ME 2115 1/27/17

Types/classes (Section 1.3.1)

Real #s

Single

Double

Can store larger

Integers

int 8

int 32

int 64

Characters or strings

Char. enclosed in single quotes

EX: A = "my name"

Char. means characters

A . My name

Whos

Shows type of variable

Format 1.4.1

click to edit

Short

Long

Loose

Compact

To specify how expressions will be displayed in the command window.*

Operators [1.4.2]

(+ , - , * , / , \, ^)

E --> exponential notation

e^2 means 10^2

Operators precedence [1.4.2.1]

PEMDAS

MATLab will run In this order, ( ), ^, * / \, + -

Practice 1.2

-5^2 = -25, unless you put a parenthesis around the 5

5 8 / (2) * 4 = 80

10 - 6/2 = 7

CH 2.1, 2.2, 2.3

arrays

Row vector, column vector

2D -> matrix

Set of values of the same type, arranged systematically in tabular form.

Row goes from horizontal

Columns are vertical

Vector

row vector --> 1 row, multiple columns

[1 2 - 5 6] . 1X 4 space or comma,, in between elements

Column vector -> multiple rows, 1 column

[ 2 ; 4; 6 ; 7; -8] 5 X 1( ; ==> end of row)

A(row, column)

A(1,3) would denote what is in the first row, third column.

A(end) would denote what is the last element of the list of variables

Colon operator

start : increment: end

EX. 0 : 2 : 11

a = [ 0 2 4 6 8 10]

0 : 3 : 10

a = [ 0 3 6 9]

Linspace

x = linspace ( 0, 10 , 5)

So we are going to start at 0, end at 10, and have 5 points