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作业.docx

作业

本次活动是一个组的同学,把其中一个人眼睛蒙上,其余的人指挥他在教室里走一圈;共进行了四轮,第一轮是一个人,第二轮是两个人,依次增加,一直到最后有20余人参加.本次活动要求指挥者只能是坐在原位,不能跟随参与者走因此,多方的指示声让蒙眼者产生了混乱,从而一圈时间加长了。

人数的增加多也是时间变长的原因之一。

除此之外还有老师突然设置的障碍,更是加重了活动难度。

以上种种原因皆是影响时间长短的重要因素。

为此,我们可以采取以下措施来减少一些麻烦。

首先,我们可以规定最靠近行走者路线的组作为指挥员,最好是一组的两头和中间。

再是,活动中出现了一个失误,20余人分成了三队,女生和男生掉队了,而男生也没接上,总体速度迅速下降。

所以,整个队伍应注意步调协调,前者引导后者,配合后者,争取整队一起快速走一圈,这样的团队速度是最快的,时间是最短的。

a=[13pi3+5i]

a=

Columns1through2

1.00003.0000

Columns3through4

3.14163.0000+5.0000i

>>b=1:

10

b=

Columns1through7

1234567

Columns8through10

8910

>>a={135}

a=

[1][3][5]

>>a=(135)

?

?

?

a=(135)

|

Error:

UnexpectedMATLABexpression.

>>x=linspace(3,6.4)

x=

Columns1through4

3.00003.03433.06873.1030

Columns5through8

3.13743.17173.20613.2404

Columns9through12

3.27473.30913.34343.3778

Columns13through16

3.41213.44653.48083.5152

Columns17through20

3.54953.58383.61823.6525

Columns21through24

3.68693.72123.75563.7899

Columns25through28

3.82423.85863.89293.9273

Columns29through32

3.96163.99604.03034.0646

Columns33through36

4.09904.13334.16774.2020

Columns37through40

4.23644.27074.30514.3394

Columns41through44

4.37374.40814.44244.4768

Columns45through48

4.51114.54554.57984.6141

Columns49through52

4.64854.68284.71724.7515

Columns53through56

4.78594.82024.85454.8889

Columns57through60

4.92324.95764.99195.0263

Columns61through64

5.06065.09495.12935.1636

Columns65through68

5.19805.23235.26675.3010

Columns69through72

5.33545.36975.40405.4384

Columns73through76

5.47275.50715.54145.5758

Columns77through80

5.61015.64445.67885.7131

Columns81through84

5.74755.78185.81625.8505

Columns85through88

5.88485.91925.95355.9879

Columns89through92

6.02226.05666.09096.1253

Columns93through96

6.15966.19396.22836.2626

Columns97through100

6.29706.33136.36576.4000

>>x=linspace(3.6.3)

?

?

?

x=linspace(3.6.3)

|

Error:

UnexpectedMATLABexpression.

>>x=linspace(3,6,3)

x=

3.00004.50006.0000

>>a2=[1,2,3;4,5.6;7.8.9]

?

?

?

a2=[1,2,3;4,5.6;7.8.9]

|

Error:

UnexpectedMATLABexpression.

>>a2=[1,2,3;4,5.6;7,8,9]

?

?

?

Errorusing==>vertcat

CATargumentsdimensionsarenotconsistent.

>>a2=[1,2,3;4,5,6;7,8,9]

a2=

123

456

789

>>ones(6)

ans=

111111

111111

111111

111111

111111

111111

>>zeros(3)

ans=

000

000

000

>>b=reshape(a2,3,3)

b=

123

456

789

>>a=-4:

4

a=

Columns1through7

-4-3-2-1012

Columns8through9

34

>>b=reshape(a,3,3)

b=

-4-12

-303

-214

>>A=[172418;222714;461320];

>>A(:

:

2)=A-10

A(:

:

1)=

172418

222714

461320

A(:

:

2)=

714-9-2

-812-34

-6-4310

>>sub2ind(size(A),2,1,2)

ans=

14

>>A(14)

ans=

-8

b=zeros(3);

>>b(:

)=1:

9

b=

147

258

369

>>IND=[3456]

IND=

3456

>>I,J]=ind2sub(size(b),IND);

?

?

?

I,J]=ind2sub(size(b),IND);

|

Error:

Unbalancedorunexpectedparenthesis

orbracket.

>>[I,J]=ind2sub(size(b),IND);

>>I,J]=ind2sub(size(b),IND);

?

