00 getting started with matlab

8/12/2019 00 Getting Started With Matlab

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Getting Started withMATLAB

1. Fundamentals of MATLAB

2. Different Windows of MATLAB

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Fundamental components of

MATLAB

MATLAB standsMATrix LABoratory

MATLAB = a calculator + a lot more

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Different Windows of MATLAB

Opening MATLAB in a lab: most computer on campus

will have a direct shortcut on the desktop

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Double Click to

bring up the

MATLAB

Interface

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Starting Matlab

When you start MATLAB, 4 windows appear (by

default):

MATLAB Command Window

Current Directory Window

Workspace Window

Command History Window

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i) MATLAB Command Window:

To communicate with MATLAB program, use MATLAB

command window.

MATLAB display the prompt (>> ) to indicate that it is

ready to receive instructions.

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ii) Current Directory

Window:

It is much like a file manager window.

Used to access files.

For example: file.mit will open file in Matlab editor.

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iii) Workspace Window:

Display the variables created in the command window.

Workspace refers to the names and values of any

variable in-use in the current work session.

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iv) Command History

Window:

All the previous keystrokes entered in MatlabCommand Window showed here.

You can click and drag the command into theMatlab command window or Matlab editor.

You can alter the appearance of the desktop byclicking ViewDesktop layout.

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Frame #1The Command Window

Frame #2CurrentDirectory

Frame #3

Workspace

Frame #4Command History

Your Calculator Screen

You can do exactly as on your

calculator: add, subtract, divide,

multiple, use parentheses to

override the order of operations

Later on, you will realize you can do

a LOT more in this frame.

This frame

shows the

files (excel,

text,MATLAB

files) that

can

immediately

be used.

It will show the

variables that have

been created.

It will show all the

commands

executed

previously.

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MATLAB Desktop

Command

Window

Current

Directory

History

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MATLAB Desktopcontd

Command

Window

Workspace

CommandHistory

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General Setup

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A new window: the Editor

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"DOCK IT"

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Final common setup!

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How it will work

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1. Type your statements here

2. Run your statements

(or hit F5)

3. See your results here

(Modify your statements, repeat cycle)

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1. Basic Data Manipulation

Starting MATLAB on every machine usually leads to the prompt

symbols>> in the command window

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Entering Commands and

Expressions:

Try out this 3-line command in Matlab Command Window:

>> x=[0:002:8];

>> y=5*sin(x);

>> plot(x,y):

When you put semicolon (;) at the end of your command line, Matlabwill not shows the answer of your commands/expressions.

Example of mathematical expressions in Matlab prompt:

>> 8/10 ans = 0.8000

>> 5*ans

ans = 4

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Variables

A variable in MATLAB is a symbol used to contain avalue.

When we do not specify a variable name for a result,

Matlab uses the symbol ans as a temporary variablecontaining the most recent answer.

Scalar variable:

>> r=8/10

r = 0.8000 >> s=5*r

s = 4

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Variables

Scalar arithmetic operations:

Symbol

Operation MATLAB form

^ Exponentiation: ab a^b

* Multiplication: ab a*b

/ Right division: a/b a/b

\ Left division: b/a a\b

+ Addition: a+b a+b

- Subtraction: a-b a-b


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Vectors / Array

>> a=[1 2 3 4]

a =

1 2 3 4

>> a'

ans =

12

3

4

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Autofilling and addressing

Vectors

> a=[1:0.2:3]'

a =

1.0000

1.2000

1.4000

1.6000

1.8000

2.0000

2.2000

2.4000

2.6000

2.8000

3.0000

>> a(2:3)

ans =

1.2000

1.4000

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Matrices Creation in MATLAB

>> b=[1 2 3 4;5 6 7 8]

b =

1 2 3 4

5 6 7 8

>> b'

ans =

1 52 6

3 7

4 8

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Matrices

>> b=2.2*ones(4,4)

b =

2.2000 2.2000 2.2000 2.2000

2.2000 2.2000 2.2000 2.2000

2.2000 2.2000 2.2000 2.2000

2.2000 2.2000 2.2000 2.2000

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Reshape

>> a=[1:9]

a =

1 2 3 4 5 6 7 8 9

>> bsquare=reshape(a,3,3)

bsquare =

1 4 7

2 5 83 6 9

>>

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For

for i = 1:10

end

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xy Plots

>> x=[1 3 6 8 10];

>> y=[0 2 1 3 1];

>> plot(x,y)

00 getting started with matlab

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