MATLAB The name of MATLAB stands for matrix

MATLAB • The name of MATLAB stands for matrix laboratory. • Starting a MATLAB Session -On Microsoft® Windows® platforms, start the MATLAB program by double-clicking the MATLAB R 2009 a shortcut on your Windows desktop. -Or from Start –All programs-Matlab

The Desktop of MATLAB • When you start MATLAB, the desktop appears, containing tools (graphical user interfaces) for managing files, variables, and applications associated with MATLAB

The default MATLAB Desktop

• The screen of MATLAB consist of four windows. These are the : -command window -command history window -current directory -workspace

• Command window -used to type instructions of various types called commands, functions and statements. -MATLAB displays the prompt >> to indicate that it is ready to receive instructions.

• Command history window -This window shows all the previous keystrokes you entered in the command window -It is useful for keeping track of what you typed

• Current Directory window -use it to access files -Double clicking on a file name with the extension. m will open that file in the MATLAB editor

• Workspace window: -displays the variables created in the command window

An Example interactive (Calculator) Session Note: MATLAB uses high precision for its computations. But by default it usually displays its results using four decimal places( short format )

Entering Commands and. Expressions • MATLAB retains your previous keystrokes. • Use the up-arrow ↑ key to scroll back & back through the commands. Press the ↑ key once to see the previous entry, and so on. • Use the down-arrow ↓ key to scroll forward. • Edit a line using the left ← - and right → -arrow • keys the Backspace key, and the Delete key. • Press the Enter ↵ key to execute the command. • You can see the previous keystrokes displayed in the Command History window. Execute by double click. • You can copy (highlighting & ctrl+c) a line from Command history window, to Command window.

The MATLAB Help System � To explore the more advanced features of MATLAB not covered in this course, you will need to know how to use effectively the MATLAB. � The MATLAB has Help System to get help for using Math Works products. � MATLAB Help System consists of : 1 -Help Browser 2 -Help Functions 3 -Other Resources

Help Browser • The Help Browser enables you to search and view documentation for MATLAB and other Math Works products. • Help menu→ Product Help or click the question mark button in the toolbar

�The Help Browser contains two window “panes” : a-Help Navigator b-Display Pane. �The Help Navigator contains four tabs: 1 -Contents: a contents listing tab. 2 -Index: a global index tab. 3 - Search: a search tab having a find function and full text search features. 4 - Demos: a bookmarking tab to start built-in demonstrations.

Help Functions � help funcname: Displays in the Command window a description of the specified function funcname. � lookfor topic: Displays in the Command window a brief description for all functions whose description includes the specified key word topic. � doc funcname: Opens the Help Browser to the reference page for the specified function funcname, providing a description, additional remarks, and examples.

Other Resources • Search documentation for other Math. Works products. • Books. • Internet