Introduction to matlab

Introduction to MATLAB


Dr. Mohammad [email protected]


In this workshop we will cover the following

• Using Matlab as a numerical calculator• Entering row vectors and column vectors• Entering matrices• Forming matrix and vector products• Doing matrix products, sums etc• Using Matlab to solve linear equations• Matlab functions that operate on arrays• Plotting basic graphs using Matlab.


Resources on the ‘K:’ drive

• Now, you may find some books and notes about MATLAB for beginners and for experts on the ‘K:’ drive under the folder name “MATLAB E-Books”


What is MATLAB ?

MATLAB started as an interactive program for doing matrix calculations and has now grown to a high level mathematical language that can solve integrals and differential equations numerically and plot a wide variety of two and three dimensional graphs. MATLAB also contains a programming language.


How to get started?

Command WindowWork Space

Command History


Simple arithmetic with Matlab


Simple arithmetic with Matlab


Try These!


The order of operations

• If you are using brackets, that will save you a lot of effort!

• However, the operators have precedence!1. “( )” brackets2. “^” Power3. “* /” Multiplication and division4. “+ -” Addition and subtraction


Variable names

• Variable may have names that consist of characters and digits, but they can not start with a number!

• Matlab distinguishes between lower and upper cases - so A and a are different objects

• Only the first 19 characters in a variable name are important.


Try this!

• You have just created two vectors, x & y!• Now try some operations on them! (multiply

by a constant, use sin(x), sqrt(x), exp(x), …


Try this!


This is your first plot!


How about this?


Now, you know how to create a plot of your data!


Matrix Operations

• Try these:


Another way of creating a vector

• You may try to multiply, add, or invert those matrices!


Matrix Inversion

• Matrix inversion is performed using the function:inv();


What variables have you defined already ?

• Also try the commands: who & whos


More Matrix Operations

• Try these:


More Matrix Operations


Special Matrices!


Solving Equations!

• Now we may use the tools we have to solve a system of equations!

• If we have the equations:

• Just transform it into matrix form!632

892

735

zyx

zyx

zyx


Here is how!


Or Even Easier!!!

• Actually, if you are solving a large system of equations, this operator is MUCH faster!


The last function for today!

• Timing function:tic … toc

• Tic: starts the timer• Toc: stops the timer and gives you the time in

seconds!


More topics!

• Complex numbers• Working with files• More graphics• Programming• Symbolic Operations

Introduction to matlab

Education

matlab introduction

matlab ebooks

matlab resources

matlab matrix operations

matlab simple arithmetic

matlab special matrices

matlab variable names

matrix products