BeyondSpreadsheetswithRshowsyouhowtotakerawdataandtransformitforuseincomputations,tables,graphs,andmore.You’llbuildonsimpleprogrammingtechniqueslikeloopsandconditionalstocreateyourowncustomfunctions.You’llcomeawaywithatoolkitofstrategiesforanalyzingandvisualizingdataofallsortsusingRandRStudio.Spreadsheetsarepowerfultoolsformanytasks,butifyouneedtointerpret,interrogate,andpresentdata,theycanfeellikethewrongtoolsforthetask.That’swhenRprogrammingisthewaytogo.TheRprogramminglanguageprovidesacomfortableenvironmenttoproperlyhandlealltypesofdata.AndwithintheopensourceRStudiodevelopmentsuite,youhaveatyourfingertipseasy-to-usewaystosimplifycomplexmanipulationsandcreatereproducibleprocessesforanalysisandreporting.WithBeyondSpreadsheetswithRyou’lllearnhowtogofromrawdatatomeaningfulinsightsusingRandRStudio.Eachcarefullycraftedchaptercoversauniquewaytowrangledata,fromunderstandingindividualvaluestointeractingwithcomplexcollectionsofdata,includingdatayouscrapefromtheweb.You’llbuildonsimpleprogrammingtechniqueslikeloopsandconditionalstocreateyourowncustomfunctions.You’llcomeawaywithatoolkitofstrategiesforanalyzingandvisualizingdataofallsorts.What’sinsideHowtostartprogrammingwithRandRStudioUnderstandingandimplementingimportantRstructuresandoperatorsInstallingandworkingwithRpackagesTidying,refining,andplottingyourdata

ElectromagneticFieldTheoryFundamentals2nded-B.Guru,H.Hiziroglu本书简明易懂，贴近读者，深受广大师生欢迎。
　　本书包含许多实例、问题、章末小结和适当的背景材料。
书中首先介绍静电磁场和静磁场的基本概念，继而讲解麦克斯韦尔方程、电磁传播、电磁传输和电磁辐射。
另外，还增加了关于有限元法和有限差分法的章节以及关于史密斯圆图的详细附录。
　　1ELECTROMAGNETICFIELDTHEORY1.1Introduction1.2FieldConcept1.3VectorAnalysis1.4DifferentialandIntegralFormulations1.5StaticFields1.6Time-VaryingFields1.7ApplicationsofTime-VaryingFields1.8NumericalSolutions1.9FurtherStudy2VECTORANALYSIS2.1Introduction2.2ScalarandVectorQuantities2.3VectorOperations2.4TheCoordinateSystems2.5ScalarandVectorFields2.6DifferentialElementsofLength,Surface,andVolume2.7Line,Surface,andVolumeIntegrals2.8TheGradientofaScalarFunction2.9DivergenceofaVectorField2.10TheCurlofaVectorField2.11TheLaplacianOperator2.12SomeTheoremsandFieldClassifications2.13VectorIdentities2.14Summary2.15ReviewQuestions2.16Problems3ELECTROSTATICS3.1Introduction3.2Coulomb’sLaw3.3ElectricFieldIntensity3.4ElectricFluxandElectricFluxDensity3.5TheEIectricPotential3.6ElectricDipole3.7MaterialsinanElectricField3.8EnergyStoredinanEIectricField3.9BoundaryConditions3.10CapacitorandCapacitance3.11Poisson’sandLaplace’sEquations3.12MethodofImages3.13Summary3.14ReviewQuestions3.15Problems4STEADYELECTRICCURRENTS4.1Introduction4.2NatureofCurrentandCurrentDensity4.3ResistanceofaConductor4.4TheEquationOfContinuity4.SRelaxationTime4.6Joule’sLaw4.7SteadyCurrentinaDiode4.8BoundaryConditionsforCurrentDensity4.9AnalogyBetweenDandJ4.10TheElectromotiveForce4.11Summary4.12ReviewQuestions4.13Problems1ELECTROMAGNETICFIELDTHEORY1.1Introduction1.2FieldConcept1.3VectorAnalysis1.4DifferentialandIntegralFormulations1.5StaticFields1.6Time-VaryingFields1.7ApplicationsofTime-VaryingF

一个算术表达式是由操作数(operand)、运算符(operator)和界限符(delimiter)组成的。
结束符是为了方便。
编程利用“算符优先法”求算术表达式的值,该资源是数据结构的一个作业。
（1）从键盘或文件读入一个合法的算术表达式，输出正确的结果。
（2）显示输入序列和栈的变化过程。

