《MATLAB及其工程应用》第5讲

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1、MATLAB&ItsApplicationsInEngineering李清都副教授liqd@cqupt.edu.cnLect.5:BranchStatementContentsCovered:Top-downdesignTechniquesrelational&logicaloperatorsBranchstatements:‘if-elseif-else-end’,‘switch-case-otherwise-end’Objectives:UnderstandtheconceptsofTop-downdesignflowfirm

2、lygrasptheusageofrelational&logicaloperatorsFirmlygrasptheusageof‘if-elseif-else-end’,‘switchcaseotherwiseend’StrengthentheskillonwritinganddebuggingM-fileTop-downDesignFlowMorecomplicatedcontrolstatementsTosolvecomplicatedproblems,youhavetowritemorecomplicatedprograms

3、.branching&loopingRelationaloperators==~=><>=<=1)nottoconfusethe‘==‘with‘=‘2)relationaloperatorshaslowerhierarchythanarithmeticoperationsGoodProgrammingpracticeAlwaysuseparenthesestoindicatetheorder7+3<2+11(7+3)<(2+11)Whatistheresult?a=0;b=sin(pi);c=(a==b);Logicalopera

4、tors&

5、xor~HierarchyofoperationsArithmeticoperatorsRelationaloperators(fromlefttoright)~&

6、!Logicalfunctionsisequal()isempty()isinf()isnan()isnumeric()Theifconstructifexpression_1statement_1elseifexpression_2statement_2elsestatement_3endExampleusingifconstructscore=input

7、(‘pleaseinputyourscore:‘);ifscore>=90grade=‘Excellent’;elseifscore>=70grade=‘Good’;elseifscore>=60;grade=‘Passed’;elsegrade=‘Failed’;enddisp(grade);Theswitchconstructswitch(swtich_expression)casecase_expr_1statement_1casecase_expr_2statement_2otherwisestatement_3endExa

8、mpleusingswitchconstructpassword=input(‘pleaseinputyourpassword:‘);switchpasswordcase‘matlab’privilege=‘WRITE_ONLY’;case‘pld’privilege=‘READ_ONLY’;otherwiseprivilege=‘FORBIDDEN’;endAssignment:Excises3.2,3.3,3.4,3.5