matlab第五章部分课后答案.pdf

第五章

1.

(1)x=-10:0.1:10;

y=100./(1+x.^2);

plot(x,y)

(2)x=-10:0.1:10;

y=1/(2*pi)*exp(-x.^2/2);

plot(x,y)

(3)ezplot(x^2+y^2=1)

(4)

t=-10:0.1:10;

x=t.^2;

y=5*t.^3;

plot(x,y)

2.

(1)

theta=0:0.01:2*pi;

rho=5*cos(theta)+4;

polar(theta,rho)

(2)

theta=0.001:0.1:2*pi;

rho=12./(sqrt(theta);

polar(theta,rho)

(3)theta=0:0.1:2*pi;

rho=5./(cos(theta)+eps)-7;

polar(theta,rho)

(4)

theta=0:0.1:2*pi;

rho=pi/3.*theta.^2;

polar(theta,rho)

3.

(1)

t=0:pi/100:2*pi;

x=cos(t);

y=sin(t);

z=t;

plot3(x,y,z)

(2)

u=0:pi/100:2*pi;

v=0:pi/100:2*pi;

x=(1+cos(u)).*cos(v);

y=(1+cos(u)).*sin(v);

z=sin(u);

plot3(x,y,z)

(3)

z=ones(50,50)*5;

surf(z);

(4)

[x,y,z]=sphere();

surf(10*x,10*y,10*z);

4.

clc

clearall

subplot(2,2,1)

t=-pi/4:pi/2:(2*pi-pi/4);

x=cos(t);

y=sin(t);

plot(x,y);

axis([-1.21.2-1.21.2])

axisequal

subplot(2,2,2)

t=0:pi/50:2*pi;

x=cos(t);

y=sin(t);

plot(x,y);

axis([-1.21.2-1.21.2])

axisequal

subplot(2,2,3)

t=0:2*pi/3:2*pi;

x=cos(t);

y=sin(t);

plot(x,y);

axis([-1.21.2-1.21.2])

axisequal

subplot(2,2,4)

t=0:pi/3:2*pi;

x=cos(t);

y=sin(t);

plot(x,y);

axis([-1.21.2-1.21.2])

axisequal

5.

plot函数：

clc

clearall

x=linspace(-10,10,200);

y=[];

forx0=x

ifx00

y=[y,x0.^2+(1+x0).^(1/4)+5];

elseifx0==0

y=[y,0];

elseifx00

y=[y,x0.^3+sqrt(1-x0)-5];

end

end

plot(x,y)

fplot函数：

fplot((x0).*(x.^3+sqrt(1-x)-5)+(x==0).*0+(x0).*(x.^2+(1+x).^(1/4)+5),[-10,10])

6.

clc

clearall

t=0:pi/50:pi;

x=sin(3*t).*cos(t);

y=sin(3*t).*sin(t);

plot(x,y);

holdon;

xx=-0.6:0.02:0.6;

yy=2*xx-0.5;

plot(xx,yy);

axisequal

7

clc

clearall

x=[450.6395.9410.2450.9]

%plot(x);

pie(x);