Startup and Shutdown :

Matlab (Windows)             :  Start MATLAB program (Windows platforms)

Exit                                      :  Terminate MATLAB program (same as quit)

Matlabrc                             :   Master Startup M-file for MATLAB -automatically executed by MATLAB during        startup

Startup                                :  Startup file for user-defined options.

finish                                    : Termination file for MATLAB program

Basic Settings :

Prefdir                                :  Preference directory name. returns directory containing preferences for MATLAB and related products.

Preferences                       : Open user settable Preferences dialog.

Help and Support :

Doc                                    : Reference page in Help browser

help                                   : Help for functions in Command Window

docsearch                         : Help browser search

lookfor                              : Search for keyword in all help entries

version                            :  Version number for MATLAB and libraries

Ver                                  :  Version information for MathWorks products

MATLAB Commands :

Code Performance:

Bench                   :   MATLAB Benchmark

cputime               :   Elapsed Cpu time in Seconds.

Memory              :   Display memory information on how much available and how much being used.

Profile                  : Profile execution time for function

profsave              : Save profile report in HTML format.

Memory Usage :

inmem                : Names of functions, MEX-files, classes in memory.

memory             : Displays Memory Information

pack                   : Consolidated memory space.

Workspace :

Clear                : Remove items from workspace, freeing up system memory

Clearvars         : Clear variables from memory.

disp                   : Display text or array.

openvar            : Open workspace variable in variables editor or other graphical editing tool.

Who                  : list variables in workspace.

Whos               : List variables in workspace, with sizes and types.

Load               :  Load Data from MAT-file into workspace.

Save               : Save Workspace variables to files.

Mat File         :  Load and save parts of variables in MAT-files

Workspace    :  Open Workspace browser to manage workspace

M-Files : Script and Function Files

When problems become complicated and require re–evaluation, entering command at MATLAB prompt is not practical

Solution : use M-files

Script  : Collection of Commands executed in sequence when called.

Saved with extension “.m”

Function : User Defined Commands Normally has input & Output.

Saved with the extension “.m”

What id M -File ?

• Simple text file containing MATLAB commands
• Executes Matlab commands sequentially
• Identified by ‘.m‘ extension – in Windows OS (e.g. test.m)

Advantages of M-Files ?

• Easy editing and saving of work
• Undo changes
• Readability/Portability – non executable comments can be added using the ‘%’ symbol to make commands easier to understand
• Saving M-files is far more memory efficient than saving a workspace

How to Execute ?

• By typing filename at the MATLAB command prompt – It will be executed provided that the saved file is in the known path
• From Scripting editor, by clicking run button

At Matlab prompt type in edit to invoke M-file editor

 

Syntax:  function [y1,…,yN] = myfun(x1,…,xM)

• Declares a function named myfun that accepts inputs x1,…,xM and returns outputs y1,…,yN.
• This declaration statement must be the first executable line of the function
• Save the function code in a text file with a .m extension
• The name of the file should match the name of the first function in the file

Anonymous Functions:

• contain only a single executable statement
• associated with a variable
• not stored in a program file

Example:

sqr = @(x) x.^2;

a = sqr(5)

a =    25

Scripting Basics :

if/elseif/else     : Execute statements if condition is true

for                       : Execute statements specified number of times

Switch/case/Otherwise : Switch among several cases based on expression

break                 : Terminate execution of for or while loop

Condition Statements

• It is often necessary to only perform matlab operations when certain conditions are met
• Relational and Logical operators are used to define specific conditions
• Simple flow control in matlab is performed with the ‘If’, ‘Else’, ‘Elseif’ and ‘Switch’ statements

If, Else, and Elseif

• An if statement evaluates a group of commands when the logical expression is evaluated as true
• The list of conditional commands are terminated by the end statement
• If the logical expression is evaluated as false, all the conditional commands are skipped
• Execution of the script resumes after the end statement

Basic form:

if logical_expression

commands

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