matlab-basic-functions-reference.pdf
Create diagonal matrix from vector x=diag(A). Get diagonal elements of matrix Anonymous Functions. % defined via function handles fun = @(x) cos(x.^2)./abs ...
Anonymous functions and Intro to Matrices
put all of your code inside a Matlab function file which can sometimes be annoying if you're trying Accessing elements of a matrix is similar to a vector
Anonymous functions and Intro to Matrices
put all of your code inside a Matlab function file which can sometimes be annoying if you're trying Accessing elements of a matrix is similar to a vector
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MATLAB workers so that each worker contains only a part of the array. Yet ... function 11-239 troubleshooting programs 6-52. W wait function 11-241.
MATH 3670 - Intro to Scientific Computation - Fall 2017 Lab 6
Note the syntax of an anonymous function. It specifies the name of the argument of most MATLAB functions can be vectors and the usual result is applying the.
Lecture 1 Vectors Functions
http://www.ohiouniversityfaculty.com/youngt/IntNumMeth/lecture1.pdf
Bucknell University Using ODE45 MATLAB Help
generated by an inline or anonymous function. tspan. 2-element vector defining the range of integration ([to tf]) or can be a vector of
Introduction to Matlab
Note that most of these function will work on one number or if applied to a vector or Matlab help page on anonymous functions for an example). 2.7 Further ...
A MATLAB Tutorial
12 авг. 2016 г. The MATLAB function diff calculates the difference between successive elements of a vector ... anonymous function or a MATLAB function or a user ...
Ordinary Differential Equations
17 сент. 2013 г. A more compact version uses matrix multiplication in an anonymous function ... Matlab function ellipke and also use numerical quadrature with ...
Ordinary Differential Equations
17 sept. 2013 The Matlab function defining the differential equation has t and y as input arguments and should return f(t y) as a column vector.
Anonymous functions and Intro to Matrices
put all of your code inside a Matlab function file which can sometimes be annoying Matrix columns are separated by commas or spaces
matlab-basic-functions-reference.pdf
Definition of a character vector. "This is a string". Definition of a string str1 + str2. Append strings. Defining and Changing Array Variables.
Lecture 1 Vectors Functions
http://www.ohiouniversityfaculty.com/youngt/IntNumMeth/lecture1.pdf
Chapter 7 - User-Defined Functions and Function Files
dimensions of the arguments since the arguments can be scalars
Second 340 Matlab assignment Vector operations with Matlab You
Besides these vector functions Matlab has many functions which work on scalar or anonymous function which can be evaluated using fewer keystrokes and ...
MATLAB Programming
MATLAB Simulink
A MATLAB Tutorial
29 janv. 2015 3 Anonymous Functions Strings
Part I Matlab and Solving Equations
Vectors Functions
Introduction to MATLAB - Numerical Mathematics (TMA4215)
21 août 2014 A vector in MATLAB is a 1-dimensional numerical array. Arbitrary vectors can be ... The anonymous function can be assigned to a variable and.
IntroductiontoMATLAB
NumericalMathematics(TMA4215)
EirikHoelHøiseth
21August, 2014
www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 2WhatisMA TLAB?
- Highle velprogramminglanguage. - Simpletouse ,but significantlyslowerthan lowerlevel languageslike C++andJava. - Initiallya toolfor matrixcomputations (MATrixLABorator y), thatev olvedintoaplatformforscientificcomputing. - Hugescientificlibr ary. - Expensivelicense. www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 3Numbers
MATLABsupportsall theusualnumbers:
- Integers - Realnumbers - Complexnumbers Canmixintegers ,complex numbers,andreal numbersaswelik e.Example:
>>3.47*4-(5+4i) ans=8.8800-4.0000i
Note:Bothiandjcanbeused forthe imaginaryunit.
www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 4Storageofnumbers
- Bydefault anintegeristreatedandstored asareal number. - Realnumbers are,bydef ault,storedwithdoubleprecision (roughly16digits accuracy). - Acomplex numberisstoredas2 realnumbers(realand imaginarypart). www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 5Variables
Definition:V ariable
Avariableisareferencetoanobject. Theassignmentoper ator,=, isused toassigna valueto avar iable. Note:Variablesneednotbedeclaredbeforethe yareused.Example:Assignment
>>x= 2; >>y= x%xandyrefertodifferentobjects y= 2 www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 6Arrays
Definition:Arr ays
Anarrayisadatastructure .Itconsists ofacollection ofelements. Inanarr ayof dimensionnthepositionof anelement inmemory is givenbyan orderedsetofnindices.Note:InMATLAB allvariablesref ertoarr ays.
www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 7Definition:Scalars
Definition:Scalar
AscalarinMATLAB isa0-dimensionalarr ayholdingasingle value.Example:Creatingn umerical scalars
>>x= 3.4; >>y= 5+4i; www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 8Vectors
Definition:V ector
AvectorinMATLAB isa1-dimensionaln umericalarray.
Arbitraryvectorscanbecreatedusing thesquarebrac ket[]Wedistinguishbetweentw otypes:
- Rowvector:Elementssepar atedby acommaorspace - Columnvector :Elementssepar atedby asemicolon. Note:Acolumnv ectorisoften madebytransposingarow vector.Example:Creatingv ectors
>>x= [3 ,4, -1];%Rowvectoroflength3 >>y= [3+i;2-2i];%Columnvectoroflength2; www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 9GeneratingEqually spacedvectors
Thecolonoperator ,:,isuseful forcreating equallyspacedreal vectors: - a:bforb!acreates[a,a+1,...,a+m],wherem="b#a$. - a:d:bforrealdcreates[a,a+d,...,a+md],where m="(b#a)/d$,assuming(b#a)/d!0. Analternativ eisthebuiltinMATLAB functionlinspace: - linspace(a,b,n)createsaro wvector ofnequallyspaced pointsbetween aandb. www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 10Matrices
Definition:Matrix
AmatrixinMATLAB isa2-dimensionaln umericalarray.
