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1、PascalGetreuer,February2009ContentsPage1Introduction12ThePro ler33ArrayPreallocation54JITAcceleration75Vectorization96InliningSimpleFunctions147ReferencingOperations168SolvingAx=b199NumericalIntegration2210SignalProcessing2611Miscellaneous2912FurtherReading311IntroductionMatlabisaprototyp
2、ingenvironment,meaningitfocusesontheeaseofdevelopmentwithlanguage
exibility,interactivedebugging,andotherconvenienceslackinginperformance-orientedlanguageslikeCandFortran.WhileMatlabmaynotbeasfastasC,therearewaystobringitcloser.DisclaimerThisisnotabeginner'stutorialtoMatlab,butatutorialon
3、performance.Themethodsdiscussedherearegenerallyfast,butnoclaimismadeonwhatisfastest.Useatyourownrisk.Beforebeginningourmaintopic,let'sstepbackforamomentandaskourselveswhatwereallywant.Dowewantthefastestpossiblecode?
4、ifso,weshouldswitchtoaperformancelanguagelikeC.Probablymoreaccurately,wew
5、anttospendlesstimetotalfromdeveloping,debugging,running,anduntil nallyobtainingresults.Thissectiongivessometipsonworkingsmart,nothard.M-LintMessagesInmorerecentversionsofMatlab,theintegratededitorautomaticallygivesfeedbackonpossiblecodeerrorsandsuggestedoptimizations.Thesemessagesarehelpf
6、ulinimprovingaprogramandinlearningmoreaboutMatlab.fork=1:NumTrialsr=rand;x(k)=runsim(r);endpxpmightbegrowinginsidealoop.Considerpreallocatingforspeed.hist(x);%PlothistogramofsimulationoutputsHoldthemousecursoroverunderlinedcodetoreadamessage.Or,seeallM-Lintmessagesatonce:::::::::::::::wit
7、hTools!M-Lint!ShowM-LintReport.OrganizationUseaseparatefolderforeachproject.Aseparatefolderforeachprojectkeepsrelatedthingstogetherandsimpli esmakingcopiesandbackupsofproject les.Writeheadercomments,especiallyH1.The rstlineoftheheadercommentiscalledtheH1comment.Typehelp(cd)togetalistingof
8、allproject lesandtheirH1comments.1Savefrequentconsolecommandsasascript.Ifyou ndyourselfrepeatingcertaincommandsontheconsole,savethemasascript.Lesstypingmeansfeweropportunitiesfortypos.AvoidlosingdataDon'tuseclearallinascript.Thisisanunfortunatecommonpractice
9、anyimpo
