1.getx ()-p2.getx () self.y= P1.gety ()-p2.gety ()#Pythagor

Import Java.util.Scanner;public class Weightofbmi {public static void Main (string[] args) {Scanner input = new Scanner (system.in);System.out.println ("Enter a number for weight:");Double weight = input.nextdouble ();System.out.println ("Enter a number for height:");Double height = input.nextdouble ();Final double kilograms_per_pound=0.45359237;Final double meters_per_inch=0.0254;Double Weightinkilogram = weightkilograms_per_pound;Double heightinmeters = heightmeters_per_inch;Double BMI = weigh

The Linux system uses time to calculate when the command executesWhen testing a program or comparing different algorithms, the execution time is very important, and a good algorithm should be the shortest. All UNIX-like systems are included time命令 , using this command to count time consumption. For example:[[Email protected] ~]# time lsanaconda-ks.cfg install.log install.log.syslog satools textreal 0m0.009suser 0m0.002ssys 0m0.007sThe ou

var olddate = ' 2017/02/07 00:00:00 '; setinterval (function () { var activedate = new Date (); var diffdate = Activedate.gettime ()-New Date (olddate). GetTime (); ----------------------- var days = Math.floor (diffdate/(24*3600*1000)); var leave1 = diffdate% (24*3600*1000); var hours = Math.floor (leave1/(3600*1000)); var leave2 = leave1% (3600*1000); var minutes = Math.floor

1.forEach Traversal:functionsum (arr) { var result = 0;Arr.foreach (function+ = item;}); return result;};2.reducefunction sum (arr) { return arr.reduce (function(pre,cur) { return pre+ cur; })}3. Evalfunction sum (arr) { return eval (arr.join ("+"));}[1,2,3,4].join (' + ')//"1+2+3+4"eval ("1+2+3+4"); // Ten4. General circulationfunction sum (arr) { var result= 0; var len=Arr.length; for (var i=0;i+ = Arr[i]; } return result;Several ways to

in C language, there is a library dedicated to the functions of system time, program timing, etc.namely Time.hThe function clock_t clock (void) in time.h can complete the timing function.This function returns the number of CPU clock ticks (clock ticks) from "Open this program process" to "call clock () function in program", called Wall Clock Time (Wal-clock) in MSDN. Where clock_t is the data type used to hold the time, in the Time.h file, we can find the definition of it:#ifndef _clock_t_define

#include Calculate the number of words in a string using the C language implementation

When an electronic compass, such as a hmc5883l or MPU9250, AK8963 the azimuth, it is often found that the angular jitter of the measurement is severe. Even though it does not move, the angle changes in a small range. At this time, we need to use the gyroscope to compensate the azimuth angle and fusion, and obtain the stable data. This paper only discusses the azimuth of 2D space, which is the z-axis data of the electronic Compass X, y two-axis data fusion gyroscope.1. Electronic compass and gyro

Method/Step Click the right mouse button to view the video file properties to learn the size of the video file and how long the video is playing If the video file is 250MB, the playback length is 30min, then we can calculate the video code rate by formula: Video rate = (video file size *8)/time, where the rate of video is (Kbps), video file size in KB, unit of time is S, So we can get a video size of 1111kbps The video's sharpness and the video's r

Steps to calculate age in Excel Open the Excell table you want to edit, and select the "Age" line. Click the right mouse button to select format Cells. Select "Value" in the number option, and then click "OK" after "Number of decimal digits" to "0". Click the cell "C2" and enter "= (today ()-b2)/365". Click the "tick" option or press "enter" Then select C2 this cell, when the cross arro

This article is a way to calculate the length of the message for Sina Weibo. Yes (please follow the Community Convention and enter 119 words). Copy Code code as follows: var getmessagelength = (function () { var bytelength = function (b) { if (typeof B = "undefined") { return 0; } var a = B.match (/[^x00-x80]/g); return (B.length + (!a? 0:a.length)); }; return function (message) { message = Message | | ''; message = Message.replac

word2013 Calculate table data steps as follows: word2013 sum operation: Step One: Move the cursor to the cell where the result is placed. Step Two: Click the formulas option in the data group on the Layout tab. Step three: In the Formula dialog box that pops up, the "Sum above data" command (SUM (ABOVE)) is the default. If this is not the command, enter the command after "=", or click the SUM option on the Paste Function me

A calculator, please. Although Word2007 provides a "calculation" tool but it seems to be a little shy to see people's taste because of its simplicity of function. So, the calculator, hidden, if you want to use it first, the method is as follows Right-click the Quick Access Toolbar, and then click from the shortcut menu to customize the Quick Access Toolbar (figure) In, select the command from the following location, click in the box, not in the ribbon, and then, in the list of commands belo

For express statistics, because each express arrival location is different, so the charges will not be the same, this period introduces a quick way to help express statisticians use Excel quick statistics all over the postage 1, first look at the effect 2, the first to create a secondary column, known as the regional costs, we use VLOOKUP to quote the area, the formula, if you do not understand the VLOOKUP function, you can see the previous experience 3, th

People who have used an IFRAME know that it is a template, there is an IFRAME, and in the IFRAME, can be nested multiple pages. (The more common problem is that the IFRAME page, often appears when the content display is not full).Remember, by JS to calculate the height, the most important thing is that all the elements wrapped in the inside of the elements, that is, the height of the body, the height of the other elements are present, generally as lon

= (C1 + C2 * T) * cos (theta) (3.16-type) The Calcearthlongitudenutation () function is the implementation code that calculates the Huang motion: Double calcearthlongitudenutation (double dt) { double T = dt *; Double D,m,mp,f,omega; Getearthnutationparameter (DT, d, m, MP, f, omega); Double resulte = 0.0; for (int i = 0; i The Getearthnutationparameter () auxiliary functio

This example describes how PHP uses inverse polish to calculate wages. Share to everyone for your reference. Specifically as follows: The general algorithm for converting an ordinary middle-order expression to an inverse Polish expression is: First you need to allocate 2 stacks, a stack S1 (with a closing symbol) as a temporary storage operator, a stack S2 (empty stack) as an input inverse polish, and the S1 stack can first be placed at the lowest p

CAD2014 is a lot of users in the use of a mapping software, so, there are netizens asked: cad2014 How to calculate the area. In today's use of the tutorial, we will be together to understand the cad2014 area of the basic method, hope to help everyone! Query Q cad2014 method of calculating area: 1, open cad2014, in the menu bar, click "Tools"; 2, pull out tool options, with the mouse pointing to "Query Q", activate the query command, su

Explain:1.awk ' nf{a++;p rint a,$0;next}1 ' file4First of all, the existence of the value of NF, the first row of the second row of the third row of the fourth row is present, the output after execution, after the output hit next, the end of the operation, NF does not exist the row does not carry out the operation {}, then the default 1 output.2.awk ' Nf{a++;$0=a "" $0}1 ' file4NF exists, the operation {}, the operation is to replace the original $0=a value of $0=1 A, the number of times after t