MATLAB Windows, Basic MATLAB functions,SIMULINK,Development Tools

1. Introduction to MATLAB
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Mrs.G.Kalaiarasi
Associate Professor
Department of ECE
Jai Shriram Engineering College
Tirupur

2. INTRODUCTION
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 Cleve molar in 1984, Mathworks
inc
 Introduced as a simulation tool
 Supports Graphical Programming
 Can be interfaced with other High
Level languages

3. WHAT IS MATLAB?
MATLAB is a program for doing numerical computation. It
was originally designed for solving linear algebraic type
problems using matrices. It’s name is derived from MATrix
LABoratory
Difference between C and Matlab
Inbuilt Functions in Matlab (Application Oriented)
User friendly syntax
Fourth generation Programming Language tool
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4. FEATURES
MATLAB is a software package for high performance
numerical computation and visualization
Manipulating and plotting data
Especially large data sets
Scientific computing
Dynamic system modeling
System design
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5. FEATURES
cont..
MATLAB provides an interactive environment with
hundreds of reliable and accurate built-in mathematical
functions
Mathematical problems including matrix algebra, complex
arithmetic, linear systems, differential equations, signal
processing, optimization, nonlinear systems, etc.,
The most important feature of MATLAB is its programming
capability, which is very easy to learn and to use, and also
allows user-developed functions
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6. MEMORY ALLOCATION
No need for types. i.e.,
All variables are created with double precision unless
specified and they are matrices.
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int a;
double b;
float c;
Example:
>>x=5;
>>x1=2;

7. DEVELOPMENT TOOLS
MATLAB Editor
Code Analyzer
MATLAB Profiler
Directory Report
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8. EDITOR WINDOW
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Click to
create a new
M-File
 Extension “.m”
 A text file
containing script or
function or
program to run
edit<space> <function name>
• To understand the code sequence
• Editing can‘t be done for some Functions

9. USER DEFINED FUNCTION
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10. CODE ANALYZER
• It helps in debugging the error
• Types of errors
1. Functional error
linespace instead of linspace
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Error
How to
Avoid?
Functional Error

11. CODE ANALYZER
2. Syntax Error
imread(“___”) instead of imread(‘___’)
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Error
How to
Avoid?
Contd…

12. CODE ANALYZER
3. Logical Error
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Contd…
User should handle this kind of logic errors

13. SIMULINK
SIMULINK is a graphical mouse-driven program for
the simulation of dynamic systems.
SIMULINK enables students to simulate linear, as
well as nonlinear, systems easily and efficiently.
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14. AND OPERATION
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Text Based
 A=1
 B=0
 M=A&B
 R=A|B
SIMULINK

15. MATLAB WINDOWS
Command window
Figure window
Editor window
Help window
Workspace window
Current directory window
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16. MATLAB WINDOWS
• Command Window
– type commands
• Current Directory
– View folders and m-files
• Workspace
– View program variables
– Double click on a variable
to see it in the Array Editor
• Command History
– view past commands
– save a whole session
using diary
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17. MATLAB as a calculator
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BASIC MATLAB FUNCTIONS

18. VECTORS
a = [1 2 3 4 5 6 9 8 7] ;
t = 0:2:20
t = 0 2 4 6 8 10 12 14 16 18 20
b = a + 2
b = 3 4 5 6 7 8 11 10 9
c = a + b
c = 4 6 8 10 12 14 20 18 16
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19. MATRICES
B = [1 2 3 4;5 6 7 8;9 10 11 12] ;
B = 1 2 3 4
5 6 7 8
9 10 11 12
C = B'
C = 1 5 9
2 6 10
3 7 11
4 8 12
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20. BASIC MATRIX OPERATORS
X = inv(E) ;%INVERSE OF THE MATRIX
[A,H] = eig(E) %eigen value &vector
p = poly(E) %polynomial
c = abs(y) ;
D=min(a);
D=max(a);
Convolution
x = [1 2];
y = [1 4 8];
z = conv(x,y)
[xx, R] = deconv(z,y)
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21. PLOT
t=0:0.25:7;
y = sin(t);
plot(t,y) ;
xlabel('x axis');
ylabel('y axis');
title('Heading');
grid on;
gtext('text');
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22. AN AUDIO AND VIDEO FILE
a =wavread('test.wav');
wavplay(a,44100);
Plot(a);
a=aviread('movie.avi')
movie(a);
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23. Conserve our forests, wildlife and the water
bodies
to Save our MOTHER EARTH
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