measurement book

Measurement of Complexity AlgorithmComplexity is the amount of computer resources required for algorithm operation. The amount of time resources required is called time complexity, and the amount of space (I .e. memory) resources required is called space complexity. This quantity should reflect the efficiency of the methods used in the algorithm, and abstract them from the actual computer that runs the algorithm. In other words, this amount depends o

the high level input200uAaround. To summarize: The normal isPM1To enterPM2, first of all, confirm youroptionthe compilation macro set thepower_savingThen in the code, you need to performOsal_pwrmgr_device (pwrmgr_battery);And there's the current.200uAYes, what? To enterPm3, need you notOsalthe timer is running. See our sample routines for more details. Attachment routines Power on the radio101, current500uA, usingamobletool.apkafter the connection, the current is less than10mAAt this time, it h

/ Wkiol1xjrc2cbkd7aaj_ooogrcu259.jpg "border=" 0 "/>In the DX9 test, the FPS is almost 15-20 frames or so (playing a bit of a lag):650) this.width=650; "height=" 378 "title=" image "style=" margin:0px;border:0px;padding-top:0px;padding-right:0px; Padding-left:0px;background-image:none; "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/71/40/ Wkiom1xjq8-q9a0paaqgvqi11jm709.jpg "border=" 0 "/>650) this.width=650; "height=" 376 "title=" image "style=" margin:0px;border:0px;padding-top:0px;padding-

1 /*********************************2 code function: Pulse Width measurement3 using functions:4 Pulsein (PIN number, pulse response level, maximum response time (microseconds));5 creation time: 2016*10*086 Author Email: [Email protected]7 ********************************/8 intKeypin =2;9 voidSetup ()Ten { One Pinmode (keypin,input); ASerial.begin (9600); - } - voidLoop () the { -UnsignedLongDuration = Pulsein (Keypin,high,60000000); - serial.println (duration); -} Pulse Width

Some customers of the intelligent home lighting system, the realization of the use of mobile phone control RGB LED, wireless, intelligent, situational intelligent lighting control system, according to different scenarios set the light color and intensity adjustment.The gateway part uses the Wiznet series Ethernet chip to realize the network connection.The current smart Home suite solution to achieve the goal: Plug and Play, without any configuration, unlimited expansion, no need to worry about

brightness of the merger).The Sampler tool has a maximum of 4, and the color information is displayed in the Information palette 〖f8〗. You can use the Sampler tool to move an existing sampling point. If you switch to another tool, the sample point markers in the screen will not be visible, but the information palette still displays.You can change the sampling size option in the public bar. The sampling point represents the color of the pixel at the sampling point. The 3x3 mean and 5x5 averages

no desktop but a command line.The above download is the Ubuntu 12.04 image file to be installed, then we install also need to install the script, that is said Ubuntu.sh, as well as the installation of the startup script bootscript.sh. With these files after we in the phone's SD card root directory, a new folder named Ubuntu, and then put here we just downloaded the file into this folder, into the Ubuntu folder there are ubuntu.img, ubuntu.sh, Bootcript.sh these three files.Http://www.linuxidc.c

The infrared Thermal Imaging camera is used to obtain the infrared thermal image by using the infrared radiation Energy distribution pattern of the IR detector and the optical objective lens to receive the measured target. This thermal image corresponds to the Thermal distribution field on the surface of the object. In layman's view, the infrared camera is the invisible infrared energy emitted from an object into a visible thermal image. The different colors above the thermal image represent th

In my previous blog "Application of bootchart tool in Android system boot measurement", I had a Summary of the problem, which was more than a year ago. I finally gave three examples. the download link of The py file cannot be found. In addition, the problem occurred in python2.7. Later, I reinstalled the system and found that the Python version built in ubuntu10.04 is 2.6. It is estimated that the Python version in my system has been upgraded to 2.7.