Matricescanbecreatedsimilar lytov ectorsusingsquare brack ets: - Elementsina roware separatedb yacommaorspace - Rowsareseparatedb yasemicolon. Note:Vectorsandnumeric scalarscanbe thoughtofasmatrices.Example:Creating matrices
>>A= [3 21; 47-1];%Matrixhas2rowsand3columns www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 11Generatingcommonmatrices
BuiltinMA TLABfunctionsused togeneratesomefrequentlyused matrices: - zeros(n,m)generatesann%mmatrixofzeros. - ones(n,m)generatesann%mmatrixofones. - eye(n)generatesann%nidentitymatrix. - rand(n,m)generatesann%mrandommatrix. Note:Onlyneedto statethelength ofonedimension ifthematr ix issquare, e.g.zeros(n). www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 12Basicmatrixoperations
Themostcommon operationsare:
- +and#additionandsubtraction. matrixmultiplication. - ˆmatrixpowerforsquarematrices. - /and\matrixrightandleftdivision x.Similarly b/Asolvesthelinearsystem xA=bforx. •Preferabletomultiplyingbytheinv erse,e .g.(Aˆ(-1))*band b*(Aˆ(-1))respectively. - Puttingaperiodbeforetheoperatorgiv esthecorresponding elementwiseoperations:. ,.ˆ,./and.\. www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 13Usefulvectoroperations
Foravectorv
- sum(v)andprod(v)computesthesumandproduct respectivelyoftheelementsin v. - length(v)givesthelengthofv. - max(v)andmin(v)findsthemaximumandminimumofthe elementsinv. - normcomputesnorms ,e.g.norm(v)forthevector2-nor m. - diff(v)computesav ectorofdiff erencesofneighbouring elementsinv. - sort(v)sortstheelementsin vinascendingorder .Note:Mostofthese arealsoapplicab letomatr ices.
www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 14Usefulmatrixoperations
ForamatrixA
- A'andA.'givetheconjugatetranspose andtranspose respectivelyofA. - diagcanbeused togenerate diagonalmatrices andextr act diagonalsfrommatr ices. - size(A)givesthesizeof A. - eig(A)computestheeigenvaluesandeigenvectorsofA - cond(A)computestheconditionnumber ofA Note:Manyothersexist,and thelistedones oftenhaveadditional optionalf eatures. www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 15Indexing
Definition:Inde xing
Indexingintoanarr ayis ameansofselectingasubset ofthe elements. MATLABusesone-basedindexing, whichmeans theindicesstar t at1. Note:Indexingisanimportant programming toolinMA TLAB. www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 16Indexing:Vectors
- Togetthen-thelementinav ectorb,write b(n) - Letabeav ectorcontainingv alidindicesofthevector b.Then b(a)andahavethesamelength,andelementiofthev ector b(a)iselementa(i)ofb.Specialcases: •b(1:n)givesthenfirstelementsofb. •b(m:n)withm&nisthesub vectorfrom b(m)andupto b(n).Example:Indexing vectors
>>x= [1 020 30];%Vectortobeindexed >>x( [3,1])%Newvector ans= 3010www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 17
Indexing:Matrices
Definition:Subscr iptindexing
Withsubscriptindexingformatrices,w egiveanindex(orv ectorof indices)for eachofthetwodimensions ,separated bycomma, insideparentheses. Thefirstindexrefersto therows,andthe secondtothecolumns.Note:Thisisthe commonwa yofinde xingmatrices .
Somespesificcases:
- Theelementin them-thro wandn-thcolumn ofamatr ixAis indexedasA(m,n). - :isshorthand for1:end,andcan beused todenoteall rows orcolumns. E.g.A(1:n,:)extractsthefirstnrowsofA. www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 18Indexing:Matrices
Definition:Linear indexing
Withlinearindexing weindexasif thematrixwasa vector. The matrixbeingindex edistreated asifitselementsarestrungoutin a longcolumnvector . Note:Theresultingsub vectorhas thesameformastheindex vector. www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 19Example:Indexing
>>A= [13 5;7 911] A= 1357911
>>A( 2,2:3)%Subscriptindexing ans= 911
>>A( 3:5)%Linearindexing ans= 395
www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 20
Charactersandstrings
Definition:Char acter
Acharacterisaninter pretednonnegative integer.
Acharacter iswrittenbyenclosing itin"single" quotationmarks, e.g.'a'.Definition:Str ing
Astringisav ectorofchar acters.
Astring iswritteninthesame way asasinglecharacter, e.g. 'Thisis astring',andcan beindex edjustlik eanor malvector. www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 21Logicals
Definition:Logical
Alogicalisa datatypewhich canonlyha vethe valuetrueor false. - true(logical1)and false(logical0)e valuateto 1and0 respectivelywhenusedincomputations . - Anyrealnonzeron umberbecomes truewhile0becomes false,whencon verted toorusedasalogical.Logicaloperators:
- &(and)and|(or)combinelogical values. - '(not)gives thelogicalnegationofthelogical valuethat follows.Note:Alsowor kelementwisewithmatrices.
www.ntnu.noEirikHoelHøiseth, IntroductiontoMA TLAB 22Logicalexpression
Logicalsfrequentlyar iseasthe resultofalogicalexpressionDefinition:Logicale xpression
Alogicalexpression isane xpressionthatcan onlyevaluatetotr uequotesdbs_dbs14.pdfusesText_20[PDF] anova for categorical data
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