Created by :- Master Team

Outline What is MATLAB.

MATLAB Interface

MATLAB as programming language. Arrays in MATLAB.

Basic operations.

Some Built-in functions.

Loops and Conditions.

Graphics in MATLAB.

Image in MATLAB

MATLAB Help

What is MATLAB

High –level, data structured, technical computing programming language.

Stands for Matrix Laboratory.

The basic data type is the Array (every thing is a matrix)

Scale n=1 is 1 x 1 array.

Vector a = [1 2 3] is 1 x 3 array (1-Dim).

Matrix A = [1 2 3 ; 4 5 6] is 2 x 3 array (2-Dim).

Used in linear algebra, graphic, image, simulation,.. Etc

MATLAB Interface

MATLAB Interface Menu bar.

Tool bar.

Command window.

Command History.

Current directory.

Workspace.

MATLAB as programming language Like any other programming language MATLAB

contains variables , functions , loops , conditions ,,, And so on.

As any other programming language , MATLAB can call function of another language , and Also MATLAB ’s functions can be called by any language.

Arrays in MATLAB >> A = [1 2 3]

output is A = 1 2 3

>> A = [1 2 3];

output is null

( ; ) means execute without displaying output

Arrays in MATLAB Matrix is 2-D array.

Vector is special case of matrix -Vertical vector is m x 1 matrix - Horizontal vector is 1 x n matrix

>> A = [1; 2; 3] A = 1 >> A = [1 2 3] A = 1 2 3

2

3

Scale number is special case of vector

-scale is 1 x 1 vector

>>B = 5

Basic operations ^: exponentiation

*: multiplication

/: division

\: left division. The operation A\B is effectively the same as

INV(A)*B, although left division is calculated differently and is

much quicker.

+: addition

-: subtraction

Some Built-in functions

zeros(m,n) ones(m,n) eye(n)

>>a=zeros(2,3) >> a=ones(3,2) >> eye(2)

a = 0 0 0 a = 1 1 a = 1 0

0 0 0 1 1 0 1

1 1

Some Built-in functionsrand (m,n) magic (m)

mean (A) median (A)

min (A) max (A)

sum (A) sort (A)

dot (a,b) cross (a,b)

inv (A) length (A)

disp (A) load (A)

For more functions back to MATLABE Help

Loops and Conditions >>for i = 1:2 >> for I = 5:-2:1, I, end

i

end

Output Output

I = 1 I = 5

I = 2 I = 3

I = 3 I = 1

Loops and Conditions >> n=3; >>n=0;

while n > 0 done = 0;

n = n - 1 while ~done

end n = n+1

if n >= 3, done = 1; end

end

Output Outputn= 2 n= 1

n= 1 n= 2

n= 0 n= 3

Loops and Conditions>> n = 3;

if n > 0 output

disp('Positive value.')

elseif n < 0 Positive value

disp('Negative value.')

else

disp('Zero.')

end

Graphics in MATLAB As soon as graphs can represented by vectors, can be

manipulated by MATLAB like a normal vectors

>> x = [1 2 3 4];

>> y = [2 4 6 8];

>>title('Figure 1');

>>plot(x,y);

Image in MATLAB As soon as images can represented by matrices, can be

manipulated by MATLAB like any other matrix.

>> x = imreade(' kids.tif ');

>>[x map] = imreade(' kids.tif ');

>>imshow(x);

>>imshow(x , map);

>>imwrite(x , ' c:\img.png ' , 'png');

Image in MATLAB To convert between different image types:-

x=imread(‘cameraman.png’);

Y=gray2rgb(x);

Y=rgb2gray(x);

Y=rgb2ind(x);

Y=ind2rgb(x);

Y=ind2gray(x);

Y=gray2ind(x);

Image in MATLAB To rotate an image :-

X=imread(‘cameraman.png’);

y=imrotate(x,65,0);

degree of rotation

MATLAB Help For more functions, liberaries and any other

information you can get it from MATLAB help

Getting the help :-

>>Desktop >> help.

>>Help >> Product help.

F1.