1. Basics of MATLAB By DR. Wafaa Shabana

2. Table of Contents: 1. What is MATLAB? 2. Why MATLAB?
3. Is MATLAB a compiled language?
4. MATLAB toolboxes.
5. How to start and quit MATLAB?
6. MATLAB command window.
7. Getting starting with MATLAB.
8. Graphs
9. Questions
10. References

3. 1.What is MATLAB?
MATLAB is a high-performance language for technical computing.
It integrates computation, visualization, and programming in an easy-to-use environment where problems and solutions are expressed in familiar mathematical notation.
MATLAB is one of the fastest and most enjoyable ways to solve problems numerically.

4. 1. What is MATLAB?(continued)
MatLab : Matrix Laboratory
Numerical Computations with matrices
Every number can be represented as matrix
Matlab is an interactive program for numerical computation and data visualization;
MATLAB is a product of The MathWorks, Inc.
- The MathWorks is the leading developer of mathematical computing software for engineers and scientists since 1984.

5. 2. Why MATLAB? Main Features Simple programming rules
Extended accuracy
Comprehensive mathematical library
Extensive graphics tools for 2D and 3D graphics
Linkages with other languages
Transportability across environment
MATLAB scripts will work on PC, UNIX, Mac

6. 2. Why MATLAB? (continued)
Mathematical functions for linear algebra, statistics, Fourier analysis, filtering, optimization, and numerical integration
2-D and 3-D graphics functions for visualizing data
Tools for building custom graphical user interfaces
Functions for integrating MATLAB based algorithms with external applications and languages, such as C, C++, Fortran, Java™, COM, and Microsoft® Exce

7. 2. Why MATLAB? (continued)
MATLAB is useful for visualization and data analysis
MATLAB is versatile, designed to work the same across platforms and to interface with multiple programming languages
MATLAB is expandable with toolboxes
User Friendly (GUI)
Easy to work with
Powerful tools for complex mathematics
Note that: With the MATLAB language, you can program and develop
algorithms faster than with traditional languages because you do not need to perform low-level administrative tasks, such as declaring variables, specifying data types, and allocating memory.

8. 3. Is MATLAB a compiled language?
MATLAB is an interpreted language
It is not a compiled language
Question:
1- What is the difference between a compiled and interpreted language?
Give an example for each.

9. 4. MATLAB toolboxes: Signal Processing toolbox
Image processing toolbox
Database toolbox
Wavelets toolbox
Partial Differential equation toolbox
Fuzzy logic
Neural Network toolbox
Financial toolbox
Communications toolbox
Bioinformatics toolbox
Statistics toolbox
Optimization toolbox

10. 5. How to start MATLAB?
On Microsoft Windows® platforms, start the MATLAB program by double-clicking the MATLAB shortcut on your Windows desktop.
On Apple® Macintosh® platforms, start MATLAB by double-clicking the MATLAB icon in the Applications folder.
On UNIX® platforms, start MATLAB by typing matlab at the operating system prompt.

11. 6. MATLAB command window:
Main window in MATLAB
Commands entered here
MATLAB displays >> prompt when ready for a command
Will have no >> prompt when processing commands

13. Workspace Window Workspace Window
Shows all currently defined variables
Array dimensions
Min, max values
Good debugging tool

14. Command History Command History Shows all past commands
Can copy and past commands into command window
Double click will execute command

15. 7. Getting Started with MATLAB:
MATLAB is case sensitive
Variable ‘ans’ will take value of result of command if no equal sign specified
Holds most recent result only
Semicolon at end of line will suppress output, it is not required like in C or C++
Useful in script files and debugging

16. 7.1 Mathematical operators:
Scalar arithmetic operations
Operation MATLAB form
Exponentiation: ^ ab a^b
Multiplication: * ab a*b
Right Division: / a / b = a/b a/b
Left Division: \ a \ b = b/a a\b
Addition: a + b a+b
Subtraction: a – b a-b
e.g
2^6*3+4-6 =(( ((2^6)*3)+4)-6)

17. 7.2 Logical operators:

18. 7.3 MATLAB help: Ways to get help in MATLAB help function name
Provides basic text output
Type helpwin on command line
Look under the help menu on the desktop

19. 7.3 MATLAB help: lookfor keyword command will also find functions that
have the keyword in them
doc function_name
brings up the full documentation for the function

20. 7.4 Matrices in MATLAB:
You can enter matrices into MATLAB in several different ways:
Enter an explicit list of elements.
Load matrices from external data files.
Generate matrices using built-in functions.
Create matrices with your own functions in M-files.

21. As a list of its elements:
Separate the elements of a row with blanks or commas.
Use a semicolon, ; , to indicate the end of each row.
Surround the entire list of elements with square brackets, [ ].
simply type in the Command Window
A = [ ; ; ; ]

22. The element in row i and column j of A is denoted by A(i,j).
Some basic functions for matrices:
sum(A)
A‘: transpose (A)
diag(A),
inv(A),
ones(N),
zeros(N),
A*B, A.*B

23. The Colon Operator:
The colon, :, is one of the most important MATLAB operators. It occurs in several different forms.
For example:
1:10
To obtain non-unit spacing, specify an increment.
100:-7:50
and
0:pi/4:pi

24. Subscript expressions involving colons refer to portions of a matrix:
A(1:k,j)
is the first k elements of the jth column of A.
A(: , i)
All elements in the ith column

25. 8. Graphs
t = 0:pi/20:2*pi; y = exp(sin(t)); plotyy(t,y,t,y,'plot','stem') xlabel('X Axis') ylabel('Plot Y Axis') title('Two Y Axes') % comment % plotyy :2-D line plots with y-axes on both left and right side

26. Subplots
You can place more than one plot on a figure using the subplot function. The function takes three arguments.
subplot(n_rows, n_cols, which_plot)
n_rows and n_cols serve to divide the figure into fields.
The fields are numbered from left to right and then up to down.
which_plot tells which field to place a plot.

27. >> x=0:0.002:100;
y1=log(x+1);
y2=cos(x);
y3=sin(x);
y4 = 10*x+5;
>> subplot(2,2,1)
>> plot(x,y1), title('y=log(x+1)')
>> subplot(2,2,2)
>> plot(x,y2), title('y=cos(x)')
>> subplot(2,2,3)
>> plot(x,y3), title('y=sin(x)')
>> subplot(2,2,4)
>> plot(x,y4), title('y=10x+5')
figure
plot(x(1:20000),y2(1:20000))

28. 9. Questions? What is an OSS? Is MATLAB an OSS?
Give an example of an OSS?
Further Questions:

29. 10. References: You can read the following references:
1- “The Basics of MATLAB” Jeffrey O. Bauer 2-
3. “MATLAB tutorial for beginners” Jyotirmay Gadewadikar
Need further help?
Contact me 

30. Thanks for your attendance and hope you have not wasted your time.