MATLAB試驗(yàn)報(bào)告（8個(gè)試驗(yàn)）

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系級(jí)班年月日試驗(yàn)名稱：Intro,Expressions,Commands

姓名學(xué)號(hào)指導(dǎo)教師成績(jī)1Objective

TheobjectiveofthislabistofamiliarizeyouwiththeMATLABprogramdevelopmentenvironmentandtodevelopyourfirstprogramsinthisenvironment.

2UsingMATLAB2.1StartingMATLAB

LogontoyourcomputerandstartMATLABbydouble-clickingontheicononthedesktoporbyusingtheStartProgramsmenu.MATLABDesktopwindowwillappearonthescreen.

Thedesktopconsistsofseveralsub-windows.Themostimportantonesare:

?CommandWindow(ontherightsideoftheDesktop)isusedtodocalculations,

entervariablesandrunbuilt-inandyourownfunctions.

?Workspace(ontheupperleftside)consistsofthesetofvariables(arrays)created

duringthecurrentMATLABsessionandstoredinmemory.

?CommandHistory(onthelowerleftside)logscommandsenteredinthe

CommandWindow.Youcanusethiswindowtoviewpreviouslyrunstatements,andcopyandexecuteselectedstatements.

YoucanswitchbetweentheLaunchPadwindowandtheWorkspacewindowusingthemenutabsunderthesub-windowontheupperleftside.Similarly,youcanswitchbetweentheCommandHistoryandCurrentDirectorywindowsusingthemenutabsunderthesub-windowonthelowerleftside.

2.2ExecutingCommands

YoucantypeMATLABcommandsatthecommandprompt“>>〞ontheCommandWindow.

Forexample,youcantypetheformulacos(π/6)2sin(3π/8)as>>(cos(pi/6)^2)*(sin(3*pi/8))

Trythiscommand.Afteryoufinishtyping,pressenter.ThecommandwillbeinterpretedandtheresultwillbedisplayedontheCommandWindow.

TrythefollowingbyobservinghowtheWorkspacewindowchanges:>>a=2;(Makenoteoftheusageof“;〞)>>b=3;

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>>c=a^4?b?5+pi^3

Youcanseethevariablesa,bandcwiththeirtypesandsizesontheWorkspacewindow,andcanseethecommandsontheCommandHistorywindow.

Spendafewminutestopracticedefiningarrayvariables(i.e.vectorsandmatrices)using

thesquarebracket(“[]〞)andcolon(“:〞)operators,andzeros()andones()functions.

>>ar=[12345];>>br=[123;456];>>cr=[1:3:15];

?Setdrto?rst3elementsofar.

dr=ar(1:3);?Setertosecondrowofbr.

er=br(2,:);?Setarto[drer].Findthenumberofelementsofar.

ar=[drer];length(ar)

2.3GettingHelp

ThereareseveralwaystogethelponcommandsandfunctionsinMATLAB.FirstofallyoucanusetheHelpmenu.Youcanalsousethe“?〞button.Trytofindinformationontheplotfunctionfromthehelpindex.Alsotrytogetinformationonthesamefunctionusingthehelpcommand(i.e.typehelpplot).Finally,experimentwiththelookforcommand.Thiscommandlooksforothercommandsrelatedtoagivenkeyword.

2.4SomeUsefulCommands

Trythefollowingcommandsandobservetheirresults:Which:VersionandlocationinfoClear:Clearstheworkspace

Clc:Clearsthecommandwindow

who,whos:Listscontentoftheworkspace

3Exercises

PleasesolvethefollowingproblemsinMATLAB.Donotforgettokeepadiaryofyourcommandsandtheiroutputs.

(1)De?nethevariablesxyandzas7.6,5.5and8.1,respectively,andevaluate:

?2y?xz2???5.2x??4.785

(2)Computetheslopeofthelinethatpassesthroughthepoints(1,-2)and(5,8).(3)Quiz1.1:5

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(4)1.6Exercises:1.1,1.4

(5)2.15Exercises:2.6,2.9,2.114QuittingMATLAB

Typingquitonthecommandwindowwillclosetheprogram.DonotforgettosendyourdiaryfileandM-filetoyourTA.

