Schlomer N. Guidelines for writing clean and fast code in MATLAB (en)(34s)

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1、GuidelinesforwritingcleanandfastcodeinMATLAB®NicoSchlömer∗June3,2009ThisdocumentisaimedatMATLAB®beginnerswhoalreadyknowthesyntaxbutfeelarenotyetquiteexperiencedwithit.ItsgoalistogiveanumberofhintswhichenablethereadertowritequalityMATLAB®programsandtoavoidcommonlymademistakes.Therearethr

2、eemajorindependentchapterswhichmayverywellbereadseparately.Also,theindividualchapterseachsplitupintooneortwohandfulofchunksofinformation.Inthatsense,thisdocumentisreallyaslightlyextendedlistofdosanddon’ts.Chapter1describessomeaspectsofcleancode.Theimpactofasubsectionforthecleanlinessoft

3、hecodeisindicatedbyonetofiveÕ–symbols,wherefiveÕ’swanttosaythatfollowingthegivensuggestionisofgreatimportanceforthecomprehensibilityofthecode.Chapter2describeshowtospeedupthecodeandislargelyalistofmistakesthatbeginnersmaytendtomake.Thistime,theE-symbolrepresentstheamountofspeedthatyoucoul

4、dgainwhenstickingtothehintsgivenintherespectivesection.Thisguideiswrittenaspartofabasiccourseinnumericalanalysis,mostexamplesandcodeswillhencetendtorefertonumericalintegrationordifferentialequations.However,almostallaspectsareofgeneralnatureandwillalsobeofinteresttoanyoneusingMATLAB®.Con

5、tentsMATLAB®alternatives3GNUOctave.....................................3Scilab.........................................4∗UniversiteitAntwerpen,Middelheimlaan1,2020Antwerpen,Belgium.E-mail:nico.schloemer@ua.ac.be.11Codingclean5Multiplefunctionsperfile–ÕÕÕ.......................5Variablean

6、dfunctionnames–ÕÕÕ......................7Indentation–ÕÕÕÕ..............................9Linelength–Õ...................................10Spacesandalignment–ÕÕÕ..........................11Magicnumbers–ÕÕÕ.............................11Comments–ÕÕÕÕÕ............................12Usageofbr

7、ackets–ÕÕ..............................13Errorsandwarnings–ÕÕ............................13Switchstatements–ÕÕ.............................162Codingfast19Usingtheprofiler...................................19TheMATtrixLABoratory..............................19Matrixpre-allocation