?

?

I,J]=ind2sub(size(b),IND);

|

Error:

Unbalancedorunexpectedparenthesis

orbracket.

>>[I,J]=ind2sub(size(b),IND);

>>

>>[I,J]=ind2sub(size(b),IND)

I=

3123

 

J=

1222

>>A(:

:

1)=[1025;4187;3263];

>>A(:

:

2)=[3541;2621;4230]

A(:

:

1)=

1025

4187

3263

 

A(:

:

2)=

3541

2621

4230

>a=2

a=

2

>>b=3

b=

3

>>a+b=

?

?

?

a+b=

|

Error:

Theexpressiontotheleftofthe

equalssignisnotavalidtargetforan

assignment.

c=a+b

c=

5

>>d=a-b

d=

-1

>>c=a*b

c=

6

>>c=a.*b

c=

6

>>ones(3)

ans=

111

111

111

>>c=ones(3)

c=

111

111

111

>>c=1:

9

c=

Columns1through7

1234567

Columns8through9

89

>>c(:

)=

?

?

?

c(:

)=

|

Error:

Expressionorstatementisincomplete

orincorrect.

>>c(:

)=1:

9

c=

Columns1through7

1234567

Columns8through9

89

>>c=ones(3)

c=

111

111

111

>>c(:

)=1:

9

c=

147

258

369

>>b(:

)=-1:

7

?

?

?

InanassignmentA(:

)=B,thenumber

ofelementsinAandB

mustbethesame.

>>b=

-4-12

-303

-214

?

?

?

b=

|

Error:

Expressionorstatementisincomplete

orincorrect.

>>d=c.*b

d=

31221

61524

91827

>>d=c*b

d=

31221

61524

91827

>>b=

-4-12

-303

?

?

?

b=

|

Error:

Expressionorstatementisincomplete

orincorrect.

>>b=

?

?

?

b=

|

Error:

Expressionorstatementisincomplete

orincorrect.

>>a=ones(30

?

?

?

a=ones(30

|

Error:

Expressionorstatementis

incorrect--possiblyunbalanced(,{,or[.

>>a=ones(3)

a=

111

111

111

>>a(:

)=1:

9

a=

147

258

369

>>b=[125;985;553]

b=

125

985

553

>>b=[125;852]

b=

125

852

>>c=a*b

?

?

?

Errorusing==>mtimes

Innermatrixdimensionsmustagree.

>>b=[52;65;82]

b=

52

65

82

>>c=a*b

c=

8536

10445

12354

>>b=[125;852]

b=

125

852

>>c=a.*b

?

?

?

Errorusing==>times

Matrixdimensionsmustagree.

>>b=[52;65;82]

b=

52

65

82

>>c=a.*b

?

?

?

Errorusing==>times

Matrixdimensionsmustagree.

>>d=c.^2

d=

72251296

108162025

151292916

>>a\b

Warning:

Matrixissingulartoworking

precision.

ans=

NaNNaN

Inf-Inf

-InfInf

>>b=[125;985;553]

b=

125

985

553

>>a\b

Warning:

Matrixissingulartoworking

precision.

ans=

NaNNaNNaN

-Inf-Inf-Inf

InfInfInf

b=[123]

b=

123

>>b=[1;2;3]

b=

1

2

3

>>e=d\b

e=

-0.0006

0.0041

>>d=ones(3)

d=

111

111

111

>>d(:

)=1:

9

d=

147

258

369

>>e=d\b

Warning:

Matrixissingulartoworking

precision.

e=

NaN

NaN

NaN

>>e=d\b

Warning:

Matrixissingulartoworking

precision.

e=

NaN

NaN

NaN

>>e=d/b

?

?

?

Errorusing==>mrdivide

Matrixdimensionsmustagree.

>>e=b/d

?

?

?

Errorusing==>mldivide

Matrixdimensionsmustagree.

>>e=b\d

e=

1.00002.28573.5714

>>a=3

a=

3

>>b=4

b=

4

>>c=a&b

c=

1

>>a=0

a=

0

>>c=a|b

c=

1

>>c=a&n

?

?

?

Undefinedfunctionorvariable'n'.

>>c=a&b

c=

0

>>e=~a

e=

1

str1='IlikeMATLAB,'

str1=

IlikeMATLAB,

>>STR2='JAVASCRPIT,ANDME!

'

STR2=

JAVASCRPIT,ANDME!

>>str3=[stristr2]

?

?

?

