编译原理龙书答案完整性高第二章2.2ExercisesforSection2.22.2.1Considerthecontext-freegrammar:S-＞SS+|SS*|aShowhowthestringaa+a*canbegeneratedbythisgrammar.Constructaparsetreeforthisstring.Whatlanguagedoesthisgrammargenerate?Justifyyouranswer.answerS-＞SS*-＞SS+S*-＞aS+S*-＞aa+S*-＞aa+a*L={Postfixexpressionconsistingofdigits,plusandmultiplesigns}2.2.2Whatlanguageisgeneratedbythefollowinggrammars?Ineachcasejustifyyouranswer.S-＞0S1|01S-＞+SS|-SS|aS-＞S(S)S|εS-＞aSbS|bSaS|ε⧗S-＞a|S+S|SS|S*|(S)answerL={0n1n|n＞=1}L={Prefixexpressionconsistingofplusandminussigns}L={Matchedbracketsofarbitraryarrangementandnesting,includesε}L={Stringhasthesameamountofaandb,includesε}？2.2.3WhichofthegrammarsinExercise2.2.2areambiguousanswerNoNoYesYesYes2.2.4Constructunambiguouscontext-freegrammarsforeachofthefollowinglanguages.Ineachcaseshowthatyourgrammariscorrect.Arithmeticexpressionsinpostfixnotation.Left-associativelistsofidentifiersseparatedbycommas.Right-associativelistsofidentifiersseparatedbycommas.Arithmeticexpressionsofintegersandidentifierswiththefourbinaryoperators+,-,*,/.answer1.E-＞EEop|num2.list-＞list,id|id3.list-＞id,list|id4.expr-＞expr+term|expr-term|termterm-＞term*factor|term/factor|factorfactor-＞id|num|(expr)5.expr-＞expr+term|expr-term|termterm-＞term*unary|term/unary|unaryunary-＞+factor|-factorfactor-＞id|num|(expr)2.2.5Showthatallbinarystringsgeneratedbythefollowinggrammarhavevaluesdivisibleby3.Hint.Useinductiononthenumberofnodesinaparsetree.num-＞11|1001|num0|numnumDoesthegrammargenerateallbinarystringswithvaluesdivisibleby3?answerproveanystringderivedfromthegrammarcanbeconsideredtobeasequenceconsistingof11,1001and0,andnotprefixedwith0.thesumofthisstringis:sum=Σn(21+20)*2n+Σm(23+20)*2m=Σn3*2n+Σm9*2mItisobviouslycandivisibleby3.No.Considerstring"10101",itisdivisibleby3,butcannotderivedfromthegrammar.Question:anygeneralprove?2.2.6Constructacontext-freegrammarforromannumerals.Note:wejustconsiderasubsetofromannumeralswhichislessthan4k.answerwikipedia:Roman_numeralsviawikipedia,wecancategorizethesinglenomannumeralsinto4groups:I,II,III|IV|V,VI,VII,VIII|IXthengettheproduction:digit-＞smallDigit|IV|VsmallDigit|IXsmallDigit-＞I|II|III|εandwecanfindasimplewaytomapromantoarabicnumerals.Forexample:XII=＞X,II=＞10+2=＞12CXCIX=＞C,XC,IX=＞100+90+9=＞199MDCCCLXXX=＞M,DCCC,LXXX=＞1000+800+80=＞1880viatheuppertworules,wecanderivetheproduction:romanNum-＞thousandhundredtendigitthousand-＞M|MM|MMM|εhundred-＞smallHundred|CD|DsmallHundred|CMsmallHundred-＞C|CC|CCC|εten-＞smallTen|XL|LsmallTen|XCsmallTen-＞X|XX|XXX|εdigit-＞smallDigit|IV|VsmallDigit|IXsmallDigit-＞I|II|III|ε2.3ExercisesforSection2.32.3.1Constructasyntax-directedtranslationschemethattranslatesarithmeticexpressionsfrominfixnotationintoprefixnotationinwhichanoperatorappearsbeforeitsoperands;e.g.,-xyistheprefixnotationforx-y.Giveannotatedparsetreesfortheinputs9-5+2and9-5*2.。
