MATLAB Introduction Programming For DSP

8/12/2019 MATLAB Introduction Programming For DSP

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MATLAB

Introduction


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MATLAB is a software package for highperformance numerical computation andvisualization.

It provides an interactive environment withmany built-in functions for technicalcomputations

MATLABMATrix LABoratory

Introduction


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Introduction

MATLAB is matrix-oriented, so what wouldtake several statements in C or Fortran can

usually be accomplished in just a few lines using

MATLAB's built-in matrix and vectoroperations.

MATLAB Graphical User Interface (GUI)

tools enable to use MATLAB as anapplication development tool.


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Introduction

MATLABs built-in functions provideexcellent tools for:

Linear Algebra

Data Analysis

Signal Processing

Image Processing

Speech Processing

Control System Design


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All data in MATLAB are stored as arrays. Allows to quickly manipulate sets of data in a wide

variety of ways.

Addition to matrix orientation, offers programmingfeatures that are similar to those of other

programming languages.

Introduction


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Introduction

MATLAB desktop: This window is the primarygraphical user interface for MATLAB.

Command window: The primary place wherein

we can interact with MATLAB. The cursor and prompt (>>) signify that

MATLAB is waiting to perform a mathematical

operation.


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Introduction

Z = 10 Creates a variable named z, stores a value 10 in

it, saves it as a part of memory known as

workspace browser. All commands executed in the command widow

share a common workspace, so that they can all

share a variable.


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Introduction

Save: Stores workspace values (variable names, sizes, and values), inthe binary file matlab.mat in the present working directory

save data:

Stores all workspace values in the file data.mat

save data_1 x y:

Stores only the variables x and y in the file data_1.mat

load data 1:

Loads the values of the workspace values previously stored in thefile data_1.mat


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Introduction

The collection of variables in a MATLAB session iscalled the workspace.

To list the variables in the workspace, type who.

To list the variables with their sizes, type whos.

To delete a variable from the workspace, type clear

variable.

Typing clear by itself clears all the variables from the

workspace.


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Introduction

Workspace operations Command line who - list all variables

whos - variable names, types and sizes clear var1 var2- delete listed variables

clear - delete all variables

Desktop tools Edit menu (clear workspace)

Workspace viewer + context menu


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Introduction

Has a number of predefined special values They can be used at any time in MATLAB

These predefined values are stored as ordinary

variables in the workspace so they can beoverwritten or modified by the user.

But it is customary to never redefine a

predefined variable


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Introduction

Some of the predefined special values are: pi, i, j, Inf, NaN, clock, date, eps, ans

NaN = not a number (0/0)

eps = is the smallest difference between two

numbers that can be represented by the

computer.

ans = name of an undefined variable.


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Special values

ans: answer when expression is not assigned

eps: Floating point precision

pi: 3.141592653589793

i,j: Square root of (-1)

inf: NaN: Not a Number

clock: Time and Date

tic, toc: Stopwatch timer functions

flops: Floating point operation count nargin: number of function input arguments

nargout: number of function output arguments

Introduction


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Introduction General Purpose Commands

help: Help facility demo: Run demonstrations

who: list variables in memory

what: list m-files on disk

size: row and column dimensions

length: Vector length

clear: Clear workspace computer: Type of Computer

ctrl+C: local abort

quit: terminate program

exit: same as quit

clc: clear command screen

home: home cursor

format: set output display format disp: display matrix or text

fprintf: print formatted number in a file

Echo: Enable command echoing

More: Control paged output in command window


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Introduction

Debugging Commands

dbstop: set breakpoint

dbclear: remove breakpoint

dbcont: resume execution

dbdown: change local workspace context dbstack: list who called whom

dbstatus: list all breakpoints

dbstep: execute one or more lines

dbtype: list M-le with line numbers dbup: change local workspace context

dbquit: quit debug mode


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Introduction

File Manipulation dir: Directory of files on disk

type: list file

delete: Delete file

cd: Change Directory

MATLAB Introduction Programming For DSP

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