The MATLAB NotebookWord文档格式.docx
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x4=x(4:
-1:
1)
x=
1.0e+004*
0.00020.00010.00020.0003+2.0000i
1.7895
0.00020.00010.0003+2.0000i
0.00010.00020.0003+2.0000i
x4=
0.0003+2.0000i0.00020.00010.0002
二维数组的寻访
A=rand(3,5)
A1=A(1,:
)
A2=A(1:
2,2:
5)
A3=A([1,3],[2,5])
A=
0.95010.48600.45650.44470.9218
0.23110.89130.01850.61540.7382
0.60680.76210.82140.79190.1763
A1=
A2=
0.48600.45650.44470.9218
0.89130.01850.61540.7382
A3=
0.48600.9218
0.76210.1763
数组与矩阵运算比较
A=[-1,-2,-3;
-4,-5,-6;
-7,-8,-9]
B=[1,2,3;
4,5,6;
7,8,9]
C=A+B*i
CN=C.'
CM=C'
ABN=A.*B
ABM=A*B
-1-2-3
-4-5-6
-7-8-9
B=
456
789
C=
-1.0000+1.0000i-2.0000+2.0000i-3.0000+3.0000i
-4.0000+4.0000i-5.0000+5.0000i-6.0000+6.0000i
-7.0000+7.0000i-8.0000+8.0000i-9.0000+9.0000i
CN=
-1.0000+1.0000i-4.0000+4.0000i-7.0000+7.0000i
-2.0000+2.0000i-5.0000+5.0000i-8.0000+8.0000i
-3.0000+3.0000i-6.0000+6.0000i-9.0000+9.0000i
CM=
-1.0000-1.0000i-4.0000-4.0000i-7.0000-7.0000i
-2.0000-2.0000i-5.0000-5.0000i-8.0000-8.0000i
-3.0000-3.0000i-6.0000-6.0000i-9.0000-9.0000i
ABN=
-1-4-9
-16-25-36
-49-64-81
ABM=
-30-36-42
-66-81-96
-102-126-150
数组的关系运算和逻辑运算
数组的关系运算
A=1:
9,B=10-A,r0=(A<
4),r1=(A==B),r2=(A>
B)
123456789
987654321
r0=
111000000
r1=
000010000
r2=
000001111
数组的逻辑运算
A=[0,2,3,4;
1,3,5,0];
B=[1,0,5,3;
1,5,0,5]
C=A&
B
D=A|B
E=~A
1053
1505
0011
1100
D=
1111
E=
1000
0001
字符串数组创建
a='
sumsption'
b='
学院'
sumsption
b=
学院
size(a)
ans=
19
b=a(end:
noitpsmus
A='
机械电子工程'
size(A)
机械电子工程
16
B='
'
size(B)
18
B=[A,'
研究院'
]
机械电子工程研究院
串转换函数
a=rand(2,2),b='
example'
c=abs(b)
d=char(c)
e=num2str(a)
0.40570.9169
0.93550.4103
example
10112097109112108101
e=
0.405710.9169
0.935470.41027
|构架数组
student_rec.number=1;
student_rec.name='
AlanShearer'
;
student_rec.height=180;
student_rec.test=[100,80,75;
77,60,92;
67,28,90;
100,89,78];
student_rec
student_rec.test
student_rec=
number:
1
name:
'
height:
180
test:
[4x3double]
1008075
776092
672890
1008978
t=(0:
pi/50:
2*pi)'
k=0.4:
0.1:
1;
X=cos(t)*k;
plot(X)
plot(t,X)
pi/100:
pi)'
y1=sin(t)*[1,-1];
y2=sin(t).*sin(9*t);
plot(t,y1,'
m:
t,y2,'
g'
t1=pi*(0:
9)/9;
y3=sin(t1).*sin(9*t1);
plot(t,y2,'
b'
t1,y3,'
bp'
)
t=0:
0.01:
pi;
B=[1,3]'
w=[2,5]'
y=sin(w*t).*exp(-B*t);
plot(t,y(1,:
),'
-.'