answerproductions:expr-＞expr+term|expr-term|termterm-＞term*factor|term/factor|factorfactor-＞digit|(expr)translationschemes:expr-＞{print("+")}expr+term|{print("-")}expr-term|termterm-＞{print("*")}term*factor|{print("/")}term/factor|factorfactor-＞digit{print(digit)}|(expr)2.3.2Constructasyntax-directedtranslationschemethattranslatesarithmeticexpressionsfrompostfixnotationintoinfixnotation.Giveannotatedparsetreesfortheinputs95-2*and952*-.answerproductions:expr-＞exprexpr+|exprexpr-|exprexpr*|exprexpr/|digittranslationschemes:expr-＞expr{print("+")}expr+|expr{print("-")}expr-|{print("(")}expr{print(")*(")}expr{print(")")}*|{print("(")}expr{print(")/(")}expr{print(")")}/|digit{print(digit)}AnotherreferenceanswerE-＞{print("(")}E{print(op)}E{print(")"}}op|digit{print(digit)}2.3.3Constructasyntax-directedtranslationschemethattranslatesintegersintoromannumeralsanswerassistantfunction:repeat(sign,times)//repeat('a',2)='aa'translationschemes:num-＞thousandhundredtendigit{num.roman=thousand.roman||hundred.roman||ten.roman||digit.roman;print(num.roman)}thousand-＞low{thousand.roman=repeat('M',low.v)}hundred-＞low{hundred.roman=repeat('C',low.v)}|4{hundred.roman='CD'}|high{hundred.roman='D'||repeat('X',high.v-5)}|9{hundred.roman='CM'}ten-＞low{ten.roman=repeat('X',low.v)}|4{ten.roman='XL'}|high{ten.roman='L'||repeat('X',high.v-5)}|9{ten.roman='XC'}digit-＞low{digit.roman=repeat('I',low.v)}|4{digit.roman='IV'}|high{digit.roman='V'||repeat('I',high.v-5)}|9{digit.roman='IX'}low-＞0{low.v=0}|1{low.v=1}|2{low.v=2}|3{low.v=3}high-＞5{high.v=5}|6{high.v=6}|7{high.v=7}|8{high.v=8}2.3.4Constructasyntax-directedtranslationschemethattranslatesromannumeralsintointegers.answerproductions:romanNum-＞thousandhundredtendigitthousand-＞M|MM|MMM|εhundred-＞smallHundred|CD|DsmallHundred|CMsmallHundred-＞C|CC|CCC|εten-＞smallTen|XL|LsmallTen|XCsmallTen-＞X|XX|XXX|εdigit-＞smallDigit|IV|VsmallDigit|IXsmallDigit-＞I|II|III|εtranslationschemes:romanNum-＞thousandhundredtendigit{romanNum.v=thousand.v||hundred.v||ten.v||digit.v;print(romanNun.v)}thousand-＞M{thousand.v=1}|MM{thousand.v=2}|MMM{thousand.v=3}|ε{thousand.v=0}hundred-＞smallHundred{hundred.v=smallHundred.v}|CD{hundred.v=smallHundred.v}|DsmallHundred{hundred.v=5+smallHundred.v}|CM{hundred.v=9}smallHundred-＞C{smallHundred.v=1}|CC{smallHundred.v=2}|CCC{smallHundred.v=3}|ε{hundred.v=0}ten-＞smallTen{ten.v=smallTen.v}|XL{ten.v=4}|LsmallTen{ten.v=5+smallTen.v}|XC{ten.v=9}smallTen-＞X{smallTen.v=1}|XX{smallTen.v=2}|XXX{smallTen.v=3}|ε{smallTen.v=0}digit-＞smallDigit{digit.v=smallDigit.v}|IV{digit.v=4}|VsmallDigit{digit.v=5+smallDigit.v}|IX{digit.v=9}smallDigit-＞I{smallDigit.v=1}|II{smallDigit.v=2}|III{smallDigit.v=3}|ε{smallDigit.v=0}2.3.5Constructasyntax-directedtranslationschemethattranslatespostfixarithmeticexpressionsintoequivalentprefixarithmeticexpressions.answerproduction:expr-＞exprexprop|digittranslationscheme:expr-＞{print(op)}exprexprop|digit{print(digit)}ExercisesforSection2.42.4.1Constructrecursive-descentparsers,startingwiththefollowinggrammars:S-＞+SS|-SS|aS-＞S(S)S|εS-＞0S1|01Answer1）S-＞+SS|-SS|avoidS(){switch(lookahead){case"+":match("+");S();S();break;case"-":match("-");S();S();break;case"a":match("a");break;default:thrownewSyntaxException();}}voidmatch(Terminalt