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TheRlanguageiswidelyusedbystatisticiansfordataanalysis,andthepopularityofRprogramminghasthereforeincreasedsubstantiallyinrecentyears.TheemergingInternetofThings(IoT)gathersincreasingamountsofdatathatcanbeanalyzedtogainusefulinsightsintotrends.RforDataAnalysisineasystepshasaneasy-to-followstylethatwillappealtoanyonewhowantstoproducegraphicvisualizationstogaininsightsfromgathereddata.RforDataAnalysisineasystepsbeginsbyexplainingcoreprogrammingprinciplesoftheRprogramminglanguage,whichstoresdatain“vectors”fromwhichsimplegraphscanbeplotted.Next,thebookdescribeshowtocreate“matrices”tostoreandmanipulatedatafromwhichgraphscanbeplottedtoprovidebetterinsights.Thisbookthendemonstrateshowtocreate“dataframes”fromimporteddatasets,andhowtoemploythe“GrammarofGraphics”toproduceadvancedvisualizationsthatcanbestillustrateusefulinsightsfromyourdata.RforDataAnalysisineasystepscontainsseparatechaptersonthemajorfeaturesoftheRprogramminglanguage.TherearecompleteexampleprogramsthatdemonstratehowtocreateLinegraphs,Barcharts,Histograms,Scattergraphs,Boxplots,andmore.ThecodeforeachRscriptislisted,togetherwithscreenshotsthatillustratetheactualoutputwhenthatscripthasbeenexecuted.Thefree,downloadableexampleRcodeisprovidedforclearerunderstanding.BytheendofthisbookyouwillhavegainedasoundunderstandingofRprogramming,andbeabletowriteyourownscriptsthatcanbeexecutedtoproducegraphicvisualizationsfordataanalysis.Youneedhavenopreviousknowledgeofanyprogramminglanguage,soit'sidealforthenewcomertocomputerprogramming.TableofContentsChapter1GettingStartedChapter2StoringValuesChapter3PerformingOperationsChapter4TestingConditionsChapter5EmployingFunctionsChapter6BuildingMatricesChapter7Constructin

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GetstartedwithPerl5andlearntheimportantcoreconceptsofPerlprogramming,suchasvariables,flowcontrol,expressions,andI/O.Additionally,thisbookcoverspatternmatchingandshowsthatPerlisextremelyflexibleandpowerful,andthatitisn’tafraidofthecloud.Afterreadingandusingthisbook,you’llbeabletostartwritingyourownpowerfulscriptstosolvemanywebandprogrammingproblems.Thisisabookforthoseofuswhobelievedthatwedidn’tneedtolearnPerl,andnowweknowitismoreubiquitousthanever.You’llseethatPerlhasevolvedintoamultipurpose,multiplatformlanguagepresentabsolutelyeverywhere:heavy-dutywebapplications,thecloud,systemsadministration,naturallanguageprocessing,andfinancialengineering.ThisbookprovidesvaluableinsightintoPerl’sroleregardingallofthesetasksandmoregivingyouagreatstartinyourPerlprogrammingadventure.WhatYouWillLearnPerformoperationsonscalarvaluesUsescalar,array,andassociativearrayvariablesWorkwithflowcontrolstatementssuchasif,unless,while,until,for,andforeachReadandwritedirectlytofileswithfilehandlesUseconditionalexpressionssuchasnumericandstringcomparison,regularexpressions,filetesting,andPerlstatementsFormatoutputwithformatstatementsSearchforandreplacesub-stringswithinastringusingregularexpressionsMasterPerlutilitiessuchassplit,join,indexandmoreControlthefilesystemandprocessesfromwithinaPerlscriptBuildfunctionsfortasksincludinghandlingthescopeofvariablesImportexistingmodulesintoyourPerlscriptWhoThisBookIsForThosewhoarenewtoPerl.

计算机组成与设计第五版英文书+答案Webelievethatlearningincomputerscienceandengineeringshouldreflectthecurrentstateofthefield,aswellasintroducetheprinciplesthatareshapingcomputing.Wealsofeelthatreadersineveryspecialtyofcomputingneedtoappreciatetheorganizationalparadigmsthatdeterminethecapabilities,performance,energy,and,ultimately,thesuccessofcomputersystems.Moderncomputertechnologyrequiresprofessionalsofeverycomputingspecialtytounderstandbothhardwareandsoftware.Theinteractionbetweenhardwareandsoftwareatavarietyoflevelsalsooffersaframeworkforunderstandingthefundamentalsofcomputing.Whetheryourprimaryinterestishardwareorsoftware,computerscienceorelectricalengineering,thecentralideasincomputerorganizationanddesignarethesame.Thus,ouremphasisinthisbookistoshowtherelationshipbetweenhardwareandsoftwareandtofocusontheconceptsthatarethebasisforcurrentcomputers.Therecentswitchfromuniprocessortomulticoremicroprocessorsconfirmedthesoundnessofthisperspective,givensincethefirstedition.Whileprogrammerscouldignoretheadviceandrelyoncomputerarchitects,compilerwriters,andsiliconengineerstomaketheirprogramsrunfasterorbemoreenergy-efficientwithoutchange,thateraisover.Forprogramstorunfaster,theymustbecomeparallel.Whilethegoalofmanyresearchersistomakeitpossibleforprogrammerstobeunawareoftheunderlyingparallelnatureofthehardwaretheyareprogramming,itwilltakemanyyearstorealizethisvision.Ourviewisthatforatleastthenextdecade,mostprogrammersaregoingtohavetounderstandthehardware/softwareinterfaceiftheywantprogramstorunefficientlyonparallelcomputers.Theaudienceforthisbookincludesthosewithlittleexperienceinassemblylanguageorlogicdesignwhoneedtounderstandbasiccomputerorganizationaswellasreaderswithbackgroundsinassemblyl