《快学Scala》英文第二版：ScalafortheImpatientSecondEditionCayS.Horstmann目录：1THEBASICSA111.1TheScalaInterpreter11.2DeclaringValuesandVariables41.3Co妹妹onlyUsedTypes51.4ArithmeticandOperatorOverloading61.5MoreaboutCallingMethods81.6TheapplyMethod91.7Scaladoc10Exercises152CONTROLSTRUCTURESANDFUNCTIONSA1172.1ConditionalExpressions182.2StatementTermination192.3BlockExpressionsandAssignments20viiContents2.4InputandOutput212.5Loops222.6AdvancedforLoops242.7Functions252.8DefaultandNamedArgumentsL1262.9VariableArgumentsL1262.10Procedures282.11LazyValuesL1282.12Exceptions29Exercises313WORKINGWITHARRAYSA1353.1Fixed-LengthArrays353.2Variable-LengthArrays:ArrayBuffers363.3TraversingArraysandArrayBuffers373.4TransformingArrays383.5Co妹妹onAlgorithms403.6DecipheringScaladoc413.7MultidimensionalArrays423.8InteroperatingwithJava43Exercises444MAPSANDTUPLESA1474.1ConstructingaMap484.2AccessingMapValues484.3UpdatingMapValues494.4IteratingoverMaps504.5SortedMaps504.6InteroperatingwithJava504.7Tuples514.8Zipping52Exercises52viiiContents5CLASSESA1555.1SimpleClassesandParameterlessMethods555.2PropertieswithGettersandSetters565.3PropertieswithOnlyGetters595.4Object-PrivateFields605.5BeanPropertiesL1615.6AuxiliaryConstructors625.7ThePrimaryConstructor635.8NestedClassesL166Exercises686OBJECTSA1716.1Singletons716.2CompanionObjects726.3ObjectsExtendingaClassorTrait736.4TheapplyMethod736.5ApplicationObjects746.6Enumerations75Exercises777PACKAGESANDIMPORTSA1797.1Packages807.2ScopeRules817.3ChainedPackageClauses837.4Top-of-FileNotation837.5PackageObjects837.6PackageVisibility847.7Imports857.8ImportsCanBeAnywhere857.9RenamingandHidingMembers867.10ImplicitImports86Exercises87ixContents8INHERITANCEA1918.1ExtendingaClass918.2OverridingMethods928.3TypeChecksandCasts938.4ProtectedFieldsandMethods948.5SuperclassConstruction948.6OverridingFields958.7AnonymousSubclasses978.8AbstractClasses978.9AbstractFields978.10ConstructionOrderandEarlyDefinitionsL3988.11TheScalaInheritanceHierarchy1008.12ObjectEqualityL11028.13ValueClassesL2103Exercises1059FILESANDREGULAREXPRESSIONSA11099.1ReadingLines1099.2ReadingCharacters1109.3ReadingTokensandNumbers1119.4ReadingfromURLsandOtherSources1119.5ReadingBinaryFiles1129.6WritingTextFiles1129.7VisitingDirectories1129.8Serialization1139.9ProcessControlA21149.10RegularExpressions1169.11RegularExpressionGroups117Exercises11810TRAITSL112110.1WhyNoMultipleInheritance?12110.2TraitsasInterfaces12310.3TraitswithConcreteImplementations124xContents10.4ObjectswithTraits12510.5LayeredTraits12510.6OverridingAbstractMethodsinTraits12710.7TraitsforRichInterfaces12710.8ConcreteFieldsinTraits12810.9AbstractFieldsinTraits13010.10TraitConstructionOrder13010.11InitializingTraitFields13210.12TraitsExtendingClasses13310.13SelfTypesL213410.14WhatHappensundertheHood135Exercises13711OPERATORSL114111.1Identifiers14211.2InfixOperators14311.3UnaryOperators14311.4AssignmentOperators14411.5Precedence14411.6Associativity14511.7TheapplyandupdateMethods14611.8ExtractorsL214711.9ExtractorswithOneorNoArgumentsL214911.10TheunapplySeqMethodL214911.11DynamicInvocationL2150Exercises15312HIGHER-ORDERFUNCTIONSL115712.1FunctionsasValues15712.2AnonymousFunctions15912.3FunctionswithFunctionParameters16012.4ParameterInference16012.5UsefulHigher-OrderFunctions16112.6Closures162xiContents12.7SAMConversions16312.8Currying16412.9ControlAbstractions16612.10ThereturnExpression167