){if(lookahead=t){lookahead=nextTerminal();}else{thrownewSyntaxException()}}2）S-＞S(S)S|εvoidS(){if(lookahead=="("){S();match("(");S();match(")");S();}}3）S-＞0S1|01voidS(){switch(lookahead){case"0":match("0");S();match("1");break;case"1"://match(epsilon);break;default:thrownewSyntaxException();}}ExercisesforSection2.62.6.1ExtendthelexicalanalyzerinSection2.6.5toremovecomments,definedasfollows:Acommentbeginswith//andincludesallcharactersuntiltheendofthatline.Acommentbeginswith/*andincludesallcharactersthroughthenextoccurrenceofthecharactersequence*/.2.6.2ExtendthelexicalanalyzerinSection2.6.5torecognizetherelationaloperators.2.6.3ExtendthelexicalanalyzerinSection2.6.5torecognizefloatingpointnumberssuchas2.,3.14,and.5.AnswerSourcecode:commit8dd1a9aCodesnippet(src/lexer/Lexer.java)：publicTokenscan()throwsIOException,SyntaxException{for(;;peek=(char)stream.read()){if(peek==''||peek=='\t'){continue;}elseif(peek=='\n'){line=line+1;}else{break;}}//handlecommentif(peek=='/'){peek=(char)stream.read();if(peek=='/'){//singlelinecommentfor(;;peek=(char)stream.read()){if(peek=='\n'){break;}}}elseif(peek=='*'){//blockcommentcharprevPeek='';for(;;prevPeek=peek,peek=(char)stream.read()){if(prevPeek=='*'&&peek=='/'){break;}}}else{thrownewSyntaxException();}}//handlerelationsignif("".indexOf(peek)＞-1){StringBufferb=newStringBuffer();b.append(peek);peek=(char)stream.read();if(peek=='='){b.append(peek);}returnnewRel(b.toString());}//handlenumber,notypesensitiveif(Character.isDigit(peek)||peek=='.'){BooleanisDotExist=false;StringBufferb=newStringBuffer();do{if(peek=='.'){isDotExist=true;}b.append(peek);peek=(char)stream.read();}while(isDotExist==true?Character.isDigit(peek):Character.isDigit(peek)||peek=='.');returnnewNum(newFloat(b.toString()));}//handlewordif(Character.isLetter(peek)){StringBufferb=newStringBuffer();do{b.append(peek);peek=(char)stream.read();}while(Character.isLetterOrDigit(peek));Strings=b.toString();Wordw=words.get(s);if(w==null){w=newWord(Tag.ID,s);words.put(s,w);}returnw;}Tokent=newToken(peek);peek='';returnt;}ExercisesforSection2.82.8.1For-statementsinCandJavahavetheform:for(exprl;expr2;expr3)stmtThefirstexpressionisexecutedbeforetheloop;itistypicallyusedforinitializingtheloopindex.Thesecondexpressionisatestmadebeforeeachiterationoftheloop;theloopisexitediftheexpressionbecomesO.Theloopitselfcanbethoughtofasthestatement{stmtexpr3;}.Thethirdexpressionisexecutedattheendofeachiteration;itistypicallyusedtoincrementtheloopindex.Themeaningofthefor-statementissimilartoexpr1;while(expr2){stmtexpr3;}DefineaclassForforfor-statements,similartoclassIfinFig.2.43.AnswerclassForextendsStmt{ExprE1;ExprE2;ExprE3;StmtS;publicFor(Exprexpr1,Exprexpr2,Exprexpr3,Stmtstmt){E1=expr1;E2=expr2;E3=expr3;S=stmt;}publicvoidgen(){E1.gen();Labelstart=newLable();Lalelend=newLable();emit("ifFalse"+E2.rvalue().toString()+"goto"+end);S.gen();E3.gen();emit("goto"+start);emit(end+":")}}2.8.2TheprogramminglanguageCdoesnothaveabooleantype.ShowhowaCcompilermighttranslateanif-statementintothree-addresscode.AnswerReplaceemit("isFalse"+E.rvalue().toString()+"goto"+after);withemit("ifNotEqual"+E.rvalue().toString()+"0goto"+after);oremit("isNotEqualZero"+E.rvalue().toString()+"goto"+after);
