MATLAB编程练习含答案很好的.docx

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MATLAB编程练习含答案很好的.docx

MATLAB编程练习含答案很好的

001双峰曲线图:

z=peaks(40);

mesh(z);

surf(z)

002解方程:

A=[3,4,-2;6,2,-3;45,5,4];

>>B=[14;4;23];

>>root=inv(A)*B

003傅里叶变换

loadmtlb;

subplot(2,1,1);

plot(mtlb);

>>title('原始语音信息');

>>y=fft(mtlb);

>>subplot(2,1,2);

>>yy=abs(y);

>>plot(yy);

>>title('傅里叶变换')

004输入函数:

a=input('Howmanyapples\n','s')

005输出函数

a=[1234;5678;12233445;344352334]

a=

1234

5678

12233445

344352334

disp(a)

a=

1234

5678

12233445

344352334

b=input('howmanypeople\n','s')

howmanypeople

twopeople

b=

twopeople

>>disp(b)

twopeople

>>

 

006求一元二次方程的根

a=1;b=2;c=3;

d=sqrt(b^2-4*a*c);

x1=(-b+d)/(2*a)

x1=

-1.0000+1.4142i

>>x2=(-b-d)/(2*a)

x2=

-1.0000-1.4142i

 

007求矩阵的相乘、转置、存盘、读入数据

A=[135;246;-10-2;-300];

>>B=[-13;-22;21];

>>C=A*B

C=

314

220

-3-5

3-9

>>C=C'

C=

32-33

1420-5-9

>>savemydatC

>>clear

>>loadmydatC

 

008编写数学计算公式:

A=2.1;B=-4.5;C=6;D=3.5;E=-5;

K=atan(((2*pi*A)+E/(2*pi*B*C))/D)

K=

1.3121

 

009

A=[10-1;241;-205];

>>B=[0-10;213;112];

>>H=2*A+B

H=

2-1-2

695

-3112

>>M=A^2-3*B

M=

33-6

213-2

-15-321

>>Y=A*B

Y=

-1-2-2

9314

5710

>>R=B*A

R=

-2-4-1

-2414

-1410

>>E=A.*B

E=

000

443

-2010

>>W=A\B

W=

0.3333-1.33330.6667

0.25001.00000.2500

0.3333-0.33330.6667

>>P=A/B

P=

-2.00003.0000-5.0000

-5.00003.0000-4.0000

7.0000-9.000016.0000

>>Z=A.\B

Warning:

Dividebyzero.

Z=

0-Inf0

1.00000.25003.0000

-0.5000Inf0.4000

>>D=A./B

Warning:

Dividebyzero.

D=

Inf0-Inf

1.00004.00000.3333

-2.000002.5000

 

010

a=4.96;b=8.11;

>>M=exp(a+b)/log10(a+b)

M=

4.2507e+005

 

011求三角形面积:

a=9.6;b=13.7;c=19.4;

>>s=(a+b+c)/2;

>>area=sqrt(s*(s-a)*(s-b)*(s-c))

area=

61.1739

 

012逻辑运算

A=[-10-68;-94012.3;00-5.1-2;0-230-7];

>>B=A(:

1:

2)

B=

-10

-94

00

0-23

>>C=A(1:

2,:

C=

-1.00000-6.00008.0000

-9.00004.0000012.3000

>>D=B'

D=

-1-900

040-23

>>A*B

ans=

1.0000-184.0000

-27.0000-266.9000

046.0000

207.000069.0000

>>C

ans=

0010

1000

>>C&D

ans=

1000

0101

>>C|D

ans=

1111

1101

>>~C|~D

ans=

0111

1010

013矩阵运算练习:

A=[895;36-711;21-85]

A=

895

36-711

21-85

>>B

B=

-13-2

203

-319

>>RT=A*B

RT=

-52956

-831196

-5268-21

>>QW=A.*B

QW=

-827-10

72033

-63-845

>>ER=A^3

ER=

627233422944

15714-8565260

8142-19062390

>>BF=A.^3

BF=

512729125

46656-3431331

9261-512125

>>A/B

ans=

3.13414.9634-0.4024

-1.256112.5244-3.2317

-1.98786.4512-2.0366

>>EKV=B\A

EKV=

10.7195-1.26833.5244

9.47561.58543.7195

4.8537-1.48781.3171

>>KDK=[A,B]

KDK=

895-13-2

36-711203

21-85-319

>>ERI=[A;B]

ERI=

895

36-711

21-85

-13-2

203

-319

 

014一般函数的调用:

A=[23488390848939];

>>S=sum(A)

S=

2301

>>min(A)

ans=

2

>>EE=mean(A)

EE=

383.5000

>>QQ=std(A)

QQ=

419.3794

>>AO=sort(A)

AO=

23488390848939

>>yr=norm(A)

yr=

1.3273e+003

>>RT=prod(A)

