ch 2 getting started with matlab

7/29/2019 Ch 2 Getting Started With MATLAB

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Chapter 2:

Getting Started withMATLAB

MATLAB

for Scientist and Engineers

Using Symbolic Toolbox



You are going to

Familiarize yourself with MATLAB desktop, See how simple it is to use MATLAB, yet

powerful,

Express simple math expressions in MATLAB

tongue,

Solve mathematical problems using MATLAB,

And finally, be glad to know MATLAB is with you.

2



Starting MATLAB

Start – All Programs – MATLAB – R2009b … Create your own work space.

Customize the startup script.

3

Create a new folder under c:\c:\workM

edit 'startupsav.m' save as 'startup.m'

startup.m

cd c:\workM

disp(['MATLAB v' version]);



Overview of MATLAB Desktop

4

Command Window

Editor Workspace

Command History

Window

CurrentFolder

Content

Browser

Show how to use Desktop.



Test Ride of MATLAB: bench

Type bench in the command window.

5



Getting Started with MATLAB

Through the demonstration, you will be able to do simple arithmetic operations

generating arrays using : operator

disable output using ;

entering matrices

use help systems

display the size of matrices

perform matrix operations

selecting part of matrices

plotting matrices

6Show demo: getting_started_with_matlab.m



Working in the Desktop

Through the demonstration, you will be able to calculate values for a function

plot the results

edit the previous commands

display the variables using whos

modify variables directly using variable editor

plot data at workspace browser

save and load part / all of the variable

adjusting window layouts

docking/undocking

7Show demo: working_with_ide.m



Match the pairs.

Quiz: MATLAB Windows

8

Main window, enters variables,

runs programs.

Logs commands entered in the

Command window.

Shows the files in the current

directory.

Creates and debugs script and

function files.

Command Window

Editor Window

Command History

Window

Workspace Window



MATLAB is a Very Good Calculator!

Write down the answers.

9

-4 + 7 * ( 2 - 5 ) / 3.14 7 2 5

43.14

2^3 - sqrt(25) + exp(3) 3 32 25 e

2.51e3 + 2/3*pi 3 12.51 10 2

3

MathematicalExpressions

MATLABExpressions

YourAnswers

(2+3*i)*(1-2*i)^2 2

(2 3 ) 1 2i i



Basic Math Expressions

2.1+3 cos log round nchoosek min

98-3.2 acos log10 rem besselj max

-67*34 cosd sqrt mod beta size

81/8 acosd abs factor erf primes

7.1^4 cosh angle isprime erfc gcd

1.2e3 acosh conj primes gamma lcd

3+4*i tan imag gcd legendre mean

pi atan2 real lcm factorial roots

eps asin floor rat sum poly

exp asind ceil perms prod conv

10



Exercise: Math Expressions

Evaluate the following expressions when x = 1.25

11

2 3310log x x

34 tan ln6

x x x e

2

3

sin ( / 6)23 2010

9 652 x

>>

>>

>>



Exercise: Geometry

Find the volume of the oil tank below.

12

MATLAB Expression

20m

ANS

24m



Variables

Assign the results into variables.

13

x = 3^4 + 27^(1/3) 4 33 27 x

y = (2+3i)*(1-2i) (2 3 )(1 2 ) y i i

z = sqrt( x^2 + y^2 ) ; 2 2 z x y

Do not print the answer!



Workspace Variables

Variables live in the MATLAB workspace.

14

>> x = 3^4 + 27^(1/3)

x =

84

>> y = (2+3i)*(1-2i);

>> z = sqrt( x^2 + y^2 );>> who

Your variables are:

ans x y z

>> clear

>> who

>>

who

who a*

whos

clc

List variable names.

List variable names

beginning with a.

List variable in long

format.

Clear command window.

clear Clear variables from

memory. help doc

what



Exercise: Geometry & Trigonometry

Find the distance between C2 and C4.

15

1C

2C

3C

4C

1

2

3

4

16

6.5

12

9.5

R mm

R mm

R mm

R mm

a

b

c

2 2 2 2 cosc a b ab

Hint: Use the following identity.



Exercise: Your Solution

Mathematical Expressions

MATLAB Expressions

Your Answer:

16



Key Takeaways

Now, you know how to customize the MATLAB startup script.

use the MATLAB desktop windows.

change the layout of the desktop windows. evaluate mathematical expressions.

17



Q & A

18

ch 2 getting started with matlab

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