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Writing Fast MATLAB Code - web.cecs.pdx.edu

Pascal Getreuer, February 2009 ContentsPage1 Introduction12 The Profiler33 Array Preallocation54 JIT Acceleration75 Vectorization96 Inlining Simple Functions147 Referencing Operations168 SolvingAx=b199 Numerical Integration2210 Signal Processing2611 Miscellaneous2912 Further Reading311 IntroductionMatlabis aprototypingenvironment, meaning it focuses on the ease of development with languageflexibility, interactive debugging, and other conveniences lacking in performance-oriented languages likeC andFortran. WhileMatlabmay not be as fast as C, there are ways to bring it is not a beginner s tutorial toMatlab, but a tutorial onperformance.

Use it with the profile command: profileon Turn the pro ler on profileoff Turn it back o profileclear Clear pro le statistics profilereport View the results from the pro ler ... %EquivalenttoA=repmat(s,m,n); This method avoids the overhead of calling an M- le function. It is never slower than repmat (critics should note that repmat.m itself ...

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