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Engr0012(04-1)LecNotes06-01ca05review-problemsolvingProblemStatement#1:Acableoflengthl0isneededtosuspendanobjectofmassmobjfromtheceiling.Theload,T=mobjg,istheforcethatthemassexertsonthecable.Thedeflection(elongation)ofthecableundertheloadmustbelessthanlmax.Ignoringthemassofthecable(mcable,whichaddstotheload),whatcablemassisrequiredtojustsupporttheloadwithoutpermanentdeformation?step1:drawasketch!!!ceilingl0mobjT=mobjgneeds
l0mobjlmax
学分网Engr0012(04-1)LecNotes06-02step2:reviewrelevantengineeringstress-strainproblem:S=Eestressstrainelastic(Young’s)moduluspermanentdeformationwhenS>SylookingformassofcablematerialpropertylookitupaddtoneedslistneedequationforvolumeA0l0Engr0012(04-1)LecNotes06-03step2:reviewrelevantengineeringalreadyonneedslistneedequationcancalculateT=mobjgneedvalueuseSyaddtoneedslistneedslist
l0mobj
lmaxSy
Engr0012(04-1)LecNotes06-04step3:restateproblemDesignaMATLABscripttofindtheminimummassofacablerequiredtosupportanobjecthangingfromaceilinggiventhemassoftheobject,initiallengthofthecable,maximumdeflection,cabledensity,andcableyieldstress.step4:algorithm1.Askuserformassoftheobject,initiallengthofthecable,maximumdeflection,cabledensity,andcableyieldstress.2.Computemassofcable.3.Reportmassofcable.Engr0012(04-1)LecNotes06-05step5:expandstep2ofalgorithm2.Computemassofcable.a.Computetension.b.Computecablediameter.c.Computecablevolume.d.Computecablemass.Engr0012(04-1)LecNotes06-06ca05review-problemsolvingProblemStatement#2:MybossattheInternalRevenueService(IRS)hasaskedmetodevelopaprogramthatwilldeterminehowmuchtaxesareduebaseduponataxpayer’sannualsalary.Thetaxdueisbaseduponaprovidedtable.step1:drawasketch!!!Can’t-notapplicable.step2:reviewrelevantinformationNeedtofindwheresalaryfallsintable.Computetaxdueasbase+%timeamountinexcessofminimuminrangeneedslistsalaryEngr0012(04-1)LecNotes06-07step3:restateproblemDesignaMATLABscripttofindthetaxduebaseduponataxpayer’ssalary.step4:algorithm1.Askuserforsalary.2.Computetaxdue.3.Reporttaxdue.step5:expandstep2ofalgorithm2.Computetaxdue.a.Usesalaryandif/elseif/elsestructuretofindappropriaterowintableb.Computeappropriateexcess.c.Computeappropriatetaxdue.Engr0012(04-1)LecNotes06-08decisionmaking-designissuesWheneveryouneedtomakeadecision,makeadecisiontableconditionactionRainingTakeumbrellaCloudyTakehatSunnyTakesunblockandhatAdecisiontableisasimplelistingofconditionsandactionsthatresultiftheconditionismet.Engr0012(04-1)LecNotes06-09decisionmaking-designissuesTwotypesofdecisionconditionsMutuallyexclusiveconditionsConditionshavenooverlap,i.e.,onlyoneoftheconditionscanbetrueNonexclusiveconditionsConditionscanoverlap,i.e.,oneormoreoftheconditionscanbetrueatsametimeExampleNonexclusive-Why?Engr0012(04-1)LecNotes06-10decisionmaking-designissuesExampleNonexclusive-Why?Importantbecausewewilluseanif/elseifcommandstructuretofindproperconditionandactionscoreof84satisfiesconditions2,3,and4Engr0012(04-1)LecNotes06-11if/elseif/elsecommandstructureif(condition1)performcondition1actionselseif(condition2)performcondition2actionselseif(condition3)performcondition3actionselseperform“default”actionsendfirstconditonfromtablefirstconditonactionsfromtableifnoneoftheconditonsaremetperformtheseactionsdefaultisfrequentlyomittedEngr0012(04-1)LecNotes06-12decisionmaking-MATLABsyntaxExampleif(score<60)grade=‘F’;elseif(score>=60)grade=‘D’;elseif(score>=70)grade=‘C’;elseif(score>=80)grade=‘B’;elseif(score>=90)grade=‘A’;endMATLABmovesthroughstructurelookingforfirstconditionthatissatisfied.MATLABthenexecutesthe“actionstatements”underthecondition.Whenthelast“actionstatement”isfinished,MATLABgoestotheend.Engr0012(04-1)LecNotes06-13decisionmaking-nonexclusiveconditionsnonexclusiveconditionsareaproblem-caneitherrearrangetabletomakesureorderofexecutionisappropriateif(score>=90)grade=‘A’;elseif(score>=80)grade=‘B’;elseif(score>=70)grade=‘C’;elseif(score>=60)grade=‘D’;elsegrade=‘F’;endnoteuseofdefaultratherthanconditionEngr0012(04-1)LecNotes06-14decisionmaking-nonexclusiveconditionsnonexclusiveconditionsareaproblem-caneitherrearrangetabletomakesureorderofexecutionisappropriateormakeconditionsmutuallyexclusiveif(score<60)grade=‘F’;elseif(score>=60&score<70)grade=‘D’;elseif(score>=70&score<80)grade=‘C’;elseif(score>=80&score<90)grade=‘B’;elsegrade=‘A’;endOrderofexecutionofmutuallyexclusiveconditionsnotimportantb
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