RT=

1.8583e+012

>>gradient(A)

ans=

32.000043.0000178.0000380.0000274.500091.0000

>>max(A)

ans=

939

>>median(A)

ans=

239

>>diff(A)

ans=

325430245891

>>length(A)

ans=

6

>>sum(A)

ans=

2301

>>cov(A)

ans=

1.7588e+005

>>

 

015矩阵变换:

A=[344423;83423;34552]

A=

344423

83423

34552

>>tril(A)

ans=

3400

8340

34552

>>triu(A)

ans=

344423

03423

002

>>diag(A)

ans=

34

34

2

norm(A)

ans=

94.5106

>>rank(A)

ans=

3

>>det(A)

ans=

-23462

>>trace(A)

ans=

70

>>null(A)

ans=

Emptymatrix:

3-by-0

>>eig(A)

ans=

80.1587

12.7671

-22.9257

>>poly(A)

ans=

1.0e+004*

0.0001-0.0070-0.11072.3462

>>logm(A)

Warning:

PrincipalmatrixlogarithmisnotdefinedforAwith

nonpositiverealeigenvalues.Anon-principalmatrix

logarithmisreturned.

>Infunmat153

Inlogmat27

ans=

3.1909+0.1314i1.2707+0.1437i0.5011-0.2538i

0.4648+0.4974i3.3955+0.5438i0.1504-0.9608i

0.2935-1.2769i0.8069-1.3960i3.4768+2.4663i

>>fumn(A)

Undefinedcommand/function'fumn'.

>>inv(A)

ans=

0.0510-0.0502-0.0098

-0.03260.03040.0255

0.03050.0159-0.0343

>>cond(A)

ans=

8.5072

>>chol(A)

Errorusing==>chol

Matrixmustbepositivedefinite.

>>lu(A)

ans=

34.000044.000023.0000

0.235323.647117.5882

1.00000.4652-29.1816

>>pinv(A)

ans=

0.0510-0.0502-0.0098

-0.03260.03040.0255

0.03050.0159-0.0343

>>svd(A)

ans=

94.5106

22.3456

11.1095

>>expm(A)

ans=

1.0e+034*

2.18974.39681.9382

1.31542.64121.1643

1.87823.77121.6625

>>sqrtm(A)

ans=

5.2379+0.2003i3.4795+0.2190i1.8946-0.3869i

0.5241+0.7581i5.1429+0.8288i2.0575-1.4644i

3.0084-1.9461i4.7123-2.1276i2.1454+3.7589i

>>

 

016多项式的计算:

A=[344423;83423;34552]

A=

344423

83423

34552

>>P=poly(A)

P=

1.0e+004*

0.0001-0.0070-0.11072.3462

>>PPA=poly2str(P,'X')

PPA=

X^3-70X^2-1107X+23462

 

017多项式的运算:

p=[2683];w=[325602];

>>m=conv(p,w)

m=

64304592548180166

>>[q,r]=deconv(w,p)

q=

16

 

r=

0-40-128-46

>>dp=polyder(w)

dp=

961120

>>[num,den]=polyder(w,p)

num=

80512724312-16

 

den=

42468108100489

>>b=polyfit(p,w,4)

Warning:

Polynomialisnotunique;degree>=numberofdatapoints.

>Inpolyfitat74

b=

-0.67049.2037-32.2593098.1333

>>r=roots(p)

r=

-1.2119+1.0652i

-1.2119-1.0652i

-0.5761

 

018求多项式的商和余

p=conv([102],conv([14],[11]))

p=

156108

>>q=[1011]

q=

1011

>>[w,m]=deconv(p,q)

w=

15

 

m=

00543

>>cq=w;cr=m;

>>disp([cr,poly2str(m,'x')])

5x^2+4x+3

>>disp([cq,poly2str(w,'x')])

x+5

 

019将分式分解

a=[156];b=[1];

>>[r,p,k]=residue(b,a)

r=

-1.0000

1.0000

 

p=

-3.0000

-2.0000

 

k=

[]

 

020计算多项式:

a=[123;456;789];

>>p=[3023];

>>q=[23];

>>x=2;

>>r=roots(p)

r=

0.3911+1.0609i

0.3911-1.0609i

-0.7822

>>p1=conv(p,q)

p1=

694129

>>p2=poly(a)

p2=

1.0000-15.0000-18.0000-0.0000

>>p3=polyder(p)

p3=

902

>>p4=polyval(p,x)

p4=

31

 

021求除式和余项:

[q,r]=deconv(conv([102],[14]),[111])

 

022字符串的书写格式:

s='student'

s=

student

>>name='mary';

>>s1=[names]

s1=

marystudent

>>s3=[nameblanks(3);s]

s3=

mary

student

>>

 

023交换两个数:

clear

clc

a=[12345];

b=[678910];

c=a;

a=b;

b=c;

a

b

24If语句

n=input('enteranumber,n=');

ifn<10

n

end

 

025if双分支结构

a=input('enteranumber,a=');

b=input('enteranumber,b=');

ifa>b

max=a;

else

max=b;

end

max

 

