Introduction to Matlab Tutorial 1

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Yuval Hart, Weizmann 2010 1

Introduction to Matlab

& Data Analysis

Tutorial time:

3 * one hour sessions:

Wed 11:00-14:00

Office hours:

Tue 09:00-10:00

Course website:http://www.weizmann.ac.il/midrasha/courses/MatlabIntro

[email protected]

Tutorial 1:

Introduction to Matlab Environment
http://www.weizmann.ac.il/midrasha/courses/MatlabIntrohttp://www.weizmann.ac.il/midrasha/courses/MatlabIntro


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Tutorial Modes

Hands off (Most of the tutorial)

Presentation

Repeating lecture material

New material

Hands on

Examples

Home work submit here

Usually two weeks after submission

Checkout the course website for updates and FAQs


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Before we start

Problems

If you have computer problems while using theroom, please contact:

Irit Orr (#2470) or the WICC PC Helpdesk(#3440).

If you see issues that can be taken care of after

your session is over, please contact Irit Orr(#2470) or Ariela Mendel (#3938).


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Before we start Rules of use

Please help us keep the room in goodworking order. Do not allow food or drink to be brought into

the room

Report problems promptlyWhen leaving the room at the end of a session: Leave the computers on Turn off the projector Turn off all the heating / air conditioning units.

This can be tricky; cup your hand around the

end of the remote control to help focus thebeam on one unit at a time. Put the doorstop on the ledge under the

whiteboard at the front of the room Put garbage into the receptacle Turn off all the lights, including the spotlights

that are controlled by the dimmer switch Close the door and make sure that it locks


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Become a Friend of Matlab

Why? It has very attractive visualizations

It wants to be your friend: Very easy to learn

Great HELP(!) menu and tutorial

Check out the resources in our website.

Very useful: From a simple calculator to complex data

analysis toolbox.

Many implemented algorithms.

Great tool forscientific work.


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Installing Matlab

Classroom

Computing supervisor

Novel:

Enter to disk Z (username / password)

Boris 2443

See instructions on the course web page


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Goals of This Tutorial

1. Familiarizing ourselves with the Matlab Environment

2. Learning basic operations (such as changing directory)

3. Learning to use Matlab as a simple calculator

4. Writing our first script

5. Learning to use the Help!!!


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Computer Structure - Software

Hardware

Gives services to

software:

Access input/outputdevices

Memory allocations

And much more

Software

Operating system


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From Thoughts to Program

Humanlanguage

Matlablanguage

Intermediatelanguage

Computerlanguage

compiler

I want to addone and one

1+1 mambo-jumbo 010011010011

OperatingSystem


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Matlab - Background

Matlab (Matrix Laboratory)

An interactive program that is suitable for

running computations, drawing graphs andmuch more (graphical interface).

A programming language for technicalcomputing (scripts).

Lets start


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Command Window

Command line

Matlab as a calculator:

Lets run our first command:1 + 1


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Command Window

Previous Command line

The output is displayed Get the previous command by pressing up

arrow keyboard

Can clear window using the command clc

Output (answer)

Current Command line


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Workspace Window

Workspace Window

All workspace variables

Variable value

Demo:

matlab(demo)

http://www.mathworks.com/support/2009b/matlab/7.9/demos/WorkingInTheDevelopmentEnvironment.html


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Command History Window

Command History Window

History

Try drag the command tothe command window


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Matlab Arithmetic Operators

Plus +

Unary plus +

Minus -

Unary minus -

multiply *

power ^Backslash or left matrix divide \

Slash or right matrix divide /


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Matlab Special Numbers

pi 3.14159265

i and j Imaginary unit

eps Relative precision 2-52

realmin Smallest number 2-1022

realmax Largest number (2-eps)* 21023

Inf Infinity (divide by zero or larger then realmax)

NaN Not a Number (0/0 Inf/Inf)

1


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Lets Try Matlab as a Calculator

I want to make a fruit salad for10people.

Ingredients for 5 people:

6 oranges5 bananas

3 apples

1 melon

Price list:

orange 1.5

banana 1.2

apple 1

melon 5

What is the total num of fruitsneeded?

How much will it cost to makethe salad?

Answer:


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Lets Try Matlab as a Calculator II2*5+10

2*(5+10) What does it tell you?

2/3*4

1/0 What did you get?

0/0

1+2+3+4+5+6 Try to use in order to write in more than one line

2*realmax What did you get?

Try to use:

clc, up/down arrow

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Usually a Matlab command ends with ; to disable echo to the command line.

There are 3 ways to display the output: disp() , no ; fprintf()

Evaluation

Operator evaluation priorities are mathematical

(-1+3+2*pi)^(3/4)

Overflow

Inf NaN


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Using the Help

Help:

Help (help cos);

lookfor

Doc (doc cos);

Search

F1 / right click

Google matlab

Getting started

Matlab contains manymathematical functions.

Matlab is case sensitive!

1. Search forelementarymath functions referenceand find the mathematical

function reference list2. How do I calculate square

root ? Search...

3. What does the function

factor do?4. What are the differences

between ceil floor, fixand round? Try to run

Fix what happened?


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Output Format

Use the format function to control theoutput formatof numeric values

displayed in the Command Window. formatshort (5 digits) , formatLong (15 digits) , formatrat

Pi = 3.1416, 3.141592653589793 , 355/113

formatCompact / formatloose

determines the line spacing in theoutput

Checkout the doc of format


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Current Directory Window

Current Directory

Double click on a file will open it:

.m file (script) in Editor/Debugger

.fig file (figure) in Graphic window

.mat file (data) will load variables tothe workspace

Current Directory Window

Files


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Changing The Current Directory

1

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pwdcurrent path

cdchange directory

./- current directory

../- parent directoryLets change our directory to ourworking directory.

We will need to do so on everytutorial start


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Editor / Debugger WindowOpen the Editor: Desktop menu -> Editor

F5 / run button

disp(hello world);

You can dock thewindow


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Set Matlab Search Path

Matlab search for scripts and functions in:

Current directory.

Path directories.

Can be done also using addpath, rmpath , path etc.

Matlab search order:

variables -> keywords -> current directory -> search path.


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Editor / Debugger Windowopen Editor: Desktop menu -> Editor

Save your script as helloWorld

run in the command window: helloWorld

More:

Cntrl-C (editor / command win.), Cntrl-V, Cntl-Z,Cntl-F, Cntrl-H

Comments % , %{ this is a comment %}

Case sensitive (and syntax errors)

disp(hello world);


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Handling Errors Errors - Examples: dis(error) , disp(error):

Syntax error in a command

Syntax error / Runtime error in a script


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Desktop Layout Layoutthe arrangement of the

windows on the desktop

Any window on the upper right corner


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Standard Toolbar

Help

Window

Desktop

Edit

File

More on desktop :

http://www.mathworks.com/support/2007a/matlab/7.4/demos/desktop.html
http://www.mathworks.com/support/2007a/matlab/7.4/demos/desktop.htmlhttp://www.mathworks.com/support/2007a/matlab/7.4/demos/desktop.html


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Submitting Exercisesdocumentationand proper coding

% HW_1 solution % Yuval Hart 03922881

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% short description:% this program calculates and displays the Matlab students grades.

% calculation is based on grades in the final exam and a number between% 0.0-2.0 which present the participation of each student in the class.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

grades = [80 77 70 60 65]; % vector holding the students gradesparticipation_in_class = [1.10, 1.05, 1.07, 0.99, 1.10]; % vector holdingthe students%participationfinal_grades = (grades .* participation_in_class) + 10; % calculate the students final grades

disp(final_grades);

- if (final_grades

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