Matlab基础与应用教程答案人民邮电出版社Word下载.docx
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Matlab基础与应用教程答案人民邮电出版社Word下载.docx
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sin(x*x+y*y)/sqrt(tan(abs(x+y)))+pi
2.a=-3.0:
0.1:
3.0;
exp(-0.3*a).*sin(a+0.3)
3.x=[2,4;
-0.45,5];
log(x+sqrt(1+x.*x))/2
4.A=[3,54,2;
34,-45,7;
87,90,15];
B=[1,-2,67;
2,8,74;
9,3,0];
(1)A*B
ans=
1294324197
7-407-1052
40259112489
A.*B
3-108134
68-360518
7832700
(2)A^3
-28917240246-4368
137883-25910127669
17133325250438673
A.^3
271574648
39304-91125343
6585037290003375
(3)A/B
-5.88455.3549-0.2028
6.3554-5.65964.3293
-6.63256.20789.0241
B/A
30.285519.2643-8.5614
33.439421.1547-9.3974
-0.7443-0.39380.2830
(4)[A,B]
35421-267
34-4572874
879015930
[A([1,3],:
);
B^2]
3542
879015
600183-81
684282726
156825
5.a=1+2i;
b=3+4i;
c=exp(pi*i/6)
c=
0.8660+0.5000i
c+a*b/(a+b)
1.6353+1.8462i
第2章
3.s=0;
forn=0:
63
s=s+2^n;
end
disp(s)
n=0:
63;
s=sum(2.^n)
1.
x=input('
输入一个四位整数:
'
y=[fix(x/1000),mod(fix(x/100),10),mod(fix(x/10),10),mod(x,10)]
z=mod((y+7),10)
x=z(3)*1000+z(4)*100+z
(1)*10+z
(2)
2.
gh=input('
输入工号'
h=input('
输入工时'
dj=84;
ifh>
120
gz=dj*120+1.15*dj*(h-120);
elseifh<
60
gz=dj*h-700;
else
gz=dj*h;
formatbank;
display([gh,gz])
3.
循环结构
n=input('
inputn:
s=0;
fork=1:
n
s=s+1/k^2;
display(sqrt(s*6))
向量运算
k=1:
n;
display(sqrt(sum(1./k.^2)*6))
4.
y=0;
k=0;
whiley<
3
k=k+1;
y=y+1/(2*k-1);
display([k-1,y-1/(2*k-1)])
5.
x0=0;
x=1;
a=input('
a='
b=input('
b='
whileabs(x-x0)>
=1e-5&
&
k<
500
x0=x;
x=a/(b+x0);
display([k,x]);
display([(-b+sqrt(b^2+4*a))/2,(-b-sqrt(b^2+4*a))/2]);
6.
y=fun(40)/(fun(30)+fun(20))
(1)函数文件fun.m
functionf=fun(n)
f=n+log(n^2+5);
(2)函数文件fun.m
a=1:
f=sum(a.*(a+1));
第3章
4.
t=0:
0.01:
1.5;
y=sqrt(3)/2*exp(-4*t).*sin(4*sqrt(3)*t+pi/3);
x=-10:
10;
y=linspace(-6,6,size(x,2))
z=x.^3+3*x.*y.^2;
plot3(x,y,z)
6.
x=100:
100:
400;
y=100:
z=[636,697,624,478;
698,712,630,478;
680,674,598,412;
662,626,552,334];
[X,Y]=meshgrid(x,y);
mesh(X,Y,z)
1.
(1)x=-10:
plot(x,x-x.^3/3/2)
(2)plot(x,exp(-x.*x/2)/2/pi)
(3)x=-8:
8;
plot(x,sqrt((64-x.*x)/2))
(4)t=0:
pi/100:
6*pi;
plot(t.*sin(t),t.*cos(t))
2.
