Intro. on MATLAB
Intro. to MATLABBy Hisham AbuellaTA & RA in ECE @ Istanbul
ehir UniversityEmail : [email protected]
OutlineWhere to use MATLAB ?What is Matlab & Why use it
?MATLAB DesktopExercise 1Matrices & VectorsExercise 2 Useful
Sites
Where to use MATLAB ?Dealing with Matrices and Arrays2-D and 3-D
Plotting and graphicsLinear AlgebraAlgebraic
EquationsStatisticsData AnalysisCalculus and Differential
EquationsNumerical CalculationsIntegrationTransformsCurve
FittingWhat is Matlab & Why use it ?
Stands for MATrix LABoratoryInterpreted language (Line by
Line)Scientific programming environment ( cos , sin , ....)Very
good tool for the manipulation of matrices ( rank , inv ....)Great
visualisation capabilities ( plot , stem ....)Loads of built-in
functions ( Use help you will be surprised...) Easy to learn and
simple to use ( Use help of matlab + lot of online examples
....)
MATLAB Desktop1- Command Window2- Command History3- Workspace4-
Current Directory
How you will work on matlab this session ?1- Is the matlab
installed on your computer ? search for matlab ...
2- Use http://www.tutorialspoint.com/matlab/try_matlab.php 01
The MATLAB desktophttps://youtu.be/PfklSSxZSZU?t=43s
Exercise 1
Solutions to Exercise 1https://youtu.be/rZuAns0iEt4?t=20s
Matrices & Vectors - INearly every thing in MATLAB is in
matricesEasy to define: >> A = [16 3; 5 10] A = 16 3 5 10 Use
, or to separate row elements use ; to separate rows Try the same
line without the semicolon and comments
Access elements of a matrix >>A(1,2) ans= 3 Remember
Matrix(row,column)
Matrices & Vectors - IIVectors - special case - n = 1 column
vectorm = 1 row vector The : operatorVERY important operator in
MatlabMeans to>> 1:10ans = 1 2 3 4 5 6 7 8 9 10 The :
operator and matrices For Matrix
>>A(3,2:3)ans = 1 7>>A(:,2)ans = 2 1 1Whatll happen
if you type A(:,:) ?
Creating Vectors1- Create vector with equally spaced intervals
x=0:0.5:pi2- Create vector with n equally spaced
intervalsx=linspace(0, pi, 7)
Note: MATLAB uses pi to represent , uses i or j to represent
imaginary unit
Creating Matriceszeros(m, n): matrix with all zerosones(m, n):
matrix with all ones. eye(m, n): the identity matrix randn(m, n):
normally distributed randomOperations can be done :+: addition -:
subtraction ^: exponentiation *: multiplication /: division
Manipulating VectorsEvaluated element by element.' : array
transpose (non-conjugated transpose).^ : array power .* : array
multiplication ./ : array division
Manipulating MatricesTry These : >> A '% transpose -For :
&>> B*A % matrix multiplication>> B.*A% element by
element multiplication>> A\B % left division same as INV(A)*B
>> B/A % matrix division>> B./A % element by element
division>> [B A]% Join matrices (horizontally)>> [B;
A]% Join matrices (vertically)>> A-B % Subtract B from
A>> A^2 % calculate A square
B = -1 3 1 4 6 8 2 0 2
A = 4 2 1 5 4 -1 2 0 7
Some Built-in functionsmean(A):mean value of a vectormax(A), min
(A): maximum and minimum. sum(A): summation.sort(A): sorted
vectormedian(A): median valuedet(A) : determinant of a square
matrix Inv(A): Inverse of a matrix A
Exercise 2
Exercise 2 (Continue)
Hint : use A\B Solutionshttps://youtu.be/pTdkD1UpGjU?t=28s
HW
Useful
Siteshttp://www.see.ed.ac.uk/teaching/courses/matlab/http://www.tutorialspoint.com/matlab/matlab_overview.htmhttp://www.mathworks.com/help/matlab/index.htmlhttp://www.mathworks.co.uk/matlabcentral/
Next session ...Plots in Matlab Try: stem , plot
......Relational & Logical Operators Try: && > ==
||.....If-Else Statement For LoopsWhile Loops Functions and
Scripts