Donotforgettodeleteyour?lesfromtheharddiskofthePCyouusedinthelabattheendofthelabsession.

四川師范大學(xué)MATLAB語(yǔ)言試驗(yàn)報(bào)告2

系級(jí)班年月日

試驗(yàn)名稱：Programming,RelationalandLogicalExpressions

姓名學(xué)號(hào)指導(dǎo)教師成績(jī)1Objective

TheobjectiveofthislabistofamiliarizeyouwiththeMATLABscriptfiles(M-files),subarrays,relationalandlogicaloperators.

2ScriptFiles

ScriptfilesarecollectionsofMATLABstatementsthatarestoredinafile.InsteadoftypingcommandsdirectlyintheCommandWindow,aseriesofcommandsmaybeplacedintoafileandtheentirefilemaybeexecutedbytypingitsnameintheCommandWindow.SuchfilesarecalledscriptfilesthatarealsoknownasM-filesbecausetheyhaveanextensionof.m.Whenascriptfileisexecuted,theresultisthesameasitwouldbeifallofthecommandshadbeentypeddirectlyintotheCommandWindow.AllcommandsandscriptfilesexecutedintheCommandWindowshareacommonworkspace,sotheycanallsharevariablesintheworkspace.Notethatiftwoscriptfilesareexecutedsuccessively,thesecondscriptfilecanusethevariablescreatedbythefirstscriptfile.Inthisway,scriptfilescancommunicatewithotherscriptfilesthroughthedataleftbehindintheworkspace.AnEditWindowisusedtocreatenewM-filesortomodifyexistingones.TheEditWindowisaprogrammingtexteditor,withthefeaturesofMATLABlanguagehighlightedindifferentcolors.YoucancreateanewM-filewiththeFile/New/M-fileselectionandyoucanopenanexistingM-filewiththeFile/OpenselectionfromthedesktopmenuofMATLAB.

(1)Createanewworkingdirectoryunderthecurrentdirectoryandchangethecurrentdirectoryto?TA?ssuggest?.

3Subarrays

ItispossibletoselectandusesubsetsofMATLABarrays.Toselectasubsetofanarray,justincludealistoftheelementstobeselectedintheparenthesesafterthearrayname.MATLABhasaspecialfunctionnamedendthatisusedtocreatearray

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subscripts.Theendfunctionalwaysreturnsthehighestvaluetakenonbyagivensubscript.Itisalsopossibletousesubarraysontheleft-handsideofanassignmentstatementtochangeonlysomeofthevaluesinanarray.Ifvaluesareassignedtoasubarray,onlythosevaluesarechangedbutifvaluesareassignedtoanarray,theentirecontentsofthearrayarereplacedbythenewvalues.(1)Definethefollowing5x5arrayarr1inMATLAB.

3?3?1??448?arr1??111532??16?1718??2154236124195745??10??51??20?22??

(2)WriteaMATLABstatementtoselectasubsetofarr1andreturnthesubarray

containingthevaluesasshown.

?365?arr11????547422?

arr11=arr1([1,5],[245]);

(3)WritetwoMATLABstatementstoselectthelastrowandlastcolumnofarr1,separately.

arr12=arr1(5,:);或arr12=arr1(end,:);arr13=arr1(:,end);或arr13=arr1(:,5);(4)WriteMATLABstatementstoobtainthefollowingarrayfromarr1.

?121??354???arr2???323???674????522??

arr2=arr1([15],:)';

4RelationalandLogicalOperators

Relationalandlogicaloperatorsarethetwotypesofoperatorsthatproducetrue/falseresultsinMATLABprograms.MATLABinterpretsazerovalueasfalseandanynonzerovalueastrue.Relationaloperators(==,=,>,>=,0;

(3)Writeanexpressionusingarr4andarelationaloperatortoproducethefollowingresult.

