50Basic Examples for Matlab
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INTRODUCTION TO MATLAB FOR ENGINEERING STUDENTS
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Appendix A: Matlab Code Examples
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INTRODUCTION TO MATLAB FOR ENGINEERING STUDENTS
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matlab-basic-functions-reference.pdf
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Example 1 2Here we give an example of the simple use of brackets: > format rat > a = 2; b = 3; c = 4; > a*(b+c) > a*b+c > a/b+c > a/(b+c) > format In this example you should get the answers 14 10 14/3 and 2/7 Hopefully thisgives you some idea that brackets make MATLAB perform those calculations?rst
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INTRODUCTION TO MATLAB FOR
ENGINEERING STUDENTS
David Houcque
Northwestern University
(version 1.2, August 2005)Contents
1Tutorial lessons 1
1 1.1Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2Basic features
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3A minimum MATLAB session
. . . . . . . . . . . . . . . . . . . . . . . . . . 21.3.1 Starting MATLAB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3.2 Using MATLAB as a calculator . . . . . . . . . . . . . . . . . . . . . 4
1.3.3 Quitting MATLAB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4Getting started
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.4.1 Creating MATLAB variables . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.2 Overwriting variable . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.3 Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.4 Making corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.5 Controlling the hierarchy of operations or precedence . . . . . . . . . 6
1.4.6 Controlling the appearance of °oating point number . . . . . . . . . . 8
1.4.7 Managing the workspace . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4.8 Keeping track of your work session . . . . . . . . . . . . . . . . . . . 9
1.4.9 Entering multiple statements per line . . . . . . . . . . . . . . . . . . 9
1.4.10 Miscellaneous commands . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.4.11 Getting help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.5Exercises
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2Tutorial lessons 2
12 2.1Mathematical functions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.1.1 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
i 2.2Basic plotting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.2.1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.2 Creating simple plots . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.3 Adding titles, axis labels, and annotations . . . . . . . . . . . . . . . 15
2.2.4 Multiple data sets in one plot . . . . . . . . . . . . . . . . . . . . . . 16
2.2.5 Specifying line styles and colors . . . . . . . . . . . . . . . . . . . . . 17
2.3Exercises
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.4Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.5Matrix generation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192.5.1 Entering a vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.5.2 Entering a matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.5.3 Matrix indexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.5.4 Colon operator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.5.5 Linear spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.5.6 Colon operator in a matrix . . . . . . . . . . . . . . . . . . . . . . . . 22
2.5.7 Creating a sub-matrix . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.5.8 Deleting row or column . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.5.9 Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.5.10 Continuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.5.11 Transposing a matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.5.12 Concatenating matrices . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.5.13 Matrix generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.5.14 Special matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.6Exercises
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3Array operations and Linear equations
303.1
Array operations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.1.1 Matrix arithmetic operations . . . . . . . . . . . . . . . . . . . . . . . 30
3.1.2 Array arithmetic operations . . . . . . . . . . . . . . . . . . . . . . . 30
3.2 Solving linear equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.2.1 Matrix inverse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
ii3.2.2 Matrix functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.3Exercises
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4Introduction to programming in MATLAB
354.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.2 M-File Scripts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.2.1 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.2.2 Script side-e®ects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.3 M-File functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.3.1 Anatomy of a M-File function . . . . . . . . . . . . . . . . . . . . . . 38
4.3.2 Input and output arguments . . . . . . . . . . . . . . . . . . . . . . . 40
4.4 Input to a script ¯le . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.5 Output commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.6Exercises
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5Control °ow and operators
435.1
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5.2Control °ow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435.2.1 The``if...end''structure . . . . . . . . . . . . . . . . . . . . . . . 43
5.2.2 Relational and logical operators . . . . . . . . . . . . . . . . . . . . . 45
5.2.3 The``for...end''loop . . . . . . . . . . . . . . . . . . . . . . . . . 45
5.2.4 The``while...end''loop . . . . . . . . . . . . . . . . . . . . . . . 46
5.2.5 Other °ow structures . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
5.2.6 Operator precedence . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.3Saving output to a ¯le
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 5.4Exercises
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 6Debugging M-¯les
496.1
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 6.2Debugging process
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 496.2.1 Preparing for debugging . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.2.2 Setting breakpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
iii6.2.3 Running with breakpoints . . . . . . . . . . . . . . . . . . . . . . . . 50
6.2.4 Examining values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.2.5 Correcting and ending debugging . . . . . . . . . . . . . . . . . . . . 51
6.2.6 Ending debugging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.2.7 Correcting an M-¯le . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
ASummary of commands
53B
Release notes for Release 14 with Service Pack 2
58B.1
Summary of changes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 B.2Other changes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 B.3Further details
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 CMain characteristics of MATLAB
62C.1
History
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 C.2Strengths