Exercises16813COLLECTIONSA217113.1TheMainCollectionsTraits17213.2MutableandI妹妹utableCollections17313.3Sequences17413.4Lists17513.5Sets17713.6OperatorsforAddingorRemovingElements17813.7Co妹妹onMethods18013.8MappingaFunction18213.9Reducing,Folding,andScanningA318413.10Zipping18713.11Iterators18813.12StreamsA318913.13LazyViewsA319013.14InteroperabilitywithJavaCollections19113.15ParallelCollections193Exercises19414PATTERNMATCHINGANDCASECLASSESA219714.1ABetterSwitch19814.2Guards19914.3VariablesinPatterns19914.4TypePatterns20014.5MatchingArrays,Lists,andTuples20114.6Extractors20214.7PatternsinVariableDeclarations20314.8PatternsinforExpressions20414.9CaseClasses205xiiContents14.10ThecopyMethodandNamedParameters20514.11InfixNotationincaseClauses20614.12MatchingNestedStructures20714.13AreCaseClassesEvil?20814.14SealedClasses20914.15SimulatingEnumerations20914.16TheOptionType21014.17PartialFunctionsL2211Exercises21215ANNOTATIONSA221515.1WhatAreAnnotations?21615.2WhatCanBeAnnotated?21615.3AnnotationArguments21715.4AnnotationImplementations21815.5AnnotationsforJavaFeatures21915.5.1JavaModifiers21915.5.2MarkerInterfaces22015.5.3CheckedExceptions22015.5.4VariableArguments22115.5.5JavaBeans22115.6AnnotationsforOptimizations22215.6.1TailRecursion22215.6.2JumpTableGenerationandInlining22315.6.3ElidingMethods22415.6.4SpecializationforPrimitiveTypes22515.7AnnotationsforErrorsandWarnings226Exercises22716XMLPROCESSINGA222916.1XMLLiterals23016.2XMLNodes23016.3ElementAttributes23216.4EmbeddedExpressions233xiiiContents16.5ExpressionsinAttributes23416.6Unco妹妹onNodeTypes23516.7XPath-likeExpressions23516.8PatternMatching23716.9ModifyingElementsandAttributes23816.10TransformingXML23916.11LoadingandSaving23916.12Namespaces242Exercises24317FUTURESA224717.1RunningTasksintheFuture24817.2WaitingforResults25017.3TheTryClass25117.4Callbacks25117.5ComposingFutureTasks25217.6OtherFutureTransformations25517.7MethodsintheFutureObject25617.8Promises25817.9ExecutionContexts260Exercises26018TYPEPARAMETERSL226518.1GenericClasses26618.2GenericFunctions26618.3BoundsforTypeVariables26618.4ViewBounds26818.5ContextBounds26818.6TheClassTagContextBound26918.7MultipleBounds26918.8TypeConstraintsL326918.9Variance27118.10Co-andContravariantPositions272xivContents18.11ObjectsCan’tBeGeneric27418.12Wildcards275Exercises27519ADVANCEDTYPESL227919.1SingletonTypes28019.2TypeProjections28119.3Paths28219.4TypeAliases28319.5StructuralTypes28319.6CompoundTypes28419.7InfixTypes28519.8ExistentialTypes28619.9TheScalaTypeSystem28719.10SelfTypes28819.11DependencyInjection28919.12AbstractTypesL329119.13FamilyPolymorphismL329319.14Higher-KindedTypesL3296Exercises29920PARSINGA330320.1Gra妹妹ars30420.2CombiningParserOperations30520.3TransformingParserResults30720.4DiscardingTokens30820.5GeneratingParseTrees30920.6AvoidingLeftRecursion31020.7MoreCombinators31120.8AvoidingBacktracking31420.9PackratParsers31420.10WhatExactlyAreParsers?31520.11RegexParsers316Contentsxv20.12Token-BasedParsers31720.13ErrorHandling319Exercises32021IMPLICITSL332321.1ImplicitConversions32421.2UsingImplicitsforEnrichingExistingClasses32421.3ImportingImplicits32521.4RulesforImplicitConversions32621.5ImplicitParameters32821.6ImplicitConversionswithImplicitParameters32921.7ContextBounds32921.8TypeClasses33121.9Evidence33321.10The@implicitNotFoundAnnotation33421.11CanBuildFromDemystified334Exercises336Index338