?1?0arr6???0??00100

001000010?0??0??0?

arr6=arr4==1;

(4)WriteaMATLABprogramwhichwillgeneratean(n-1)x(n-1)matrixfromagivennxnmatrixwhichwillbeequaltogivenmatrixwithfirstrowandfirstcolumndeleted.

arr44=rand(5);arr444=arr35(2:end,2:end);(5)Generalizeyourprogramabovesothattheprogramshouldasktherowandcolumnnumberstobedeletedandthengeneratenew(n-1)x(n-1)matrix.n=input('inputn:');matrixn=rand(n)

delrow=input('inputrownumberstobedeleted:');

delcolumn=input('inputcolumnnumberstobedeleted:');

matrixn_1=matrixn([1:delrow-1delrow+1:end],[1:delcolumn-1delcolumn+1:end])(6)Quiz3.1（P88）5QuittingMATLAB

Typingquitonthecommandwindowwillclosetheprogram.DonotforgettosendyourdiaryfileandM-filetoyourTA.

DonotforgettodeleteyourfilesfromtheharddiskofthePCyouusedinthelabat

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>p=find_closest(1,0,'points.txt');>>disp(p);

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>>p=find_closest(-1,4,'points.txt');>>disp(p);

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wherethefilepoints.txtcontains:-12032-21121

5QuittingMATLAB

Typingquitonthecommandwindowwillclosetheprogram.DonotforgettosendyourdiaryfileandM-filetoyourTA.

DonotforgettodeleteyourfilesfromtheharddiskofthePCyouusedinthelabattheendofthelabsession.

四川師范大學(xué)MATLAB語(yǔ)言試驗(yàn)報(bào)告7

系級(jí)班年月日

試驗(yàn)名稱：ConvolutionandFFTcomputation

姓名學(xué)號(hào)指導(dǎo)教師成績(jī)1Objective

TheobjectiveofthislabistofamiliarizeyouconvolutionandfftcomputationwiththeMATLAB

2Convolutioncomputation

TheconvfunctionofMATLABcansupportconvolutionandpolynomialmutiplicationoperation.Writeaprogramthatcomputeconvolutionbetweeninputsignalandsystemimpulseresponse.Yourprogramshouldgivethefigureofinputsignal,system,outputsignal.Exampleofinputsignalandsystemimpulseresponseis：System:h(n)??(n)?2.5?(n?1)?2.5?(n?2)??(n?3)

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Inputsignal:x(n)?2sin(?0nT)，T?0.001，0?n?50

0?0?10?Hint:stemfunctionofMATLABisusefulforplottingfigureofdiscretesignaland

system.

3SpectrumanalysisusingFFT

Writeaspectrumanalysisprogramfortwokindsofsequence.ThefftfunctionofMATLABcanbeusedforspectrumanalysisofsignal.Spectrumfigureofgivensequencemustbeconsideredinprogram.Sequenceisgivenbelow:(1)gausssequence

??(n?p)q?，0?n?15x(n)??e??0,others

2(2)attenuatedsinesequence

?e??nsin2?fn,0?n?15x(n)???0,others

4QuittingMATLAB

Typingquitonthecommandwindowwillclosetheprogram.DonotforgettosendyourdiaryfileandM-filetoyourTA.

DonotforgettodeleteyourfilesfromtheharddiskofthePCyouusedinthelabattheendofthelabsession.

四川師范大學(xué)MATLAB語(yǔ)言試驗(yàn)報(bào)告8

系級(jí)班年月日

試驗(yàn)名稱：digitalfilterdesign

姓名學(xué)號(hào)指導(dǎo)教師成績(jī)1Objective

TheobjectiveofthislabistofamiliarizeyouwiththeMATLABdigitalfilterdesign.

2FIRfilterdesign

WriteaprogramthatcompleteFIRfilterdesignusingwindowmethod.Programmustreturnmagnitude-frequencyandphase-frequencyfigureoffilteryoudesigned.Designspecificationislistedbelow:

(1)designalinearphaseFIRfilterwhichapproachidealmagnitude-frequencycharacteristic:

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?1,0???0.4?Hd(j?)???0,else,Itslengthis8.

(2)de