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Matlab Onramp notes
MATLAB and Simulink for Research in Industry (Coventry University)
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Matlab
Matlab
First 30
course
wk 1
Simulink
a
Intro IIpt
mins useless
Commands
just talking about how he designed
and designprocess
Simulink is apart Matlab Matlab is software
of
oriented
standard
a library
consisting
functions
of
package
of
Matlab allows you to code through the
library with
quick setsofinputs
Simuline is a graphically based software Consists
of a
library blocks used to calculate mathsmodule or
of
produce
Have
response in the form
a
a
look at reaomended
Week 2
Matlab
of a graph
1 2
Programming in Matlab
books
20
Part
Introductions
Input Commands
COMMANDS
Clear
r
clears workspace
Save
Save workspace tofile
filename
Load filename
loads variablesfromsavedfire
entername variable Displayscontents Variables
of
of
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q
of
pays
Ackers Bonnard window
IT
pi
sqrt
formatlong to display more decimalpointraves
switchbackto defaultdisplay
format shot
CLC
3 I
when
B
the standard set up bag
the Command window workspace
start Matlab
you
workspaces
current holder
All
their
Gommands
outputs together canbeorganised
by brewing alive script in MATLAB editor
by
Enter the commands
clinching
new
live script
intothe
grey
codebox
clicktextmode to annotate commands
This lets you run
button
that
multiple commands
evaluates
atonceby
all commands inorder
clicking the run
broken into sections Gectionbreakbutton
letting you run justthat section
Maximise the MittaB editor or select layout button to use fivescript
The script can be
with command
window
4.1
All
maths variables are arrays Coach numeric variables contain
murine
I
Eiti
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Arrays can be created with Squee brackets iegfx BS o.sc 3
separating the numbers with aspace or comma it creates a rowrector
Column vectors are created
with
semi lolonsfnbyD.egfx fi.SI ax
s
3
8 0
will shorten the input numbers Eg if 5 8 ay 5678
Using f
Thespacing is automatically setto onebutcanbealtered Eg yes 20.8
GETS
to 7189 b
axe
I 3 13 JE 3.4 12.13 2 3 213 Boxe 3,47411113
If the ofelements wanted in avectoris known use the finspace function
binspacerfirst
led 00400.2so asoo
Jelements 2Gtinspace
last r
also
to
Arowvector canbe transposed into a column vector using an apostate f l
a
Cg
I 3 axel 23
simplified
x rand
x
de rond fy iz
Or you can use
Il
2
1
to see
x Es
3
creates a randomarrayof 2 by 2
l
instafund
yby 2
E ones
see
if i
5.1
Every variable in MATIAS is an array
Indexing referringto elementsin an array This is howyouextract
Modify arrays The position of a valve in thearray is calledits index
The index canbe used to extractparticular values
8 9 10
I 2 3 y S Z 7
Dt x 213161 910 Is I 3 I 7 l Il 8
x
Teffersetothe 3rd position which can easily be chargedby
di 37 It or
you can extract
x 2 47 A B l 9
orangeof valves with a colon
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Seg SC Nr D
requires youto specify2positions
you wantto extaract Anwhole row or column use a colon as an
index This
way the colon stands for all KCI meansfirstrow
son's
3 To
or
andall columns
A matrix
rowholumn
If
34 18
xe.io
REMEMBER MATRIX INDEXING Is
and vectors only need 1 index
end is
It
can
acrow CoD
Matlab keyword used to reference the lastdemerit
be used as an index This can also be usedwith
a
arithmic tofind the
second last
fend fend 2
y
A single index valvecanbe
demerit
of
5th lasted
used to reference vectorelements
the3rdelementof vector v wher vis eitherardorld
Asinglerangeofindexvaluescanbeusedtoreference asubsetofrectordennisreg servo add
the
returns asunset redorrContaining elements
from 3to end
of
Cgi term
returns
b
You can addtogether any 2arrays ofthe same size
The Marinum raveof avatarcanbe determined using the malfunction
Max MaxGO
e
When multiplying matrix
do not use
to perform erementwise multiplication
elements
ofthis gravy
filth
sizedarrays
use
Thisallows
ya
thehorresponding
you multiply
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The
size
Variable containing
toanarray toproduce
canbe applied
function
the array size
Using squarebrackets
Escrow I cold Size
S
a singleoutpet
size 00
for morethanone output canbe obtained
The Maxvalue ofavectorandits
corresponding index valve can
bedetermined
usingthe Max function Thefirstoutfitfromthe matfund isthemax
value An input rector The second
wall isthe indet value
of
GcMax
ida
fit
MaxGO
8
you comeacross afunction you dontknow you can use
thematlab documentation by choking ke helpbutton andsearching
the function inthe browser
When
q
plotting
Twovectors
using the
ofthe samelength
pot
function
protocol The plot function
additional argument thatallows
you
stole using differentsymbolsin
dashedlines
8
o
can be plotted against eachother
to
singlequotes
colour linestyle manner
specify the
where r red
plotGc y r o
acirdeab a marker
To plot oneline ontopofanother
usethe hold on command
addandherline
while you
When
the holdon stateis on plotswill
previous command
acceptan
III
continueto
toholdke
the sameaxis
go on
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her he
Toreturn
l
i
i
g
s
todefault plotbehaviourwhere eachplotgetsitsownaxis wehold
n
np
n
off
When
threatorvalves the axisandautomat
yougot asinglenectarby itself Matiabuses
for y
assigns the x axis datatorange In
Theplotfunction
accepts optional
additionalinputs
consisting
ofaproperlytamedassociatedrive