026三个数按照由大到小的顺序排列:

A=15;B=24;C=45;

ifA

T=A;A=B;B=T;

elseifA

T=A;A=C;C=T;

elseifB

T=B;B=C;C=T;

end

A

B

C

 

027建立一个收费优惠系统:

price=input('pleasejinputtheprice:

price=')

switchfix(price/100)

case[0,1]

rate=0;

case[2,3,4]

rate=3/100;

casenum2cell(5:

9)

rate=5/100;

casenum2cell(10:

24)

rate=8/100;

casenum2cell(25:

49)

rate=10/100;

otherwise

rate=14/100;

end

price=price*(1-rate)

 

028:

while循环语句

i=0;s=0;

whilei<=1212

s=s+i;

i=i+1;

end

s

029,用for循环体语句:

sum=0;

fori=1:

1.5:

100;

sum=sum+i;

end

sum

030循环的嵌套

s=0;

fori=1:

1:

6;

forj=1:

1:

8;

s=s+i^j;

end;

end;

s

 

031continue语句的使用:

fori=100:

120;

ifrem(i,7)~=0;

continue;

end;

i

end

 

032

x=input('输入X的值x=')

ifx<1

y=x^2;

elseifx>1&x<2

y=x^2-1;

else

y=x^2-2*x+1;

end

y

 

033求阶乘的累加和

sum=0;

temp=1;

forn=1:

10;

temp=temp*n;

sum=sum+temp;

end

sum

 

034对角线元素之和

sum=0;

a=[1234;5678;9101112;13141516];

fori=1:

4;

sum=sum+a(i,i);

end

sum

035用拟合点绘图

A=[1215.3161825];

B=[5080118125150.8];

plot(A,B)

 

036绘制正玄曲线:

x=0:

0.05:

4*pi;

y=sin(x);

plot(x,y)

 

037绘制向量

x=[123456;789101112;131415161718]

plot(x)

x=[00.20.50.70.60.71.21.51.61.92.3]

plot(x)

x=0:

0.2:

2*pi

y=sin(x)

plot(x,y,'m:

p')

 

038在正弦函数上加标注:

t=0:

0.05:

2*pi;

plot(t,sin(t))

set(gca,'xtick',[01.43.1456.28])

xlabel('t(deg)')

ylabel('magnitude(v)')

title('thisisaexample()\rightarrow2\pi')

text(3.14,sin(3.14),'\leftarrowthiszerofor\pi')

 

039添加线条标注

x=0:

0.2:

12;

plot(x,sin(x),'-',x,1.5*cos(x),':

');

legend('First','Second',1)

 

040使用holdon函数

x=0:

0.2:

12;

plot(x,sin(x),'-');

holdon

plot(x,1.5*cos(x),':

');

 

041一界面多幅图

x=0:

0.05:

7;

y1=sin(x);

y2=1.5*cos(x);

y3=sin(2*x);

y4=5*cos(2*x);

subplot(221);plot(x,y1);title('sin(x)')

subplot(222);plot(x,y2);title('cos(x)')

subplot(223);plot(x,y3);title('sin(2x)')

subplot(224);plot(x,y4);title('cos(2x)')

042染色效果图

x=0:

0.05:

7;

y1=sin(x);

y2=1.5*cos(x);

y3=sin(2*x);

y4=5*cos(2*x);

subplot(221);plot(x,y1);title('sin(x)');fill(x,y1,'r')

subplot(222);plot(x,y2);title('cos(x)');fill(x,y2,'b')

subplot(223);plot(x,y3);title('sin(2x)');fill(x,y3,'k')

subplot(224);plot(x,y4);title('cos(2x)');fill(x,y4,'g')

 

043特殊坐标图

clc

y=[0,0.55,2.5,6.1,8.5,12.1,14.6,17,20,22,22.1]

subplot(221);plot(y);

title('线性坐标图');

subplot(222);semilogx(y);

title('x轴对数坐标图');

subplot(223);semilogx(y);

title('y轴对数坐标图');

subplot(224);loglog(y);

title('双对数坐标图')

 

t=0:

0.01:

2*pi;

r=2*cos(2*(t-pi/8));

polar(t,r)

044特殊函数绘图:

fplot('cos(tan(pi*x))',[-0.4,1.4])

fplot('sin(exp(pi*x))',[-0.4,1.4])

 

045饼形图与条形图:

x=[820362412];

subplot(221);pie(x,[10001]);

title('饼图');

subplot(222);bar(x,'group');

title('垂直条形图');

subplot(223);bar(x,'stack');

title('累加值为纵坐标的垂直条形图');

subplot(224);barh(x,'group');

title('水平条形图');

 

046梯形图与正弦函数

x=0:

0.1:

10;

y=sin(x);

subplot(121);stairs(x);

subplot(122);stairs(x,y);

 

047概率图

x=randn(1,1000);

y=-2:

0.1:

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