1. Presented By:
Maria Akther
ID:083-20-119
Dept. : Computer Science
Daffodil International University

2. MATLAB

3.  Matlab introduction
 Matlab elements
 Variables
 Matrices
 Loading, saving and plotting
 Matlab Programming language
 Some functions

4.  Matlab is a program for doing numerical
computation. It was originally designed for
solving linear algebra type problems using
matrices. It’s name is derived from MATrix
LABoratory.
 Matlab is also a high level programming
language that currently is widely used as a
platform for developing tools for Machine
Learning.

5.  Some other aspects of Matlab
-Matlab is an interpreter -> not as fast as
compiled code
-Typically quite fast for an interpreted
language
-Can be linked to C/C++, JAVA, SQL etc
-Commercial product, but widely used in
industry and academia
-Many algorithms and toolboxes freely
available

6. Advantages of MATLAB:
-Easy to use
-Predefined Functions
-Plotting
Disadvantages of MATLAB:
- Can be slow
- Commercial Software.

7.  Command Window
type commands
 Workspace
view program
variables
double click on a
variable to see it in the
array Editor.
 Command History
view past commands

8.  Have not to be previously declared
 Variable names can contain up to 63 characters
 Variable names must start with a letter followed
by letters, digits, and underscores.
 Variable names are case sensitive.

9.  ans Default variable name for results
 pi Value of π
 inf Infinity
 NaN Not a number e.g. 0/0
 realmin The smallest usable positive real
number
 realmax The largest usable positive real
number

10.  Assignment = a = b (assign b to a)
 Addition + a+b
 Subtraction - a -b
 Multiplication * or .* a*b or a.*b
 Division / or ./ a/b or a./b
 Power ^ or .^ a^b or a.^b

11.  Matlab treats all variables as matrices. A
matrix can be thought of as an array, in fact,
that is how it is stored.
 Vectors are special forms of matrices and
contain only one row OR one column.
 Scalars are matrices with only one row AND
one column
 A matrix with only one row is called a row
vector. A row vector can be created in
 Matlab as follows (note the commas):
» rowvec = [12 , 14 , 63]

12.  A matrix with only one column is called a column
vector. A column vector can be created in MATLAB
as follows (note the semicolons):
» colvec = [13 ; 45 ; -2]
 A matrix can be created in Matlab as follows (note
the commas AND semicolons):
» matrix = [1 , 2 , 3 ; 4 , 5 ,6 ; 7 , 8 , 9]

13.  t =1:10
t=
1 2 3 4 5 6 7 8 9 10
 k =2:-0.5:-1
k=
2 1.5 1 0.5 0 -0.5 -1

14.  x = [1 2], y = [4 5], z=[ 0 0]
 A = [ x y]
1 2 4 5
 B = [x ; y]
12
45

15.  Matlab has a lot of function for plotting data. The basic
one will plot one vector vs. another. The first one will
be treated as the abscissa (or x) vector and the
second as the ordinate (or y) vector. The vectors have
to be the same length.
>> plot (time, dist) % plotting versus time

16.  Create an x-array of 100 samples between 0 and 4π.
 Calculate sin(.) of the x-array
 Plot the y-array

17.  title(.)
 xlabel(.)
 ylabel(.)

18. Signal Processing Toolbox™ provides industry-standard algorithms
for analog and digital signal processing (DSP). We can use the
toolbox to visualize signals in time and frequency domains, compute
FFTs for spectral analysis, design FIR and IIR filters, and implement
convolution, modulation, re-sampling, and other signal processing
techniques. Algorithms in the toolbox can be used as a basis for
developing custom algorithms for audio and speech processing,
instrumentation, and baseband wireless communications.

20.  Within Matlab
Type help at the Matlab prompt or help followed by a
function name for help on a specific function
 Online
Online documentation for Matlab at the
MathWorks website
http://www.mathworks.com/access/helpdesk/help/techdoc/matlab
.html