Undefinedfunctionorvariable'stri'.

>>str3=[str1str2]

?

?

?

Undefinedfunctionorvariable'str2'.

>>str3=[str1STR2]

str3=

IlikeMATLAB,JAVASCRPIT,ANDME!

>>sentence='I''vegotadate!

'

sentence=

I'vegotadate!

>>length(sentence)

ans=

16

>>a=double(sentence)

a=

Columns1through7

733911810132103111

Columns8through14

11632973210097116

Columns15through16

10133

>>b=char(a)

b=

I'vegotadate!

>>a=‘今日事,今日毕';

?

?

?

a=‘今日事,今日毕';

|

Error:

Theinputcharacterisnotvalidin

MATLABstatementsorexpressions.

>>a='今日事,今日毕';

>>out1=class(a)

out1=

char

>>x=chinese+1;

?

?

?

Undefinedfunctionorvariable'chinese'.

>>x=chinese+1;

?

?

?

Undefinedfunctionorvariable'chinese'.

>>x=a+1;

>>out2=ischar(x)

out2=

0

>>departments=[‘ee’;‘cs’;‘econ’]

?

?

?

departments=[‘ee’;‘cs’;‘econ’]

|

Error:

Theinputcharacterisnotvalidin

MATLABstatementsorexpressions.

>>departments=[‘ee’;‘cs’;‘econ’]

?

?

?

departments=[‘ee’;‘cs’;‘econ’]

|

Error:

Theinputcharacterisnotvalidin

MATLABstatementsorexpressions.

>>departments=['ee';'cs';'econ']

departments=

ee

cs

econ

>>departments=char('ee','cs','econ');

>>dept1=departments(1,:

dept1=

ee

>>dept2=deblank(dept1)

dept2=

ee

>>len1=length(dept1)

len1=

4

>>len2=length(dept2)

len2=

2

>>departments=char('ee','cs','econ')

departments=

ee

cs

econ

>>str1='today'

str1=

today

>>str1='today';

str2='tomorrow';

str3='today';

out1=strcmp(str1,str2)

out1=

0

>>out2=strcmp(str1,str3)

out2=

1

>>a=[]

a=

[]

>>b=ones(0,5);

>>a,b,c

a=

[]

 

b=

Emptymatrix:

0-by-5

 

c=

0

>>whosabc

NameSizeBytesClassAttributes

a0x00double

b0x50double

c1x11logical

>>a=magic(4),a(:

2)=[]

a=

162313

511108

97612

414151

 

a=

16313

5108

9612

4151

>>a(1,2)=[]

?

?

?

Subscriptedassignmentdimension

mismatch.

>>a(2:

4)=[]

a=

Columns1through7

16310615138

Columns8through9

121

a(1,1)={[143;058;729]};

>>a(1,2)={'AnneSmith'};

>>a(2,1)={3+7i};

>>a(2,2)={-pi:

pi/10:

pi};

>>b{1,1}='JamesBond';

>>b{1,2}=[12;34;56];

>>b{2,1}=pi;

>>b{2,2}=zeros(5);

>>c=[ab]

c=

[3x3double]'AnneSmith''JamesBond'[3x2double]

[3.0000+7.0000i][1x21double][3.1416][5x5double]

>>c=[a;b]

c=

[3x3double]'AnneSmith'

[3.0000+7.0000i][1x21double]

'JamesBond'[3x2double]

[3.1416][5x5double]

>>b=cell(2,3)

b=

[][][]

[][][]

>>whosb

NameSizeBytesClassAttributes

b2x348cell

>>whosb

NameSizeBytesClassAttributes

b2x348cell

>>b(1,3)={1:

3};

>>a

a=

[3x3double]'AnneSmith'

[3.0000+7.0000i][1x21double]

>>celldisp(a)

a{1,1}=

143

058

729

 

a{2,1}=

3.0000+7.0000i

 

a{1,2}=

AnneSmith

 

a{2,2}=

Columns1through9

-3.1416-2.8274-2.5133-2.1991-1.8850-1.5708-1.2566-0.9425-0.6283

Columns10through18

-0.314200.31420.62830.94251.25661.57081.88502.1991

Columns19through21

2.51332.82743.1416

 

>>cellplot(a)

a{1,2}

ans=

AnneSmith

>>a{:

}

ans=

143

058

729

 

ans=

3.0000+7.0000i

 

ans=

AnneSmith

 

ans=

Columns1through9

-3.1416-2.8274-2.5133-

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