matlab 实验一.docx
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matlab实验一
A=[715;256;315];
B=[111;222;333];
A（2,3）
ans=
6
>>A=[715;256;315];
B=[111;222;333];
A（:
2）
ans=
1
5
1
>>A=[715;256;315];
B=[111;222;333];
A（3,:
）
ans=
315
>>A=[715;256;315];
B=[111;222;333];
A（:
1:
2:
3）
ans=
75
26
35
>>A=[715;256;315];
B=[111;222;333];
A（:
3）.*B（:
2）
ans=
5
12
15
>>A=[715;256;315];
B=[111;222;333];
A（:
3）*B（2,:
）
ans=
101010
121212
101010
>>A=[715;256;315];
B=[111;222;333];
A*B
ans=
242424
303030
202020
>>A=[715;256;315];
B=[111;222;333];
A.*B
ans=
715
41012
9315
>>A=[715;256;315];
B=[111;222;333];
A^2
ans=
661766
423370
381346
>>A=[715;256;315];
B=[111;222;333];
A.^2
ans=
49125
42536
9125
>>A=[715;256;315];
B=[111;222;333];
B/A
ans=
0.18420.2105-0.2368
0.36840.4211-0.4737
0.55260.6316-0.7105
>>A=[715;256;315];
B=[111;222;333];
B./A
ans=
0.14291.00000.2000
1.00000.40000.3333
1.00003.00000.6000
x=logspace（0,5,6）
x=
Columns1through5
110100100010000
Column6
100000
>>x=linspace（0,10,11）
x=
012345678910
>>x=[0:
1:
10]
x=
012345678910
>>a=[12;34];
b=[22;22];
c=a*b
c=
66
1414
>>a=[12;34];
b=[22;22];
c=a.*b
c=
24
68
>>a=[12;34];
b=[22;22];
c=a/b
Warning:
Matrixisclosetosingularorbadlyscaled.
Resultsmaybeinaccurate.RCOND=5.551115e-017.
c=
1.0e+015*
-2.25182.2518
-2.25182.2518
>>a=[12;34];
b=[22;22];
c=a./b
c=
0.50001.0000
1.50002.0000
>>x=[-4.85-2.3-0.21.34.566.75];
ceil（x）
ans=
-4-20257
>>x=[-4.85-2.3-0.21.34.566.75];
fix（x）
ans=
-4-20146
>>x=[-4.85-2.3-0.21.34.566.75];
floor（x）
ans=
-5-3-1146
>>x=[-4.85-2.3-0.21.34.566.75];
round（x）
ans=
-5-20157
>>a=[5:
1:
15];
b=[12887101211131415];
y=a==b
y=
y=
Columns1through10
0001010011
Column11
1
X=[01;10];
Y=[00;10];
X&Y
ans=
00
10
>>X=[01;10];
Y=[00;10];
X|Y
ans=
01
10
>>X=[01;10];
Y=[00;10];
~X
ans=
10
01
>>x=[01;10];
y=[00;10];
x&y+x>y
ans
ans=
01
10
ans=
01
10
>>a=magic（3）;b=243;
savemyvarab;
clear;
loadmyvar;
who
a,b
Yourvariablesare:
ab
a=
816
357
492
b=
243
w=sqrt
（2）*（1+0.34245*10^（-6））
w=
1.4142
>>a=3.5;
b=5;
c=-9.8;
x=（2*pi*a+（b+c）/（pi+a*b*c）-exp
（2））/（tan（b+c）+a）
x=
0.9829
x=1:
0.1:
10;
plot（sin（x））
>>helpplot
PLOTLinearplot.
PLOT（X,Y）plotsvectorYversusvectorX.IfXorYisamatrix,
thenthevectorisplottedversustherowsorcolumnsofthematrix,
whicheverlineup.IfXisascalarandYisavector,length（Y）
disconnectedpointsareplotted.
PLOT（Y）plotsthecolumnsofYversustheirindex.
IfYiscomplex,PLOT（Y）isequivalenttoPLOT（real（Y）,imag（Y））.
InallotherusesofPLOT,theimaginarypartisignored.
Variouslinetypes,plotsymbolsandcolorsmaybeobtainedwith
PLOT（X,Y,S）whereSisacharacterstringmadefromoneelement
fromanyorallthefollowing3columns:
bblue.point-solid
ggreenocircle:
dotted
rredxx-mark-.dashdot
ccyan+plus--dashed
mmagenta*star（none）noline
yyellowssquare
kblackddiamond
vtriangle（down）
^triangle（up）
>triangle（right）
ppentagram
hhexagram
Forexample,PLOT（X,Y,'c+:
'）plotsacyandottedlinewithaplus
ateachdatapoint;PLOT（X,Y,'bd'）plotsbluediamondateachdata
pointbutdoesnotdrawanyline.
PLOT（X1,Y1,S1,X2,Y2,S2,X3,Y3,S3,...）combinestheplotsdefinedby
the（X,Y,S）triples,wheretheX'sandY'sarevectorsormatrices
andtheS'sarestrings.
Forexample,PLOT（X,Y,'y-',X,Y,'go'）plotsthedatatwice,witha
solidyellowlineinterpolatinggreencirclesatthedatapoints.
ThePLOTcommand,ifnocolorisspecified,makesautomaticuseof
thecolorsspecifiedbytheaxesColorOrderproperty.Thedefault
ColorOrderislistedinthetableaboveforcolorsystemswherethe
defaultisblueforoneline,andformultiplelines,tocycle
throughthefirstsixcolorsinthetable.Formonochromesystems,
PLOTcyclesovertheaxesLineStyleOrderproperty.
Ifyoudonotspecifyamarkertype,PLOTusesnomarker.
Ifyoudonotspecifyalinestyle,PLOTusesasolidline.
PLOT（AX,...）plotsintotheaxeswithhandleAX.
PLOTreturnsacolumnvectorofhandlestolineseriesobjects,one
handleperplottedline.
TheX,Ypairs,orX,Y,Striples,canbefollowedby
parameter/valuepairstospecifyadditionalproperties
ofthelines.Forexample,PLOT（X,Y,'LineWidth',2,'Color',[.600]）
willcreateaplotwithadarkredlinewidthof2points.
Backwardscompatibility
PLOT（'v6',...）createslineobjectsinsteadoflineseries
objectsforcompatibilitywithMATLAB6.5andearlier.
Seealsoplottools,semilogx,semilogy,loglog,plotyy,plot3,grid,
title,xlabel,ylabel,axis,axes,hold,legend,subplot,scatter.
Overloadedfunctionsormethods（oneswiththesamenameinotherdirectories）
helptimeseries/plot.m
helpphytree/plot.m
helpchannel/plot.m
helpcfit/plot.m
helpfints/plot.m
helpidmodel/plot.m
helpidfrd/plot.m
helpiddata/plot.m
helpcgrules/plot.m
helpxregtwostage/plot.m
helpxregtransient/plot.m
helpxregmodel/plot.m
helpxregarx/plot.m
helplocalmulti/plot.m
helplocalmod/plot.m
helplocalavfit/plot.m
helpsweepset/plot.m
helpmdevtestplan/plot.m
helpcgdatasetnode/plot.m
helpmpc/plot.m
helprfckt/plot.m
helpfrd/plot.m
helpdspdata/plot.m
helpwdectree/plot.m
helpntree/plot.m
helpdtree/plot.m
helpwvtree/plot.m
helprwvtree/plot.m
helpedwttree/plot.m
ReferencepageinHelpbrowser
docplot
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