answerproductions:expr-＞expr+term|expr-term|termterm-＞term*factor|term/factor|factorfactor-＞digit|(expr)translationschemes:expr-＞{print("+")}expr+term|{print("-")}expr-term|termterm-＞{print("*")}term*factor|{print("/")}term/factor|factorfactor-＞digit{print(digit)}|(expr)2.3.2Constructasyntax-directedtranslationschemethattranslatesarithmeticexpressionsfrompostfixnotationintoinfixnotation.Giveannotatedparsetreesfortheinputs95-2*and952*-.answerproductions:expr-＞exprexpr+|exprexpr-|exprexpr*|exprexpr/|digittranslationschemes:expr-＞expr{print("+")}expr+|expr{print("-")}expr-|{print("(")}expr{print(")*(")}expr{print(")")}*|{print("(")}expr{print(")/(")}expr{print(")")}/|digit{print(digit)}AnotherreferenceanswerE-＞{print("(")}E{print(op)}E{print(")"}}op|digit{print(digit)}2.3.3Constructasyntax-directedtranslationschemethattranslatesintegersintoromannumeralsanswerassistantfunction:repeat(sign,times)//repeat('a',2)='aa'translationschemes:num-＞thousandhundredtendigit{num.roman=thousand.roman||hundred.roman||ten.roman||digit.roman;print(num.roman)}thousand-＞low{thousand.roman=repeat('M',low.v)}hundred-＞low{hundred.roman=repeat('C',low.v)}|4{hundred.roman='CD'}|high{hundred.roman='D'||repeat('X',high.v-5)}|9{hundred.roman='CM'}ten-＞low{ten.roman=repeat('X',low.v)}|4{ten.roman='XL'}|high{ten.roman='L'||repeat('X',high.v-5)}|9{ten.roman='XC'}digit-＞low{digit.roman=repeat('I',low.v)}|4{digit.roman='IV'}|high{digit.roman='V'||repeat('I',high.v-5)}|9{digit.roman='IX'}low-＞0{low.v=0}|1{low.v=1}|2{low.v=2}|3{low.v=3}high-＞5{high.v=5}|6{high.v=6}|7{high.v=7}|8{high.v=8}2.3.4Constructasyntax-directedtranslationschemethattranslatesromannumeralsintointegers.answerproductions:romanNum-＞thousandhundredtendigitthousand-＞M|MM|MMM|εhundred-＞smallHundred|CD|DsmallHundred|CMsmallHundred-＞C|CC|CCC|εten-＞smallTen|XL|LsmallTen|XCsmallTen-＞X|XX|XXX|εdigit-＞smallDigit|IV|VsmallDigit|IXsmallDigit-＞I|II|III|εtranslationschemes:romanNum-＞thousandhundredtendigit{romanNum.v=thousand.v||hundred.v||ten.v||digit.v;print(romanNun.v)}thousand-＞M{thousand.v=1}|MM{thousand.v=2}|MMM{thousand.v=3}|ε{thousand.v=0}hundred-＞smallHundred{hundred.v=smallHundred.v}|CD{hundred.v=smallHundred.v}|DsmallHundred{hundred.v=5+smallHundred.v}|CM{hundred.v=9}smallHundred-＞C{smallHundred.v=1}|CC{smallHundred.v=2}|CCC{smallHundred.v=3}|ε{hundred.v=0}ten-＞smallTen{ten.v=smallTen.v}|XL{ten.v=4}|LsmallTen{ten.v=5+smallTen.v}|XC{ten.v=9}smallTen-＞X{smallTen.v=1}|XX{smallTen.v=2}|XXX{smallTen.v=3}|ε{smallTen.v=0}digit-＞smallDigit{digit.v=smallDigit.v}|IV{digit.v=4}|VsmallDigit{digit.v=5+smallDigit.v}|IX{digit.v=9}smallDigit-＞I{smallDigit.v=1}|II{smallDigit.v=2}|III{smallDigit.v=3}|ε{smallDigit.v=0}2.3.5Constructasyntax-directedtranslationschemethattranslatespostfixarithmeticexpressionsintoequivalentprefixarithmeticexpressions.answerproduction:expr-＞exprexprop|digittranslationscheme:expr-＞{print(op)}exprexprop|digit{print(digit)}ExercisesforSection2.42.4.1Constructrecursive-descentparsers,startingwiththefollowinggrammars:S-＞+SS|-SS|aS-＞S(S)S|εS-＞0S1|01Answer1）S-＞+SS|-SS|avoidS(){switch(lookahead){case"+":match("+");S();S();break;case"-":match("-");S();S();break;case"a":match("a");break;default:thrownewSyntaxException();}}voidmatch(Terminalt){if(lookahead=t){lookahead=nextTerminal();}else{thrownewSyntaxException()}}2）S-＞S(S)S|εvoidS(){if(lookahead=="("){S();match("(");S();match(")");S();}}3）S-＞0S1|01voidS(){switch(lookahead){case"0":match("0");S();match("1");break;case"1"://match(epsilon);break;default:thrownewSyntaxException();}}ExercisesforSection2.62.6.1ExtendthelexicalanalyzerinSection2.6.5toremovecomments,definedasfollows:Acommentbeginswith//andincludesallcharactersuntiltheendofthatline.Acommentbeginswith/*andincludesallcharactersthroughthenextoccurrenceofthecharactersequence*/.2.6.2ExtendthelexicalanalyzerinSection2.6.5torecognizetherelationaloperators.2.6.3ExtendthelexicalanalyzerinSection2.6.5torecognizefloatingpointnumberssuchas2.,3.14,and.5.AnswerSourcecode:commit8dd1a9aCodesnippet(src/lexer/Lexer.java)：publicTokenscan()throwsIOException,SyntaxException{for(;;peek=(char)stream.read()){if(peek==''||peek=='\t'){continue;}elseif(peek=='\n'){line=line+1;}else{break;}}//handlecommentif(peek=='/'){peek=(char)stream.read();if(peek=='/'){//singlelinecommentfor(;;peek=(char)stream.read()){if(peek=='\n'){break;}}}elseif(peek=='*'){//blockcommentcharprevPeek='';for(;;prevPeek=peek,peek=(char)stream.read()){if(prevPeek=='*'&&peek=='/'){break;}}}else{thrownewSyntaxException();}}//handlerelationsignif("".indexOf(peek)＞-1){StringBufferb=newStringBuffer();b.append(peek);peek=(char)stream.read();if(peek=='='){b.append(peek);}returnnewRel(b.toString());}//handlenumber,notypesensitiveif(Character.isDigit(peek)||peek=='.'){BooleanisDotExist=false;StringBufferb=newStringBuffer();do{if(peek=='.'){isDotExist=true;}b.append(peek);peek=(char)stream.read();}while(isDotExist==true?Character.isDigit(peek):Character.isDigit(peek)||peek=='.');returnnewNum(newFloat(b.toString()));}//handlewordif(Character.isLetter(peek)){StringBufferb=newStringBuffer();do{b.append(peek);peek=(char)stream.read();}while(Character.isLetterOrDigit(peek));Strings=b.toString();Wordw=words.get(s);if(w==null){w=newWord(Tag.ID,s);words.put(s,w);}returnw;}Tokent=newToken(peek);peek='';returnt;}ExercisesforSection2.82.8.1For-statementsinCandJavahavetheform:for(exprl;expr2;expr3)stmtThefirstexpressionisexecutedbeforetheloop;itistypicallyusedforinitializingtheloopindex.Thesecondexpressionisatestmadebeforeeachiterationoftheloop;theloopisexitediftheexpressionbecomesO.Theloopitselfcanbethoughtofasthestatement{stmtexpr3;}.Thethirdexpressionisexecutedattheendofeachiteration;itistypicallyusedtoincrementtheloopindex.Themeaningofthefor-statementissimilartoexpr1;while(expr2){stmtexpr3;}DefineaclassForforfor-statements,similartoclassIfinFig.2.43.AnswerclassForextendsStmt{ExprE1