CS100J, Fall 2001
Tues 11/26
Lecture 24
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Announcements:
+ T3 grading is tonight and tomorrow
+ P6 and makeup, which are combined, due Tues 12/4
+ E11 due Thurs 11/28: redo Prelim 1's Problem 3 in MATLAB
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Topics:
+ no more Java, except for $args$ on last lecture
+ MATLAB
  - development environment
  - files and path
  - language
  - flow control
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What is MATLAB?
+ stands for MATtrix LABoratory
+ From MATLAB's Help document, Getting Started: Introduction:
  "MATLABŪ is a high-performance language for technical computing. 
   It integrates computation, visualization, and programming in an 
   easy-to-use environment where problems and solutions are expressed 
   in familiar mathematical notation."
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Running MATLAB:
+ OS:
  - Windows: Programs menu
  - UNIX:    enter $matlab$ at the command prompt
  - Mac:     nope (unless you have older version)
+ First thing to do:
  - select Help->MATLAB Help menu
  - MATLAB opens the Help Browser
  - select MATLAB:Getting Started and read everything
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Development environment:
+ see in Help Browser:
  - Getting Started: Development Environment: MATLAB Desktop
  - MATLAB:Using MATLAB:Development Environment
+ two "places" to program:
  - Command Window (workspace)
  - Edit Window (M-File)
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Command Window
+ MATLAB's "main" window
  - enter commands at prompt (>>)
  - type a command and then press Return or Enter
  - this is the "brain"
    + carves up memory for programs
    + acts upon commands and lines of code
+ The "brain" is called the MATLAB workspace or base workspace:
  - processes and evaluates commands
  - remembers variables and commands you have entered
+ key strokes for short cuts
  (see Development Environment: Using the Desktop: 
   Keyboard Shortcuts and Accelerators):
+ Handy commands:
  more on  % turn on pager (spacebar)
  clc      % clear screen
  clear    % clear variable assignments
  format   % set output preferences (see also File-> Preferences menu)
  ver      % version of MATLAB
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Edit Window and M-Files
+ using the command window for all programs can be tedious
+ store statements in separate file called M-File
+ create file, store statements, run "program" in Command Window
  - create ASCII files:
    File->New->M-File or use your own text editor
  - name of file is the program name 
    example) blah.m has the name $blah$
+ 2 kinds of files:
  - scripts:   collections of commands that you could enter at the prompt
  - functions: a script that is labeled with a name that can take arguments
               and return values
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Path and working directory:
+ see Development Environment: Workspace, Path, and File Operations
+ PATH: the directories/folders where M-Files are stored
  - MATLAB needs to find your file to run it
  - MATLAB will search from beginning to end when you use a file
  - MATLAB stores the path in a special variable (pathdef)
  - enter PATH to see current path
+ set path by File->Set Path...
  - add a directory (also called folder)
  - position is important!
+ current working directory:
  - MATLAB keeps track of the most curret directory to find files
  - called the CURRENT WORKING DIRECTORY (from UNIX)
  - PWD shows the cwd (see top bar on desktop)
+ names (see Development Environment: Workspace, Path, and File Operations: 
         Search Path):
  - MATLAB checks if a name is a variable
  - then MATLAB checks if a name is a builtin function
  - MATLAB checks the CWD
  - MATLAB searches the path, from top to bottom
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Handy file commands:
  edit     : open a new M-File
  path     : show current path
  editpath : modify path
  addpath  : add a directory to the path
  pwd      : show the current working directory
  cd       : change the current working directory
  what     : list M-Files in current directory
  type     : show contents of M-File in Command Window
  exist    : check if M-file exists
  ls       : list all files in current working directory
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Language Elements
+ Characters
  - usually keyboard characters (ASCII text)
  - see characters.txt
+ Tokens, Expressions, Statements:
  - see tokens.txt and statements.txt
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Statements:
+ Input/Output:      see io.txt and readIntPrompt.txt
+ Selection:         see matlabifhelp.txt
+ Repetition:        see matlabwhilehelp.txt matlabforhelp.txt
+ Generating values: see values.txt



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