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 C.3Weaknesses
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 C.4Competition
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 ivList of Tables
1.1 Basic arithmetic operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Hierarchy of arithmetic operations . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Elementary functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 Prede¯ned constant values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3 Attributes forplot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.4 Elementary matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.5 Special matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.1 Array operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.2 Summary of matrix and array operations . . . . . . . . . . . . . . . . . . . . 32
3.3 Matrix functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.1 Anatomy of a M-File function . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.2 Di®erence between scripts and functions . . . . . . . . . . . . . . . . . . . . 39
4.3 Example of input and output arguments . . . . . . . . . . . . . . . . . . . . 40
4.4dispandfprintfcommands . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.1 Relational and logical operators . . . . . . . . . . . . . . . . . . . . . . . . . 45
5.2 Operator precedence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A.1Arithmetic operators and special characters
. . . . . . . . . . . . . . . 53 A.2Array operators
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 A.3Relational and logical operators
. . . . . . . . . . . . . . . . . . . . . . 54 A.4Managing workspace and ¯le commands
. . . . . . . . . . . . . . . . . 55 A.5Prede¯ned variables and math constants
. . . . . . . . . . . . . . . . . 55 v A.6Elementary matrices and arrays
. . . . . . . . . . . . . . . . . . . . . . 56 A.7Arrays and Matrices: Basic information
. . . . . . . . . . . . . . . . . 56 A.8Arrays and Matrices: operations and manipulation
. . . . . . . . . . 56 A.9 Arrays and Matrices: matrix analysis and linear equations . . . . . 57 viList of Figures
1.1 The graphical interface to the MATLAB workspace . . . . . . . . . . . . . . 3
2.1 Plot for the vectors x and y . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2 Plot of the Sine function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3 Typical example of multiple plots . . . . . . . . . . . . . . . . . . . . . . . . 17
viiPreface
\Introduction to MATLAB for Engineering Students" is a document for an introductory course in MATLAB R°1and technical computing. It is used for freshmen classes at North- western University. This document is not a comprehensive introduction or a reference man- ual. Instead, it focuses on the speci¯c features of MATLAB that are useful for engineering classes. The lab sessions are used with one main goal: to allow students to become familiar with computer software (e.g., MATLAB) to solve application problems. We assume that the students have no prior experience with MATLAB. The availability of technical computing environment such as MATLAB is now reshaping the role and applications of computer laboratory projects to involve students in more intense problem-solving experience. This availability also provides an opportunity to easily conduct numerical experiments and to tackle realistic and more complicated problems. Originally, the manual is divided into computer laboratory sessions (labs). The lab document is designed to be used by the students while working at the computer. The emphasis here is \learning by doing". This quiz-like session is supposed to be fully completed in 50 minutes in class. The seven lab sessions include not only the basic concepts of MATLAB, but also an in- troduction to scienti¯c computing, in which they will be useful for the upcoming engineering courses. In addition, engineering students will see MATLAB in their other courses. The end of this document contains two useful sections: a Glossary which contains the brief summary of the commands and built-in functions as well as a collection of release notes. The release notes, which include several new features of the Release 14 with Service Pack2, well known as R14SP2, can also be found in Appendix. All of the MATLAB commands
have been tested to take advantage with new features of the current version of MATLAB available here at Northwestern (R14SP2). Although, most of the examples and exercises still work with previous releases as well. This manual re°ects the ongoing e®ort of the McCormick School of Engineering and Applied Science leading by Dean Stephen Carr to institute a signi¯cant technical computing in the Engineering FirstR°2courses taught at Northwestern University.
Finally, the students - Engineering Analysis (EA) Section - deserve my special grati- tude. They were very active participants in class.David Houcque
Evanston, Illinois
August 2005
1 MATLABR°is a registered trademark of MathWorks, Inc.2Engineering FirstR°is a registered trademark of McCormick
School of Engineering and Applied Science (Northwestern University) viiiAcknowledgements
I would like to thank Dean Stephen Carr for his constant support. I am grateful to a number of people who o®ered helpful advice and comments. I want to thank the EA1 instructors (Fall Quarter 2004), in particular Randy Freeman, Jorge Nocedal, and Allen Ta°ove for their helpful reviews on some speci¯c parts of the document. I also want to thank Malcomb MacIver, EA3 Honors instructor (Spring 2005) for helping me to better understand the animationof system dynamics using MATLAB. I am particularly indebted to the many students (340 or so) who have used these materials, and have communicated their comments and suggestions. Finally, I want to thank IT personnel for helping setting up the classes and other computer related work: Rebecca Swierz, Jesse Becker, Rick Mazec, Alan Wol®, KenKalan, Mike Vilches, and Daniel Lee.
About the author
David Houcque has more than 25 years' experience in the modeling and simulation of struc- tures and solid continua including 14 years in industry. In industry, he has been working as R&D engineer in the ¯elds of nuclear engineering, oil rig platform o®shore design, oil reser- voir engineering, and steel industry. All of these include working in di®erent international environments: Germany, France, Norway, and United Arab Emirates. Among other things, he has a combined background experience: scienti¯c computing and engineering expertise. He earned his academic degrees from Europe and the United States. Here at Northwestern University, he is working under the supervision of Professor Brian Moran, a world-renowned expert in fracture mechanics, to investigate the integrity assess- ment of the aging highway bridges under severe operating conditions and corrosion. ixChapter 1
Tutorial lessons 1
1.1Introduction
The tutorials are independent of the rest of the document. The primarily objective is to help you learnquicklythe ¯rst steps. The emphasis here is \learning by doing". Therefore, the best way to learn is by trying it yourself. Working through the examples will give you a feel for the way that MATLAB operates. In this introduction we will describe how MATLAB handles simple numerical expressions and mathematical formulas.quotesdbs_dbs17.pdfusesText_23[PDF] excel 2013 bible pdf
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