CS101 section 003 Computer Programming and Problem Solving

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CS101 section 003Computer Programming
and Problem Solving

• Venkata Gopal Edupuganti
• Department of Computer Science
• Email vge2_at_njit.edu
• Office GITC 4324
• Web http//web.njit.edu/vge2

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Text Book (not required)

• MATLAB Programming for Engineers
• 4th Edition
• Stephen J. Chapman
• Thomson
• ISBN-13 978-0-495-24449-3
• ISBN-10 0-495-24449-X

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Course structure

• Mid-Term (30 points).
• Final exam (40 points).
• Assignments (20 points).
• Attendance (10 points).

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MATLAB

• MATLAB is a high-level technical computing
  language and interactive environment for
  algorithm development, data visualization, data
  analysis, and numeric computation.
• Using the MATLAB product, you can solve technical
  computing problems faster than with traditional
  programming languages, such as C, C, and
  Fortran.

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Why MATLAB?

• Ease of use
• Platform independence
• Predefined functions
• Device independent plotting
• Graphical user interface
• MATLAB compiler

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Official website

• www.mathworks.com

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Free MATLAB!

• MATLAB R2007a library
• MATLAB R2008a (b)
• MATLAB R2009a
• ist.njit.edu
• UCID
• VPN

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MATLAB Workspace
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Interactive Calculation
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Be careful about the priorities of different
operations!

• 1.4 ( 27 - 5 )
• 1
• -------
• 5.83.6
• ? 5 2

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Interactive Calculation
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• a1
• b2
• cab
• c?

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Variable

• Variables are a fundamental concept in MATLAB,
  and you will use them all the time.
• Basically, a variable is a holding place for a
  value which you can give a name to.
• The point of this is that, when calculating
  something new later, you can use the value that a
  variable refers to as part of the new
  calculation.

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Interactive Calculation
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• max31 (valid)
• 3max1 (invalid)
• max_31 (valid)
• max 31 (invalid)

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Interactive Calculation
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• a1
• b2
• cab
• Now see your command history window, workspace
  and also try whos in your command window

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disp( )

• Display text or array
• Syntax
• disp(X)
• disp(X) displays an array, without printing the
  array name. If X contains a text string, the
  string is displayed.

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disp( ) examples

• disp(' My name is Tina')
• Result ? My name is Tina
• value5
• disp(value)
• Result ? 5

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disp( ) examples

• You also can use the disp command to display a
  hyperlink in the Command Window. Include the full
  hypertext string on a single line as input to
  disp
• disp('lta href "http//www.mathworks.com"gtThe
  MathWorks Web Sitelt/agt')
• which generates this hyperlink in the Command
  Window
• The MathWorks Web Site

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• Excise 1.4
• In your command window, create a variable called
  radius with value 2.5, calculate the area of the
  circle with the given radius and give the value
  to another variable called area. Display the
  variable area.

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• Calculate the velocity (ft/sec) when
  accelaration32.2 ft/sec/sec and time5 sec with
  the following formula velocity acceleration
  time