();Traverse output per linePrintWriter PFP = new PrintWriter (file);For (object[] rowdata:rows) {StringBuffer thisline = new StringBuffer ("");for (int i = 0; i Object obj = rowdata[i]; Current FieldFormatting dataString field = "";if (null! = obj) {if (obj.getclass () = = String.class) {//If it is a stringfield = (String) obj;}} else {field = ""; Give a space placeholder when null}Stitching all fields with one row of data, using the TAB key to separateif (I Thisline.append (field);} else {//is

Mahout is a commonly used similarity measurement based on Recommendation Systems, classification, and clustering algorithms: PearsoncorrelationsimilarityPearson distance EuclideandistancesimilarityEuclidean distance CosinemeasuresimilarityCosine distance (0.7ChangedUncenteredcosinesimilarity) SpearmancorrelationsimilarityThe Pearson distance after sorting. TanimotocoefficientsimilarityGrain correlation coefficient, based on Boolean prefer

Here are the units of measurement supportedAndroid: (1) Px --> pixels-corresponds to actual pixels on the screen. (2) In --> inches-based on the physical size of the screen. (3) Mm --> millimeters-based on the physical size of the screen. (4) Pt --> points-1/72 of an inch based on the physical size of the screen. (5) DP --> density-independent pixels-an abstract unit that is based on the physical density of the screen. these units are relati

Sometimes work is not finished because of the difficulty. I will not have a technical point.Sometimes it's because of metrics. Do something over and over again.That is, quantitative change can produce qualitative change.Let's hope so.Remember the agile development of the time, QA greatly said, the work to eliminate the difficulty, and converted into only the workload, no work difficult. What he meant was that it would be good to estimate the time. At that time, feel really difficult, how can bec

timeval junction is as follows:Struct timeval {Time_t TV _sec;/* seconds */Suseconds_t TV _usec;/* microseconds */}; So it can be accurate to microseconds. Test:# Include # Include # Include IntMain (){Int I = 10000000;Struct timeval TVs, TVE;Gettimeofday ( TVs, null );While (-- I );Gettimeofday ( TVE, null );Double span = TVE. TV _sec-tvs. TV _sec + (TVE. TV _usec-tvs. TV _usec)/1000000.0;Printf ("Time: %. 12f", span );Return 0;} GCC test5.c./A. OutTime: 0.041239000000 5) Comparison of four t

Test environment: centos 6.4 x86_64-bit vmwarevm 1g RAM (physical host CPU i7-3770 3.4 GHz) Test code (using the OpenSSL hash Library ): #include Compile: G ++-O Sha. cpp-lssl-lcrypto Run:./Sha Result: MD5:1409193206140919322822SHA256:1409193228140919326335SHA512:1409193263140919331855 10 million hash operations were performed respectively. MD5 took 22 seconds, sha256 took 35 seconds, and sha512 took 55 seconds. The operation time is basically at the same magnitude. It is necessary to use sha25

articles, check whether their content is similar. Using relative entropy, we can obtain a most important concept in information retrieval: TF-IDF. Information entropy is a measure of uncertainty. Therefore, it can directly measure the quality of the statistical language model. We should use conditional entropy because of context. If there is a deviation between the probability function obtained from the training corpus and the text of the actual application, the relative entropy will be introdu

Image similarity measurement [Reprint] Original Source: http://blog.sina.com.cn/s/blog_4a540be60100vjae.html Image similarity calculation is mainly used to rate the degree of similarity between the two images. The similarity between the two images is determined based on the scores. It can be used to obtain the target position in the detection and tracking in computer vision, and locate the closest area in the image according to the existing template.

In development, you often encounter the need to get control size after activity initialization is complete.However, this operation cannot be called in the OnCreate, Onresume, and other life cycle methods because we do not know when the view will be initialized to completeTo this end, a summary of the four implementation methods1, activity/view#onwindowfocuschanged This method is the listener focus pity Dorado, but in many cases it may be called multiple times and needs to be handled appropriate

=0 VStep=1Timestep=1def __init__(self,delaytime=0.2,v0=1.0,vt=-0.1,vs=0.01,ts=0.1,vr=4): 146 Self=instrument ("gpib::1") Self.delay=delaytime Self. Vrangeselect=Vr Self. Vstart=V0 Self. Vstop=Vt Self. VStep=Vs Self. Timestep=Ts Self.write ("C") Self.write ("RP1") Self.write ("PM2") Self.write ("v%s"%str (self. vrangeselect)) cmd="SP"+str (self. Timestep) +"SN"+str (self. Vstart) +","+str (self. Vstop) +","+str (self. VStep) +"ST0"self.write (cmd) Points=abs (self. Vstop-self. Vstart)/(self. VSte

.(2) Response-The maximum wait time for the response message.3. WebSocket Request(1) implementation– only supports RFC6455 (V13), the latest version of the WebSocket protocol standard.(2) protocol– has WS and WSS, the WS prefix is the distinguished identity of the WebSocket connection, and the WSS prefix is the distinguished identity of the WebSocket secure connection. Fill in according to your actual situation(3) Streaming connection– Select this TCP session to maintain, if the hook on the iden