MATLAB实验上机作业

clear

x = input('x=');

if x>=100 | x<=0

disp('jujueyoudi')

elseif x<=2

y = 10

elseif x<=70

y = 3.75*x

else x<= 100;

y = (x-70)+70*3.75

disp(['yun fei shi:' num2str(y)]); end

结果：

x=-2

jujueyoudi

x=120

jujueyoudi

x=2

y =

10

x=45

y =

168.7500

x=60

y =

225

x=90

y =

282.5000

yun fei shi:282.5

x=input('x=');

y=input('y=');

if x>=0 & y>=0

fun=x+y

elseif x>=0 & y<0

fun=x+y.^2

elseif x<0 & y>=0

fun=x.^2+y

else x<0 & y<0;

fun=x.^2+y.^2;

disp(['the jie guo is ' num2str(fun)]); end

结果：

x=5

y=5

fun =

10

x=5

y=-5

fun =

30

x=-5

y=5

fun =

30

x=-5

y=-5

fun =

50

the jie guo is 50

>>

value=input('value=')

switch(value)

case'Sunday',

disp('di yi tian');

case'Monday',

disp('di er tian');

case'Tuesday'

disp('di san tian');

case'Wednesday',

disp('di si tian');

case'Thursday',

disp('di wu tian');

case'Friday',

disp('di liu tian');

case'Saturday',

disp('di qi tian');

otherwise,

disp('The value is out of range.'); end

value=input('value=')

结果：

value='Sunday'

value =

Sunday

di yi tian

第十二题：

ebuseno=[0,0.25,0.5];

p=1E+6;

sieta=0:0.1:2*pi;

r1=p./(1-ebuseno(1)*cos(sieta));

r2=p./(1-ebuseno(2)*cos(sieta));

r3=p./(1-ebuseno(3)*cos(sieta));

minjuli1=min(r1)

maxjuli1=max(r1)

minjuli2=min(r2)

maxjuli2=max(r2)

minjuli3=min(r3)

maxjuli3=max(r3)

figure

subplot(1,3,1);

plot(sieta,r1);

subplot(1,3,2);

plot(sieta,r2);

subplot(1,3,3);

plot(sieta,r3);

figure

subplot(1,3,1);

polar(sieta,r1);

title('sieta=0')

subplot(1,3,2);

polar(sieta,r2);

title('sieta=0.25') subplot(1,3,3);

polar(sieta,r3);

title('sieta=0.5')结果：

minjuli1 =

1000000 maxjuli1 =

1000000 minjuli2 =

8.0014e+005 maxjuli2 =

1.3333e+006 minjuli3 =

6.6686e+005 maxjuli3 =

2000000

图像：

第十三题：

disp('This program calculates the day of year given the ');

5

10

11111111111x 10

6

5

10

0.80.9

1

1.1

1.2

1.3

1.4

x 10

6

0510

0.6

0.81

1.2

1.4

1.6

1.82x 10

6

sieta=0

sieta=0.25

sieta=0.5