Summer training matlab

Introduction to

MATLAB

BACKGROUND MATLAB, which stands for MATrix LABoratory, is a

software package developed by MathWorks. This software package was used initially for numerical

computations as well as some symbolic manipulation. The collection of programs (primarily in Fortran) that

eventually became MATLAB were developed in the late1970s by Cleve Moler, who used them in a numericalanalysis course he was teaching at the University of NewMexico.

Jack Little and Steve Bangert later reprogrammed theseroutines in C, and added M-files, toolboxes, and morepowerful graphics (original versions created plots byprinting asterisks on the screen).

Moler, Little, and Bangert founded MathWorks inCalifornia in 1984.

If we get a job in a particular field of engineering, university or industry we will mostly used specializedsoftware.

Why MATLAB ? Ease of Use

User Friendly

Platform Independence

Predefined Functions

Device-Independent Plotting

Graphical User interface

MATLAB Compiler

Why not MATLAB Has some drawbacks:

Slow for some kinds of processes

Cost effective

Introduction What Is MATLAB?

MATLAB (MATrix LABoratory)

Flexibility to solve a large number of problems

High-level technical computing language and interactive environment

high-performance language for technical computing

Good Tool for visualization Computation and programming is an

easy-to-use environment Has computational and graphical tools Handles real and complex

scalars, vectors and matrices Script Language is relatively easy to learn

Introduction Typical uses include:

Simple calculation

Plotting and analyzing mathematical

relationships (2D and 3D)

List and Matrix operations

Writing script files (a type of Programming)

Symbolic manipulation of Equations

Mathematical Computations

Algorithm development

Modelling, simulation, and prototyping

Data analysis, exploration, and visualization

Scientific and engineering graphics

Application development, including Graphical User Interface building

MATLAB Worldwide Aerospace and Defense Automotive Biotech, Medical, and

Pharmaceutical Chemical and Petroleum Communications Computers and Office Equipment Education Electronics and Semiconductor Financial Services Industrial Equipment and

Machinery Instrumentation Utilities and Energy

Introduction to some basic matrix operators and other tools

• Some important matrix operations

• Introduction to some operators

• Introduction to M-file editor

• Editing and debugging M-files

• Basic plotting functions

• Creating plot

• Editing plot

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Basic Matlab Operations

>> % This is a comment, it starts with a “%”

>> y = 5*3 + 2^2; % simple arithmetic

>> x = [1 2 4 5 6]; % create the vector “x”

>> x1 = x.^2; % square each element in x

>> E = sum(abs(x).^2); % Calculate signal energy

>> P = E/length(x); % Calculate av signal power

>> x2 = x(1:3); % Select first 3 elements in x

2D & 3D Graphics

Introduction The MATLAB environment provides a wide variety of

techniques to display data graphically.

Interactive tools enable you to manipulate graphs to achieve results that reveal the most information about your data.

You can also annotate and print graphs for presentations, or export graphs to standard graphics formats for presentation in Web browsers or other media.

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Creating a Graph The type of graph you choose to create depends on the nature of

your data and what you want to reveal about the data.

You can choose from many predefined graph types, such as line, bar, histogram, and pie graphs as well as 3-D graphs, such as surfaces, slice planes, and streamlines.

There are two basic ways to create MATLAB graphs:

Use the command interface to enter commands in the Command Window or create

plotting programs.

Use plotting tools to create graphs interactively.

Types of MATLAB Plots 2D

2d graphs

Types of MATLAB Plots 3D

3d Graphs

NASA ELECTRON BEAM WELDER

Matlab Simulink

SimulinkIntroduction

Simulink software models, simulates, and analyzesdynamic systems.

It enables us to pose a question about a system, modelthe system, and see what happens.

With Simulink, we can easily build models fromscratch, or modify existing models to meet your needs.

Simulink supports linear and nonlinearsystems, modeled in continuous time, sampled time, or ahybrid of the two.

Systems can also be multirate having different parts thatare sampled or updated at different rates.

Simulink Thousands of scientists and engineers around the world use

Simulink to model and solve real problems in a variety of industries, including:

Aerospace and Defense

Automotive

Communications

Electronics and Signal Processing

Medical Instrumentation

Starting and Running Simulink Type the following at the Matlab

command prompt

>> simulink

The Simulink library should appear

Click File-New to create a new workspace, and drag and drop objects from the library onto the workspace.

Selecting Simulation-Start from the pull down menu will run the dynamic simulation. Click on the blocks to view the data or alter the run-time parameters

Signals and Systems in Simulink

Two main sets of libraries for building simple simulations in Simulink:

• Signals: Sources and Sinks

• Systems: Continuous and Discrete

Basic Simulink Example Copy “sine wave” source and “scope”

sink onto a new Simulink work space and connect.

Set sine wave parameters modify to 2 rad/sec

Run the simulation:

Simulation - Start

Open the scope and leave open while you change parameters (sin or simulation parameters) and re-run

Many other Simulink demos …

Modeling Jaguar

Communication Toolbox

Presentation Outline

Section Overview Expected background from the Users Studying Components of the Communication System BER : As performance evaluation Technique Scatter Plot Simulating a Communication Link….Examples BERTool : A Bit Error Rate GUI

Studying Components of Communication system

We will See for two Types:

Analog Communications

Digital Communications

Analog Communication System

Signal

SourceModulation

De-

Modulation

This may be any analog signal such as Sinewave, Cosine Wave, Triangle Wave………………..

Analog Modulation/Demodulation Functions

ammod Amplitude modulation

amdemod Amplitude demodulation

fmmod Frequency modulation

fmdemod Frequency demodulation

pmmod Phase modulation

pmdemod Phase demodulation

ssbmod Single sideband amplitude Mod

ssbdemod Single sideband amplitude DeMod

Image Processing Toolbox

Images in MATLAB• Binary images : {0,1}

• Intensity images : [0,1] or uint8, double etc.

• RGB images : m-by-n-by-3

• Indexed images : m-by-3 color map

Images and Matrices Accesing image elements

(row, column)

>> A(2,1)

ans = 4

: can be used to extract a wholecolumn or row

>> A(:,2)

ans =2

5

8

or a part of a column or row

>> A(1:2,2)

ans =2

X

Y

A = 1 2 34 5 67 8 9

Flow Control Flow control in MATLAB

- for loops

for row=1:3

for col=1:3

if row==col

A(row, col)=1;

elseif abs(row-col)==1

A(row, col)=2;

else

A(row, col)=0;

end

end

end

A =

1 2 02 1 20 2 1

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