t,y(2,:
))
legend('
w=2,B=1,'
'
w=5,B=3'
)
xlabel('
t'
),ylabel('
y'
title('
y=sin(wt)*exp(-Bt)'
0.02:
3;
xi=0.5;
wn=5;
sxi=sqrt(1-xi^2);
sita=atan(sxi/xi);
wd=wn*sxi;
y1=1-exp(-xi*wn*t).*sin(wd*t+sita)/sxi;
y2=wn*exp(-xi*wn*t).*sin(wd*t)/sxi;
plotyy(t,y1,t,y2)
t=(pi*(0:
1000)/1000)'
y1=sin(t);
y2=sin(10*t);
y12=sin(t).*sin(10*t);
subplot(2,2,1),plot(t,y1);
axis([0,pi,-1,1])
subplot(2,2,2),plot(t,y2);
subplot('
position'
[0.2,0.05,0.6,0.45])
plot(t,y12,'
b-'
t,[y1,-y1],'
r:
);
axis([0,pi,-1,1])
ezplot('
x^2+x*y+y^2-10'
axis([-4,4,-4,4])
x=-4:
4;
y=x;
[X,Y]=meshgrid(x,y);
Z=X.^2+Y.^2;
subplot(1,3,1),surf(X,Y,Z);
subplot(1,3,2),mesh(X,Y,Z);
subplot(1,3,3),plot3(x,y,x.^2+y.^2);
boxon
clf
[x,y]=meshgrid(-3:
3,-2:
2);
z=(x.^2+2*x).*exp(-x.^2-y.^2-x.*y);
subplot(1,2,1),mesh(x,y,z),
axis([-3,3,-2,2,-0.5,1.0])
透视'
hiddenoff
subplot(1,2,2),mesh(x,y,z)
消隐'
hiddenon
axis([-3,3,-2,2,-0.5,1.0])
2)*pi;
x=sin(t);
y=cos(t);
z=cos(2*t);
subplot(1,2,1),plot3(x,y,z,'
x,y,z,'
bd'
view([-82,58])
视点控制'
),boxon
subplot(1,2,2),plot(x,y,z,'
boxon,title('
无视点控制'
?
Errorusingplot
Stringargumentisanunknownoption.
subplot(1,3,1),surf(peaks),alpha(0)
完全透明'
colormap(summer);
subplot(1,3,2),surf(peaks),alpha(0.5)
半透明'
colormap(summer)
subplot(1,3,3),surf(peaks),alpha
(1)
完全不透明'
colormap(summer)
z=(x.^2-1.4*x).*exp(-x.^2-y.^2+x.*y);
figure
(1)
surf(x,y,z),axis([-3,3,-2,2,-0.5,1.0])
shadingflat'
),shadingflat
figure
(2)
shadinginterp'
),shadinginterp
figure(3)
shadingfacted'
),shadingfacted
Errorusingshading(line106)
Shadingmethodsareflat,faceted,andinterp.
ezsurf('
x.^2+y.^2'
[-10,10],100)
shadingflat
clf;
t=[0:
18]'
forx=0.2:
0.2:
0.8
b=sqrt([1-x^2]);
z=atan(b/x);
y1=-t*x;
y2=t*b+z;
y=1-exp(y1).*sin(y2)/b;
plot(x,y),holdon
end
a
(1)=1;
a
(2)=1;
i=2;
whilea(i)<
=10000
a(i+1)=a(i-1)+a(i);
i=i+1;
end;
i,a(i)
i=
21
10946
switchround(10*x)
case2
plot(t,y,'
r-'
),holdon
case4
b*'
),hold
case6
k.'
otherwise
g+'
end
t(秒)'
),title('
二阶系统阶跃响应'
{\xi}=0.2'
{\xi}=0.4'
{\xi}=0.6'
{\xi}=0.8'
Currentplotreleased
Warning:
Ignoringextralegendentries.
{_>
Inlegendat291}_
clear,N=4;
A=magic(3);
try
A_N=A(N,:
catch
A_end=A(end,:
lasterr
A_end=
492
Indexexceedsmatrixdimensions.
sa=circle(10,'
circle(10,'
k'
Undefinedfunction'
circle'
forinputargumentsoftype'
double'
.
functiony1=mainfun(a,s)
a)/a*2*pi;
y1=subfun(4,s);
functiony2=subfun(a,s)
ss='
a*exp(i*t)'
switchs
case{'
base'
caller'
}
y2=evalin(s,ss);
case'
self'
y2=eval(ss);
clear
a=30;
sss={'
};
fork=1:
3
y0=mainfun(8,sss{k});
subplot(1,3,k)
plot(real(y0),imag(y0),'
r'
lineWidth'
3)
axissquare
end
mainfun'
.
t=pi;
evel('
theta=t/2,y1=sin(theta)'
evel'
char'