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Signals & Systems

Introduction to MATLABBo-Yuan Peng

E.E. Dept.,National Taiwan University

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Before the talk starts

Our course website:

http://cktlab.ee.ntu.edu.tw/ss2009spring

Remember to be concerned about anyof the changes on our course website.

http://cktlab.ee.ntu.edu.tw/ss2009springhttp://cktlab.ee.ntu.edu.tw/ss2009spring

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The Course Web Site

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Outline

What is MATLAB?

Where to use MATLAB?

How to use MATLAB? Homework 1

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What is MATLAB?

MATLAB is an interactive environment inwhich you can write programs to do manypowerful calculation.

Number calculation Matrix calculation

Plots and/or sketches of mathematical graphs

Symbolic calculation

Differential Equations

Blablabla

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Where to use MATLAB?

The MathWorks, Inc. sells MATLAB. If you are rich, then you may use it at home.

If you are poor?

Fortunately, this university is rich. You can use MATLAB at Computer Center.

MATLAB is installed in every computer in everycomputer classroom in CC Building.

MATLAB is installed in every computer in EEII107.

Also, you can connect to the Soft-Bank provided byComputer Center to access MATLAB remotely, givenyour IP is 140.112.x.x .

http://softbank.cc.ntu.edu.tw/

Only 6 licenses available. DONT OCCUPY the resource.

http://softbank.cc.ntu.edu.tw/http://softbank.cc.ntu.edu.tw/

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Soft-Bank in CC

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Soft-Bank in CC

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Soft-Bank in CC

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Soft-Bank in CC

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How to Access MATLAB at Home?

Soft-Bank can be accessed only ifyour IP is 140.112.x.x .

Solution: Virtual Private Network

https://sslvpn.ntu.edu.tw/

You can log-in with your studentaccount provided by CC.

https://sslvpn.ntu.edu.tw/https://sslvpn.ntu.edu.tw/

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Access MATLAB at Home

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Access MATLAB at Home

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Access MATLAB at Home

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How to use MATLAB?

If you are using MATLAB from Soft-Bank, just click it on.

If you are using MATLAB in thecomputer classroom in CC, selectStart -> Programs -> MATLAB ->MATLAB will turn on MATLAB.

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How to use MATLAB?

You will have to know the pathwhere MATLAB is installed. In CC, itis installed in C:\Program

Files\MATLAB . All of your programs in MATLAB should

be put into C:\Program

Files\MATLAB\work in order to use thefile.

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How to use MATLAB?

First test

Simple calculation +, -, *, /, ^, mod()

Operators

Use help Variables

No need to declare. Just use it.

DO NOT use variable i and j. They areimaginary numbers.

Matrices

Use of squared bracket [ ]

* vs. .*; / vs. ./

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How to use MATLAB?

The use of operator :

plot(), stem(), subplot()

Flow Control if elseif else end

switch case otherwise end

for, while, continue, break

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How to use MATLAB?

m-file: a batch of MATLAB command

You can edit an m-file and save it in thework folder

Use it as a command

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How to use MATLAB?

If you want to plot a lot of graphs

subplot()

figure()

pause

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How to use MATLAB?

Functions in MATLAB

Youd better to use one m-file with one

function.

syntax: function y = foo()

Some useful function

zeros()

ones()

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Homework 1

Download the .pdf file and the .zip filewith m-files inside.

Pick m-files from the .zip file. Follow the instructions inside the .pdf file

to construct one proper m-file. Do discussion with the results in a .pdf file.

You may do discussion in Word 2007 then saveit as a .pdf file.

Compress the discussion and the m-fileinto one .zip/.rar file. Upload the compressed file to the website.