Vigenere算法c语言的简单实现#includemain(){inti,j,m,n,c,k,Ming_length,Key_length;charvigenere_table[26][26];charKey[200],Ming[500],Mi[200],s[26][26];printf("VigenereTable:\n");for(j=0;j＜=25;j++){printf("%c\n",'a'+j);for(i=0;i＜=25;i++){vigenere_table[i][j]='A'+(i+j)%26;printf("%c",vigenere_table[i][j]);}}printf("\n");for(i=0;i＜=25;i++){printf("%c",'a'+i);}printf("\n");printf("QingshuruMingwen:\n");gets(Ming);printf("QingshuruMiyao:\n");gets(Key);Ming_length=strlen(Ming);Key_length=strlen(Key);printf("\n");k=0;printf("mingwenshi\n");do{for(j=k;j＜k+Key_length;j++){intm=Ming[j];intn=Key[j-k];printf("%c",vigenere_table[m-97][n-97]);}k+=Key_length;}while(k＜Ming_length);getch();}

TheReasonedSchemer(MITPress)(TheMITPress)By作者:DanielPFriedman–WilliamEByrd–OlegKiselyov–JasonHemannISBN-10书号:0262535513ISBN-13书号:9780262535519Edition版本:secondedition出书日期:2018-03-09pages页数:(206)Aneweditionofabook,writteninahumorousquestion-and-answerstyle,thatshowshowtoimplementanduseanelegantlittleprogramminglanguageforlogicprogramming.Thegoalofthisbookistoshowthebeautyandeleganceofrelationalprogramming,whichcapturestheessenceoflogicprogramming.ThebookshowshowtoimplementarelationalprogramminglanguageinScheme,orinanyotherfunctionallanguage,anddemonstratestheremarkableflexibilityoftheresultingrelationalprograms.Asinthefirstedition,thepedagogicalmethodisaseriesofquestionsandanswers,whichproceedwiththecharacteristichumorthatmarkedTheLittleSchemerandTheSeasonedSchemer.FamiliaritywithafunctionallanguageorwiththefirstfivechaptersofTheLittleSchemerisassumed.Forthissecondedition,theauthorshavegreatlysimplifiedtheprogramminglanguageusedinthebook,aswellastheimplementationofthelanguage.Inadditiontorevisingthetextextensively,andsimplifyingandrevisingthe“Laws”and“Commandments,”theyhaveaddedexplicit“Translation”rulestoeasetranslationofSchemefunctionsintorelations.CopyrightContentsForewordPrefaceAcknowledgementsSincetheFirstEdition1.Playthings2.Teaching01dToysNewTricks3.Seeing01dFriendsinNewWays4.DoubleYourFun5.MembersOrnly6.TheFunNeverEnds…7.ABitTooMuch8.JustaBitMore9.ThinIce10.UndertheHoodA.ConnectingtheWiresB.WelcometotheClubAfterwordIndex

在日常工作中，钉钉打卡成了我生活中不可或缺的一部分。然而，有时候这个看似简单的任务却给我带来了不少烦恼。 每天早晚，我总是得牢记打开钉钉应用，点击"工作台"，再找到"考勤打卡"进行签到。有时候因为工作忙碌，会忘记打卡，导致考勤异常，影响当月的工作评价。而且，由于我使用的是苹果手机，有时候系统更新后，钉钉的某些功能会出现异常，使得打卡变得更加麻烦。 另外，我的家人使用的是安卓手机，他们也经常抱怨钉钉打卡的繁琐。尤其是对于那些不太熟悉手机操作的长辈来说，每次打卡都是一次挑战。他们总是担心自己会操作失误，导致打卡失败。 为了解决这些烦恼，我开始思考是否可以通过编写一个全自动化脚本来实现钉钉打卡。经过一段时间的摸索和学习，我终于成功编写出了一个适用于苹果和安卓系统的钉钉打卡脚本。