[SOLVED] matlab Matlab: An Introduction

Matlab: An Introduction

Introduction to MATLAB

Mike (Y-Q.)
[email protected]

Sept 2014

mailto:[email protected]

outline

whats matlab?
interface
basics
an example
how to access
help

what is it?

MATrix LABoratory, by MathWorks
high-level programming language
so, its very simple to code
rich in libraries and graphical subroutines
transportable across platforms
a great tool for rapid prototyping
not the best for real-time applications

interface

command window
workspace
current directory
command history
array editor
text editor

basics

Hello World!
a = 3;
b = 4;
c = a + b

end each statement with semicolon, if you do
not like to see the result in the command
window

basics
arithmetic operators:

addition: A+B
subtraction: A-B
multiplication: A*B
right division: A/B = A*inv(B)
left division: AB = inv(A)*B
power: A^b
transpose: A
colon operator:

to create vectors: a:b
array subscripting: A(:,b)

basics

dot operators (a.k.a element-wise operators)
A.*B, A./B, A.B, and A.^B

relational operators
a b, a>=b, a==b, and a~=b

logical operations
a||b (or),a&&b (and), ~ a(not)

element-wise logical operators
A|B, A&B, ~A

basics

operator precedence
Parentheses
transpose and power
unary plus, unary minus, and logical negation
multiplication(s) and division(s)
addition and subtract

basics

flow control
conditional control

if, else, and elseif
switch and case

loop control
for
while
break
continue

basics

if
if expression1

statements1

elseif expression2
statements2

else
statements3

end

basics

for
for index = values

program statements

end

while
while expression

program statements

end

basics

function definition
function [output_variables] =
fcn_name(input_variables)

the name of a function should be consistent with
the file name

an example

Given the corresponding coefficients of two lines
(ax+by+c=0), calculate the intersection point and
plot the lines on a figure.

Function:
[intersection,Runtime] = myPlot(line1,line2)

Script to call this function:
clear all;clc
load coeffs
line1 = coeff(1,:);
line2 = coeff(2,:);
[intersection,RunTime] = myPlot(line1,line2)

how to access?

have a license
Nexus computers

on campus
remotely

Octave

help

where to look for answers?
Matlab Help
Mathworks website
Online forums
TAs

refs

www.mathworks.com
www.gnu.org/software/octave/
saw.uwaterloo.ca/matlab/