一、CMCCAdmin用户登录web页面，密码是aDm8H%MdA二、掀开http://192.168.1.1/upgrade.cgi降级写入3FE46872AFIA89三、重启后192.168.1.1/cu.html用CMCCAdmin的用户名密码登录四、开启telnet：http://192.168.1.1/system.cgi?telnet#n#五、telnet里换成电信ritoolsetOperatorIDSXSAcfgcli-rreboot六、进去后删除了tr069，F12大法七、电信、cef、brldr密码telecomadminnE7jA%5m

BookDescriptionWrittenforthemoderatelyexperiencedJavaprogra妹妹er,thisbookbuildsonreaders¿existingknowledgeofobject-orientedprogra妹妹ingandcoversallimportantaspectsofStandardC++—emphasizingmorelower-levelC-styledetailslaterinthepresentation.ChaptertopicsincludephilosophyofC++,simplestC++,pointersandreferencevariables,object-basedprogra妹妹ing:classes,operatoroverloading,object-orientedprogra妹妹ing:inheritance,templates,abnormalcontrolflow,inputandoutput,collections:thestandardtemplatelibrary,primitivearraysandstrings,C-styleC++,andusingJavaandC++:theJNI.FornewC++progra妹妹ersconvertedfromJava.ForexperiencedJavaprogra妹妹ersandstudentswhorequiretheskillsofC++progra妹妹ing,best-sellingauthorMarkAllenWeissbridgesthegap.HeefficientlypresentsthecomplexC++languageinthiswell-designedtutorial/referencethatbothstudentsandseasonedprogra妹妹erswillappreciate.ThebookisidealasaprimarytextforintermediateC++courses,asasupplementalno-nonsensereferenceforothercourses,orforindependentlearningbyprofessionals.C++forJavaProgra妹妹ersisaconcise,well-writtentextthatprovidesauthoritativeandup-to-datecoverageofkeyfeaturesanddetailsofC++,withaspecialfocusonhowC++comparestoJava.Thebook'sapproachshowsknowledgeablestudentsorprofessionalshowtograspthecomplexitiesofC++andharnessitspowerbymutuallyaddressingthebenefitsandthepitfallsofthetwolanguages.Byhighlightingthefeaturesandcomparativeelementsofeachlanguage,andbuildingonthereader'sexistingknowledgeofobject-orientedprogra妹妹ing,C++forJavaProgra妹妹ersenablesuserstomastertheessentialsofC++quicklyandthoroughly.KeyFeaturesIncludesinsightfulcomparisonsofthetwoprogra妹妹inglanguagesthroughoutthetextandpointsoutthesubtletiesofC++SuccinctlycoversthepertinenthighlightsofSTL(StandardTemplateLibrary

数据库零碎概念第六版答案（包括实践习题，习题）例如3.11答案Exercises•WritethefollowingqueriesinSQL,usingtheuniversityschema.•FindthenamesofallstudentswhohavetakenatleastoneComp.Sci.course;makesuretherearenoduplicatenamesintheresult.•FindtheIDsandnamesofallstudentswhohavenottakenanycourseofferingbeforeSpring2009.11•Foreachdepartment,findthemaximumsalaryofinstructorsinthatdepartment.Youmayassumethateverydepartmenthasatleastoneinstructor.•Findthelowest,acrossalldepartments,oftheper-departmentmax-imumsalarycomputedbytheprecedingquery.Answer:•SQLquery:selectnamefromstudentnaturaljointakesnaturaljoincoursewherecourse.dept=’Comp.Sci.’•SQLquery:selectid,namefromstudentexceptselectid,namefromstudentnaturaljointakeswhereyear＜2009Sincetheexceptoperatoreliminatesduplicates,thereisnoneedtouseaselectdistinctclause,althoughdoingsowouldnotaffectcorrectnessofthequery.•SQLquery:selectdept,max(salary)frominstructorgroupbydept

ThisdocumentisthetechnicalspecificationforWi-FiCERTIFIEDPasspointTM(Release2),theWi-FiAlliancecertificationprogramthatprovidesWPA2TMhotspotnetworkaccessandonlinesignup.Passpoint(Release2)enablesasecure,automaticconnectionexperienceforusersandsupportsoperatorgoalsofleveragingWi-Fi®technologyfordataoffloadofcellularnetworks.

ApplicationofthelocalfractionalseriesexpansionmethodandthevariationaliterationmethodtotheHelmholtzequationinvolvinglocalfractionalderivativeoperators

DBOperator数据库衔接，很好用。

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。