about Matlab

1. Introduction to
MATLAB
Chris Diduch
University of New Brunswick
January 31 – February 4, 2004
Royal Bhutan University
RBIT, Rinchending
Day-1

2. Who is your instructor?
Chris Diduch
Professor
Electrical and Computer Engineering
University of New Brunswick
Fredericton, Canada, E3B 5A3
diduch@unb.ca

3. Research Interests
 Control systems,
 Computer control systems
 Failure detection and isolation
 Embedded and real time systems
 Applications: control of electric drives,
robotics, injection molding machines,
distributed power systems.

4. Courses
 Electricity and magnetism, circuits, systems
dynamics, microprocessors, embedded systems
and digital interfacing, robotics, real time
systems, VLSI design
 Advanced control systems, computer control
systems

5. What is MATLAB?
 MATrix LABoratory
 Originated as a vehicle for teaching and applying
linear algebra and numerical methods.
 Rapid analysis, design and prototyping.
 Arrays are the basic data type.
 Built-in functions are optimized for vector operations.
z=x*y z=[]
for i=1:5
z=z+x[i]*y[i]
end

6. MATLAB
MATLAB Toolboxes
Signal Processing
Neural Networks
Communications
Image Processing …
Programming
Language
Graphics
2D
3D
Color
Lighting
Animation…
External Files
Fortran and C…
Computation
Linear
Algebra
Data Analysis
Sig Process
Polynomials
Integration
ODE's …
3rd Party
Toolboxes
Robotics
Robot
Vision …
Physical IO
Analog
Digital …
Simulink
Stateflow
RT Workshop
Data Acquisition
xPC Target
Built-in Functions User-written Functions

7. Features of MATLAB
 The MATLAB programming language
 Built-in MATLAB functions
 Graphics
 Linear algebra
 Data analysis
 Signal processing
 Polynomials and interpolation
 Numerically solving differential equations
 External interfaces: C, Fortran

8. The Student Edition of
MATLAB
 MATLAB Toolboxes
 Simulink
 Signal Processing Toolbox
 Symbolic Math Toolbox
 Where Do I Get MATLAB? On-line Help?
www.mathworks.com

9. MATLAB Windows
 Launchpad Window (I call it the MATLAB
window)
 Command Window
 Workspace Window
 Command History Window
 Current Directory Window
 Edit Window
 Graphics Window

10. Help and Assistance
 command lookfor
 command help
 command helpwin
 command helpdesk
 command demo

11. MATLAB Data Types
 Basic type is the array
 Dimensioning is automatic
 Data objects:
 integers
 double
 matrices
 character (or text) strings
 structures
 cells

12. Display and Formatting
 MATLAB is case sensitive
 A semi-colon at the end of a line suppresses
screen output
 To display one page at a time type more on
 Display formats:
 short
 long
 e, g, hex
 rat, bank

13. MATLAB File Types
 M-files: scripts and functions are saved as
text files with a .m extension
 Mat-files: workspace variables are saves as
binary files with a .mat extension.
 Mex-files: MATLAB callable Fortran and C
programs with a .mex extension.
 Fig-files: the saved form of a figure window.

14. Where do we use MATLAB?
 Linear Algebra MATH 1503
 Simulation & Analysis CMPE 2013
 Systems and Control EE 3313, EE 3323
 Signals EE 3513, Industrial Control EE 4343
 Robotics EE 4353
 Power Systems EE 4411
 Algorithms in Real Time CMPE 4543
 Research and Graduate courses

15. On-line Help
 help FunctionName or ScriptName
 help help
 lookfor Name
 demo
 helpwin
 helpdesk

16. Overview
 MATLAB windows and basic operations
 Programming in MATLAB
 Analysis
 Graphics
 Toolboxes

17. On-line Course Material
 The workbook and all of the program
examples are available on-line at:
 http://www.ece.unb.ca/Courses/Matlab/CD

18. Element-by-Element
Operations
 Use dot operation for element-by-element
operations
 .* ./ .^
 A = [a1 a2 a3]
 B = [b1 b2 b3]
 C = A .op B says
 C= [a1 op b1, a2 op b2, a3 op b3]

19. Syntax
 sin2(t) sin(t)^2

20. Matrices











)
4
,
3
(
)
3
,
3
(
)
2
,
3
(
)
1
,
3
(
)
4
,
2
(
)
3
,
2
(
)
2
,
2
(
)
1
,
2
(
)
4
,
1
(
)
3
,
1
(
)
2
,
1
(
)
1
,
1
(
A
A
A
A
A
A
A
A
A
A
A
A
A
Column
Row

21. Trajectory of a Projectile
θ
H
y
x
v0
v(t)

22. MATLAB Path and PWD
 PWD: present working directory
 Default is: /matlab/path
 The MATLAB path:
 All MATLAB directories are included in the
search path.
 You may add paths to your directories

23. For First Time Users
 Issues
 Not being in the right directory
 Not saving files in the right directory
 Not updating an existing function or script file
while editing.
 Default working directory is
…/MATLAB/WORK