Writing Fast MATLAB Code英文学习资料

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1、WritingFastMATLABCodePascalGetreuerAugust11,2004Contents1TheProler22ArrayPreallocation33Vectorization53.1VectorizedComputations....................................53.2VectorizedLogic.........................................63.3Example1:Removingelements.........................

2、........73.4Example2:Piecewisefunctions.................................83.5Example3:Drawingimageswithmeshgrid..........................83.6Example4:Polynomialinterpolation..............................94ReferencingOperations114.1Subscriptsvs.Indices............................

3、..........114.2VectorizedSubscripts.......................................114.3VectorIndices...........................................124.4ReferenceWildcards,:......................................134.5DeletingSubmatriceswith[]..................................135Miscellaneous

4、Tricks135.1Convertanyarrayintoacolumnvector............................135.2Getthenumberofelementsinanarray............................145.3Boundavaluewithoutifstatements..............................145.4Findthemin/maxofamatrixorN-darray..........................145.5Repeating

5、/tilingvectorswithoutrepmat............................155.6VectorizeduseofsetonGUIobjects..............................156GoingFurther16MATLABisapopularprogramminglanguageforitssimplicityandbroadrangeoftoolsfortopicslikesignalprocessing,statistics,dierentialequations,andofcou

6、rse,matrices.Userscaneasilyaddtheirownm-lefunctionsforspecicapplications,furtherextendingMATLAB'susefulness.However,theMATLABprogramminglanguageisparsed{codeisinterpretedandtranslatedintocom-puteroperationsinrealtime{wherefasterlanguageslikeC/C++arecompiledaheadoftimeintothec

7、omputer'snativelanguage.Someadvantagestoparsinginrealtimearegreaterplatformindependence,robustness,andeasierdebugging.(AlsonotethatMATLAB'seval"functionhasnoC++equivalent.)Thedisadvantageofparsinginrealtimeissignicantlossinspeed,aswellasincreasedoverheadandlesslow-levelcontro

8、l.Tocompensate,MATLABoersmeanstohelpspeedupcode.Thisa