MATLAB array manipulation tips and tricks

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CONTENTSvAppendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55A MATLAB resources 55
PrefaceThe essenceThis document is intended to be a compilation of tips and tricks mainly related to efficient waysof manipulating arrays in MATLAB. Here, “manipulating arrays” includes replicating and rotatingarrays or parts of arrays, inserting, extracting, replacing, permuting and shifting arrays or parts ofarrays, generating combinations and permutations of elements, run-length encoding and decoding,arithmetic operations like multiplying and dividing arrays, calculating distance matrices and more.A few other issues related to writing fast MATLAB code are also covered.I want to thank Ken Doniger, Dr. Denis Gilbert for their contributions, suggestions, and corrections.Why I wrote thisSince the early 1990’s I have been following the discussions in the main MATLAB newsgroup onUsenet, comp.soft-sys.matlab. I realized that many of the postings in the group were about howto manipulate arrays efficiently, which was something I had a great interest in. Since many of thesame questions appeared again and again, I decided to start collecting what I thought were the mostinterestings problems and solutions and see if I could compile them into one document. That wasthe beginning of what you are now reading.Intended audienceThis document is mainly intended for those of you who already know the basics of MATLAB andwould like to dig further into the material regarding manipulating arrays efficiently.How to read thisThis document is more of a reference than a tutorial. Although it might be read from beginning toend, the best way to use it is probably to get familiar with what is covered and then look it up herewhen you bump into a problem which is covered here.The language is rather technical although many of the terms used are explained. The index at theback should be an aid in finding the explanation for a term unfamiliar to you.vi
Page 1 and 2: MATLAB array manipulation tips and
Page 4: CONTENTSiii7 Replicating elements a
Page 9 and 10: Chapter 1High-level vs low-level co
Page 11 and 12: Chapter 2Operators, functions and s
Page 13 and 14: CHAPTER 2. OPERATORS, FUNCTIONS AND
Page 15 and 16: CHAPTER 3. BASIC ARRAY PROPERTIES 7
Page 17 and 18: Chapter 4Array indices and subscrip
Page 19 and 20: CHAPTER 5. CREATING BASIC VECTORS,
Page 21 and 22: Chapter 7Replicating elements and a
Page 23 and 24: CHAPTER 7. REPLICATING ELEMENTS AND
Page 25 and 26: CHAPTER 8. RESHAPING ARRAYS 17Now,X
Page 27 and 28: CHAPTER 8. RESHAPING ARRAYS 198.1.7
Page 29 and 30: CHAPTER 9. ROTATING MATRICES AND AR
Page 39 and 40: CHAPTER 10. BASIC ARITHMETIC OPERAT
Page 42 and 43: CHAPTER 10. BASIC ARITHMETIC OPERAT
Page 44 and 45: CHAPTER 11. MORE COMPLICATED ARITHM
Page 46 and 47: Chapter 12Statistics, probability a
Page 48 and 49: CHAPTER 12. STATISTICS, PROBABILITY
Page 50 and 51: CHAPTER 13. IDENTIFYING TYPES OF AR
Page 52 and 53: Chapter 14Logical operators and com
Page 54 and 55: Chapter 15MiscellaneousThis section
Page 56 and 57:
CHAPTER 15. MISCELLANEOUS 4815.3 Ma
Page 58 and 59:
CHAPTER 15. MISCELLANEOUS 5015.4.3
Page 60 and 61:
CHAPTER 15. MISCELLANEOUS 52bin = d
Page 62 and 63:
Indexmatlab faq, 55comp.soft-sys.ma
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MATLAB array manipulation tips and tricks

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