;ExprE2;ExprE3;StmtS;publicFor(Exprexpr1,Exprexpr2,Exprexpr3,Stmtstmt){E1=expr1;E2=expr2;E3=expr3;S=stmt;}publicvoidgen(){E1.gen();Labelstart=newLable();Lalelend=newLable();emit("ifFalse"+E2.rvalue().toString()+"goto"+end);S.gen();E3.gen();emit("goto"+start);emit(end+":")}}2.8.2TheprogramminglanguageCdoesnothaveabooleantype.ShowhowaCcompilermighttranslateanif-statementintothree-addresscode.AnswerReplaceemit("isFalse"+E.rvalue().toString()+"goto"+after);withemit("ifNotEqual"+E.rvalue().toString()+"0goto"+after);oremit("isNotEqualZero"+E.rvalue().toString()+"goto"+after);
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【文档说明】本文是自己整理的一些重点知识点，也是面试中会被问到的知识点【文档结构】决策树信息熵（Entropy）什么是决策树决策树的构建过程决策树分割属性选择决策树量化纯度决策树量化纯度信息增益率计算方式决策树的停止条件决策树算法效果评估决策树生成算法ID3算法ID３算法优缺点C4.5算法8CART算法8ID3\C4.5\CART分类回归树算法总结分类树和回归树的区别决策树优化策略决策树的剪枝决策树剪枝过程附录：
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绝地求生：易语言全套加速器源码【更新日期：2018年1月10日】使用说明：用FTP将后台文件用二进制上传到网站根目录后安装网站安装好后登陆后台添加产品然后把激活码输入都源码里，产品ID，通信秘钥在后台添加产品后获取，并输入然后搜索HTTP把所有HTTP网址改成自己的域名即可后台设置公告（重要）不设置会导致软件无法启动格式为公告内容||网址添加游戏：在M文件夹中route就是存放游戏路由表的地方打开1||英雄联盟||http://域名/m/route/yxlm.txt||http://域名/m/route/1.png||0序号||游戏名称||游戏路由表地址||游戏LOGO地址||后面的0代表国内游戏，1则为国外游戏路由表格式参考：add1.207.140.0mask255.255.255.0IPMETRICdefaultIFIFZadd14.17.12.0mask255.255.255.0IPMETRICdefaultIFIFZadd14.17.13.0mask255.255.255.0IPMETRICdefaultIFIFZadd14.17.14.0mask255.255.255.0IPMETRICdefaultIFIFZ线路添加：网游加速的线路分别存放在这两个文件里面国内跟国外，格式为线路名称||IP||用户名||密码网络加速则存放在编写好节点文档后，采用附赠的加密工具加密后上传到网站根目录即可充值系统注：后台必须把充值卡位数改成10位以内，太多字符会导致充值出错！1.首先打开注册个账号http://www.1ka123.com/dashboard/index2.打开雷盾的后台获取客户ID3.地址高级=》在线售卡4.这里写上客户ID然后点编辑刷新5.获取提卡数据6.在易卡上面找到商品/分类的商品列表点编辑7.平台对接写雷盾对接密匙写提卡数据然后点保存这样子就可以实现无卡的时候自动补卡了软件对接：打开源码目录下的扫码支付模块按下列格式写入你的卡类信息比如我这里增加月卡修改完即可收款实现自动充值
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用python编写的决策树ID3算法，运用了Car-Evaluation的例子。
BUG较少，综合了网上的优秀代码，并进一步形成自己的代码。
代码基本有注释，风格良好，能够很快看懂。
内含有比较规范的报告文档，包含所有流程图，说明图，以及文档风格绝对不错，无需更改，建议下载！该算法所测试的数据集如下（已经打包在内，并已经生成xls格式，方便直接使用）：已知：UCI标准数据集Car-Evaluation，定义了汽车性价比的4个类别；
求：用ID3算法建立Car-Evaluation的属性描述决策树Car-Evaluation训练数据集文件：1.car_databases.pdf2.car_evalution-databases.pdf
BUG较少，综合了网上的优秀代码，并进一步形成自己的代码。
代码基本有注释，风格良好，能够很快看懂。
内含有比较规范的报告文档，包含所有流程图，说明图，以及文档风格绝对不错，无需更改，建议下载！该算法所测试的数据集如下（已经打包在内，并已经生成xls格式，方便直接使用）：已知：UCI标准数据集Car-Evaluation，定义了汽车性价比的4个类别；
求：用ID3算法建立Car-Evaluation的属性描述决策树Car-Evaluation训练数据集文件：1.car_databases.pdf2.car_evalution-databases.pdf
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决策树ID3算法matlab源代码片段function[TreeRulesMatrix]=DecisionTree(DataSet,AttributName)%输入为训练集，为离散后的数字，如记录1：11321；
%前面为属性列，最后一列为类标ifnargin＜1error('请输入数据集');elseifisstr(DataSet)[DataSetAttributValue]=readdata2(DataSet);elseAttributValue=[];end
%前面为属性列，最后一列为类标ifnargin＜1error('请输入数据集');elseifisstr(DataSet)[DataSetAttributValue]=readdata2(DataSet);elseAttributValue=[];end
2024/9/13 9:14:03
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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。
2024-04-09 15:03
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