Introduction to Matlab

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Introduction to Matlab

• By
• Nazarudin,S.Si,M.Si,PhD

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What is Matlab

• MATLAB is an integrated technical computing
  environment that combines numeric computation,
  advanced graphics and visualization, and a high
  level programming language (www.mathworks.com/prod
  ucts/matlab)

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Using Matlab you can use it to

• graph functions
• solve equations,
• perform statistical tests
• and do much more.

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It is a high-level programminglanguage, so

• You can communicate with its cousins, e.g.,
  FORTRAN and C.
• You can produce sound and animate graphics.
• You can do simulations and modeling (especially
  if you have access not just to basic MATLAB but
  also to its accessory SIMULINK).
• You can prepare materials for export to the World
  Wide Web.
• In addition, you can use MATLAB, in conjunction
  with th e word processing and desktop publishing
  features of Microsoft Word, to combine
  mathematical computations with text and graphics
  to produce a polished, integrated, and
  interactive document.

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• A program this sophisticated contains many
  features and options. There
• are literally hundreds of useful commands at your
  disposal. The MATLAB
• help documentation contains thousands of entries.
  The standard references,
• whether the MathWorks Users Guide for the
  product, or any of our competitors,
• contain myriad tables describing an endless
  stream of commands,
• options, and features that the user might be
  expected to learn or access.
• MATLAB is more than a fancy calculator it is an
  extremely useful and
• versatile tool. Even if you only know a little
  about MATLAB, you can use it
• to accomplish wonderful things. The hard part,
  however, is figuring out which
• of the hundreds of commands, scores of help
  pages, and thousands of items of
• documentation you need to look at to start using
  it quickly and effectively.
• Thats where we come in

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A sophisticated program

• The program contains many features and options.
• There are literally hundreds of useful commands
  at your disposal.
• MATLAB is more than a fancy calculator it is an
  extremely useful and versatile tool. Even if you
  only know a little about MATLAB, you can use it
  to accomplish wonderful things. The hard part,
  however, is figuring out which of the hundreds of
  commands, scores of help pages, and thousands of
  items of documentation you need to look at to
  start using it quickly and effectively.

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Getting Started

• You start MATLAB as you would any other software
  application. On a PC you access it via the Start
  menu, in Programs under a folder such as MatlabR12

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A Matlab desktop
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Matlab Basics

• you can use MATLAB to do arithmetic as you would
  a calculator. You can use
• to add
• - to subtract
• to multiply
• / to divide
• ˆ to exponentiate

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Examples for arithmetic

• gtgt 3ˆ2 - (5 4)/2 63
• ans
• 510.9934
• ansˆ2 sqrt(ans)
• ans
• 510.9934

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Examples for arithmetic(continue)

• gtgt u cos(10)
• u -0.8391
• gtgt v sin(10)
• v -0.5440
• gtgt uˆ2 vˆ2
• ans 1

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Examples for algebra

• gtgt syms x y
• gtgt (x - y)(x - y)ˆ2
• ans
• (x-y)3
• gtgt expand(ans)
• ans
• x3-3x2y3xy2-y3

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Examples for algebra (continue)

• gtgt factor(ans)
• ans
• (x-y)3

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Examples for algebra (continue)

• MATLAB has a command called simplify, which you
  can sometimes use
• to express a formula as simply as possible. For
  example,
• gtgt simplify((xˆ3 - yˆ3)/(x - y))
• ans
• x2xyy2

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Example for graph
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3D surface graph
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Contour graph