1. Interduction to MATLAB Manal Alotaibi Mathematics department College of science King saud university

2. Content MATLAB  What is MATLAB?  The MATLAB desktop invironment.  MATLAB as calculator.  Variables.  Algorithm  Interduction to m-file function.

3. Outline MATLAB  What is MATLAB?  The MATLAB desktop invironment.  MATLAB as calculator.  Variables.  Algorithm  Interduction to m-file function.

4. MATLAB is a mathematical and graphical software package with numerical, graphical and programming capabilities. it has built-in functions to perform many operations. MATLAB

5. Outline  What is MATLAB?  The MATLAB desktop invironment.  MATLAB as calculator.  Variables.  Algorithm  Interduction to m-file function. MATLAB

7. Command window: Type your instructions here and press ENTER to execute them. MATLAB

8. Example: Declare a column matrix with values 1,2 and 3. MATLAB

9. Command history: a list of instructions executed by MATLAB is shown here. MATLAB

10. Workspace: shows a list of variables created by MATLAB. As you can see, the value of ‘aaa’ is shown. MATLAB

11. Another way to create a variable Is to press this button. MATLAB

12. MATLAB will prompt you to enter the variable name. MATLAB

13. As you can see, the variable name has been changed to bbb. MATLAB

14. To assign a value to bbb, you can do it in two ways: 1) Using the command window. 2) Or by double clicking on bbb. MATLAB

15. To clear all variables from memory and close all figures, use the clear, close all command. MATLAB

16. As you can see, all workspace variables are deleted when you execute this command. MATLAB

17. To clear the command window, use the clc (clear console) command. MATLAB

18. As you can see, all console entries are deleted when you execute this command. MATLAB

19. If you want to see help, you can type help at the command window. MATLAB

20. Outline  What is MATLAB?  The MATLAB desktop invironment.  MATLAB as calculator.  Variables.  Algorithm  Interduction to m-file function. MATLAB

21. Operators + addition + a+b - subtraction- a-b * multiplication* a*b / Division(left) / a/b \ Division(right)\ a\b (b  a) ^ power^ a^b MATLAB

22. Operator precedence rules 1.() parentheses. 2.^ power. 3.- negation. 4.*/ \ all multiplication and division. 5.+ - addition and subtraction. MATLAB

23. Examples >> 6*5 ans = 30 >> 17/5 ans = 3.4000 >> ans ans = 3.4000 >> 6*5 ans = 30 >> 17/5 ans = 3.4000 >> ans ans = 3.4000 >> x=6*5 x= 30 >> y=17/5; >> y y= 3.4000 >> z=x+y z= 33.4000 >> who Your variables are: xyz >> x=6*5 x= 30 >> y=17/5; >> y y= 3.4000 >> z=x+y z= 33.4000 >> who Your variables are: xyz MATLAB

24. Some functions in MATLAB exp(x) e x sin(x) sin x asin(x) sin -1 x log(x) ln x log10(x) log x sqrt(x) abs(x) |x| sum(x) pi  i,j imaginary unit NaN Not-a-Number  Inf  MATLAB

25. Example >>y=x^0.5; >>y=x^(1/2); >>y=sqrt(x); MATLAB

26. Outline  What is MATLAB?  The MATLAB desktop invironment.  MATLAB as calculator.  Variables.  Algorithm  Interduction to m-file. MATLAB

27. Variables Creating Variables: – Names Can be any string of upper and lower case letters along with numbers and underscores but it must begin with a letter Reserved names are IF, WHILE, ELSE, END, SUM, etc. Names are case sensitive – Value This is the data the is associated to the variable; the data is accessed by using the name. – Variables have the type of the last thing assigned to them Re-assignment is done silently – there are no warnings if you overwrite a variable with something of a different type. MATLAB

28. Outline  What is MATLAB?  The MATLAB desktop invironment.  MATLAB as calculator.  Variables.  Algorithm  Interduction to m-file MATLAB

29. Definition of algorithm An algorithm is the sequence of steps needed to solve a problem. MATLAB

30. Outline  What is MATLAB?  The MATLAB desktop invironment.  MATLAB as calculator.  Variables.  Algorithm  Interduction to m-file. MATLAB

31. To create an m-file, 1) type edit at the command window, or 2) Press this button. MATLAB

32. The previous command will display the editor window. The editor creates an m-file that can be used to write your MATLAB programs. MATLAB

33. To execute a program, press the RUN button. MATLAB

34. End the first part