(1)
x1=linspace(0,1,100);
y1=2*x1-0.5;
t=linspace(0,pi,100);
x=sin(3*t).*cos(t);
y=sin(3*t).*sin(t);
plot(x1,y1,'
r-'
x,y,'
b:
text(0.4,1,'
y=2x-0.5'
text(-0.4,0.5,'
x=sin(3t)cos(t)'
text(-0.4,0.3,'
y=sin(3t)sin(t)'
(2)
subplot(1,2,1);
scatter(x1,y1,10)
title('
subplot(1,2,2);
scatter(x,y,10)
x=1:
1:
100;
y=sin(1./x);
plot(x,y)
fplot('
sin(1/x)'
[1,100])
subplot(2,2,1);
bar(t,y);
subplot(2,2,2);
stairs(t,y);
subplot(2,2,3);
stem(t,y)
subplot(2,2,4);
semilogy(t,y);
theta=linspace(-pi,pi,100);
ro=5.*cos(theta)+4;
polar(theta,ro);
fi=linspace(0,2*pi,100);
a=1
r=a.*(1+cos(fi));
polar(fi,r);
pi/20:
2*pi;
x=exp(-t./20).*cos(t);
y=exp(-t./20).*sin(t);
z=t;
plot3(x,y,z);
1;
x=t;
y=t.^2;
z=t.^3;
7.
x=-30:
0;
y=0:
30;
[x,y]=meshgrid(x,y);
z=10.*sin(sqrt(x.^2+y.^2))./sqrt(1+x.^2+y.^2);
meshc(x,y,z);
8.
x=linspace(-3,3,100);
y=linspace(-3,3,100);
[xy]=meshgrid(x,y);
fxy=-5./(1+x.^2+y.^2);
i=find(abs(x)<
=0.8&
abs(y)<
=0.5);
fxy(i)=NaN;
surf(x,y,fxy)
9.
u=linspace(1,10,100);
v=linspace(-pi,pi,100);
[u,v]=meshgrid(u,v);
x=3.*u.*sin(v);
y=2.*u.*cos(v);
z=4*u.^2;
x=3*u.*sin(v);
y=2*u.*cos(v);
surf(x,y,z);
shadinginterp;
light('
position'
[1,0,1]);
10.
y=sin(t);
comet(t,y)
第4章
5.
(1)A=eye(3);
(2)C=100+(200-100)*rand(5,6);
(3)D=1+sqrt(0.2)*randn(1,500);
(4)E=ones(size(A));
(5)A=A+30*eye(size(A));
(6)B=diag(diag(A))
P=pascal(5);
H=hilb(5);
Dp=det(P);
Dh=det(H);
Kp=cond(P);
Kh=cond(H);
P矩阵的性能更好,因为Kp较小
2.
A=[1,-1,2,3;
0,9,3,3;
7,-5,0,2;
23,6,8,3]
B=[3,pi/2,45;
32,-76,sqrt(37);
5,72,4.5e-4;
exp
(2),0,97]
A1=diag(A);
B1=diag(B);
A2=triu(A);
B2=triu(B);
A3=tril(A);
B3=tril(B);
rA=rank(A);
rB=rank(B);
nA=norm(A);
nb=norm(B);
cA=cond(A);
cB=cond(B);
A=[31,1,0;
-4,-1,0;
4,-8,-2];
[V,D]=eig(A);
A=diag([-1,-1,-1,-1],-1)+diag([-1,-1,-1,-1],1)+diag([2,2,2,2,2])
b=[1,0,0,0,0]'
;
x1=inv(A)*b;
x2=A\b;
[L,U]=lu(A);
x3=U\(L\b);
[Q,R]=qr(a);
[Q,R]=qr(A);
x4=R\(Q\b)
R=chol(A);
x5=R\(R'
\b)
B=sparse(A);
x1=inv(B)*b;
x2=B\b;
[L,U]=lu(B);
第5章
3.
A=randn(10,5);
mean(A)
std(A)
max(max(A))
min(min(A))
sum(A,2)
sum(sum(A))
sort(A,1)
sort(A,2,'
descend'
A=rand(1
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