matlab introduction.ppt

DSP Laboratory Using Matlab Introduction to MATLAB Topics Introduction Running MATLAB and MATLAB Environment Getting help Variables Vectors, Matrices, and linear Algebra Mathematical Functions and Applications Plotting Programming M-files User Defined Functions What is MATLAB An interactive numerical computing environment Matrix computations Graphics Programming (M-files) Toolboxes (signal processing, statistics, optimization, symbolic math) Advantage of MATLAB(1) Easy, interactive environment Fast numerical algorithms Inexpensive software Fun and easy environment for learning Linear Algebra!! Advantage of MATLAB(2) Example: a system of 3 linear equations with 3 unknowns (x1, x2, x3) 3 x1 + 2x2 - x3 = 10 - x1 + 3x2 + 2x3 = 5 x1 - 2x2 - x3 = -1 Let: Running MATLAB Main Working Windows DisplayWindows Graphic (Figure) Window Displays plots and graphs Creates response to graphics commands M-file editor/debugger window Create and edit scripts of commands called M-files Set path File->set path: view, add or remove path Command window: path: displays the current MATLAB search path addpath :Add directories to MATLAB search path Examples: For the current path, viewed by typing path you can add c:/matlab/mymfiles to the front of the path by typing addpath('c:/matlab/mymfiles') Getting Help Getting Help Type one of the following commands in the command window: help – lists all the help topics help topic – provides help for the specified topic help command – provides help for the specified command helpwin – opens a separate help window for navigation lookfor keyword – search all M-files for keyword Online resource Variables Variable names: Must start with a letter. May contain only letters, digits, and the underscore “_”. MATLAB is case sensitive, for example one & ONE are different variables. MATLAB only recognizes the first 31 characters in a variable name. Assignment statement: Variable = number