width 5 wherelinewidth is thicknessand 5 is thickness value
plotCyfline
plotters ro i'linewidth
ANNOTATING PLOTS
labels canbeaddedtoplotsusingplotannotation functionssuchas title Theinputtocheese
functions is
a string
glabelflubdd
stringsareenclosedin doublequotes
legendTa
b
I titteffottitle
I
10
Electricity Usage project
In this project youwill got electricity usage for various economicsectors
Cresidentid commercial kindustrich
10.2 AUDIO FREQ Project
In this projectyouwill analyzethefrequency latentofan organplaying
the C chord CC 2.61 6th 329.6142 6 392.0HI
N
IMPORTING DATA
The current folder browser lets you
on
your computer
If
explore any files youhave
a
Matlab select
you wantto import file into
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e l
won mp
C p
w r
y
the
file click import data on doubleclickEDO
DC on a mat file will open itin nub DC a jpeg will open itas
f
y
f
arrayofpixel values DC on a txt or Csvrspreadsheetgives
alotof options on how to store theinfo on matlab so the importtool
opensand a preview thedata is shown The data that will be
of
a numeric
willbe highligted inblue any missind datain orange and
win by default be replacedwit Nan fNatalimarl
default
By
the importtool will import this as a table but otheroptions
are available under output type stable bivector NumericMatrix string
A table allows all the data to be imported
array all array
into 1variable in the workspace The import fool automatically chooses
an appropriate datatape foreachof thevariables inthe table butyou
the outputvariable
can change it ifneed be The default name
imported
comes
the
from
file
name
spreadsheet
to
Its
Common
contain headers
for
for thefirst
foryour columns
row
ofyour
tool
The import
that and uses them as thetablevariablesones When you
click the import selection button Matlab importsthedataand createsthe
sees
variable in the matlab
workspace
To
extract a variable fromthe table you can use
eg a data VariableName
dotrotation
you working with table you might wantto keep related data
If
theresult
together Instead
are
calculation to
doesn't
exist
a
ofcreating separatevariables you can assign
table dataHeightMetres data HeightYards
a
0.944
if
of a Metres
dataHeight
willcreate anewVariables inketablewiththe rare HeightMetres
MATLAB
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w are anew ar
Ir
ke ab
herane
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g
Youcan interactwith a tableby clicking on it intheoutputpaneofalinescript Forexample
tableusingone itsvariables Onceyouarehappywithyourtable canmakethe
youconsort a
of
you
changes permenantby updatingthecode in
yourscript
Dot rotation is used toextractfake variables Toextractrows youcanuse
NewTable
Name
regular array indexing
OldTableNamed 3
To extractthefirst3rows
rotatable
12 Logical INDEXING
Rational
operators suchas
74
and
performcomparisons
between2rones
foracomparison forequality orinequality iseither Iftrue or 0Jase
Theoutcome
Youcan compare avector ormatrixto asinglescalar rave
Theresultis
a logicalarray
ofthesamesize astheoriginal array
using rational operators
is
in
You can use dogia array ab a index inwhichcase Matlab extractsthe
rag
array elements where theindex is true Eg Toextend all theelementsinVI
than 6 V Not 60
it beb
greater
Youcanalso uselogicalindexing withtwodifferentvectors V Sampleon 67 V 13
ifyouwishto replaceall
Youcanuselogicalindexingtoreassignvaluesin anarray Forexample
array
fallowing Syntax ache 7997
areequalto 999with 1 usethe
odthat
Youcan thelogical operators and
use
Tofind values
Tofind values
Hl
and or
lessthan 4 andgreaterthan2 use
6
than
greater
or
2 use Ii
lessthan
x
valvesinthe
1 A VIGIL47
0
tocombine logical comparisons
x v1Gk4 v120
it fit 6 I AD
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J
13
I
g
Programing
scripts by default calculatefrombeginning toend
IIII
What
if
wantedtoseethe
softfoe if I waspositive Thecode
you only
it
is a is positive andbehave accordingly end Irresgaroo Now when x
is positive this conditionistrueandallthecode xsg xn2 Willberun
X is
can determine
tug
Ifstatement
thethecodeisfalse and it skips to theendstatement The
control theflowoftheprogramme Anoter is
the
is one
way to
flocks thatexecutejustoneseatingcodefrom2optionsormore
insted skipping withoutcopypasternodigy
of
you wantto repeat a setofcommands
common loop is
a farloopthat uses the
you canuse aloop Themost
If
If
If
for
keyword
followed bythe desired repeated codefollowedby read
thebroody
codeinthe loopwill be repeated multiple times
it's a simplecode a loop probably isn't needed and
you can use Matlab
natural array capability i
without a loop for cases more complicated
If
for100ps giveyou away torepeat a setoftasks acrosscorrectionsofdata
The bodyof an
if blockis only executed
thecondition is true
if
Use tocheckforequality items Is
The Kisei
keywordcanbeusedafter
includemultipleretseifblocks
x rand
if oeio.SI Condition
end
if
toddy
toaddmore conditions youcan
when this codeis on theloopbody willbeexecuted for
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three times
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run
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f
as the loopcounter p Progressesthroughthevoves
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0
end
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dtsPrc
T
fwpvwenttolooponeraveo.org unknown length you can
length function instead
14 I
for idoc
tilengthrvector.name
Stellar MOTION PROJECT
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body
use
the