数模实例一电阻问题Word文档下载推荐.docx
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root(ans)
root(A)
helproot
polyval(p1,20)
roots(p1)
Dp=polyder(p1)
theta=0:
0.01:
6*pi;
rho=5*sin(4*theta/3);
polar(theta,rho)figure;
polar(theta,rho)figure;
polar(theta,rho)
%--2012/5/1310:
11--%
figure;
rho=5*sin(theta/3);
polyvalm(p1,20)
eig(compan(p1))
diff(x^3)
diff(x^4-(69*x^3)/10-(3863*x^2)/50-(8613*x)/100+12091/20)
symx
symsx
%--2012/6/1011:
49--%
A=[11121314;
21222324;
31323334;
41424344];
rank(A)
[l,u]=lu(A)
x=[-pi:
0.05:
pi];
y=sin(tan(x))-tan(sin(x));
plot(x,y)
ezplot('
x^2*sin(x+y^2)+y^2*exp(x+y)+5*cos(x^2+y)'
)
[X,Y]=meshgrid(-10:
0.5:
10);
a=sqrt(X.^2+Y.^2)+eps;
Z=sin(a)./a;
mesh(X,Y,Z);
symsxab;
f=x*(1+a/x)^x*sin(b/x);
L=limit(f,x,inf)
symst;
f=t^2*exp(-2*t)*sin(t+pi);
F=laplace(f)
symsabcx;
solve('
a*x^2+b*x+c'
symx;
cos(2*x)+sin(x)'
A=[123;
-137;
903];
b=[147]'
;
x=A\b
x2=inv(A)*b
A=[123];
B=[3,4,5];
C=cross(A,B)
S=dot(A,cross(B,C))
symsx;
int((x+sin(x))/(1+cos(x)),x,0,pi/2)
int(cos(x)^5*sin(x),x,0,pi/2)
a=limit(x^2/(sin(x/3))^2,0)
b=limit((tan(x)-sin(x))/(sin(x))^3,0)
d=[7408174405743737469174256739987400674099];
m=mean(d)
v=var(d)
xdwc=sqrt(v)/m
minZ=-6X1-4X2
a=[2,3;
4,2];
c=[-6,-4];
b=[100,120];
vlb=[0,0];
vub=[];
[x,lam]=lp(c,a,b,vlb,vub)
[x,lam]=lip(c,a,b,vlb,vub)
vub=[1010]
vub=[];
a=[330335340345350355360365370375385390405425];
b=[19792182226521992221226223022307236624292477261928433899];
plot(a,b,a,b,'
xlabel('
电压(V)'
ylabel('
计数'
title('
坪特性曲线'
function[x,y]=jitu(t,j)
fori=1:
t
x=i;
y=t-x;
if2*x+4*y==j
break;
end
[x,y]=jitu(t,j)
symsxytj;
A={'
张三'
'
李四'
王五'
};
B={201001040081,201001040082,201001040083};
C={'
男'
女'
D={19840111,19850215,19870623};
E={'
语文'
数学'
英语'
物理'
F={91929394,89888786,79787776};
MM={A,B,C,D,E,F}
A.a1='
A.a2='
A.a3='
C.c1='
%--2012/7/1115:
vap(pi,300)
vap(pi,3)
symsvar_listvar_props
vap(pi,30)
vpa(pi,300)
A=[1,2,3;
45,6;
7,80]
7,80];
A=[[A;
[123]],[1;
2;
3;
4]];
B=[1+9i,2+8i,3+7j;
4+6j,5+5i,6+4i;
7+3i,8+2j1i]
v1=0:
0.2:
v2=0:
-0.1:
pi,v3=0:
pi,v4=pi:
-1:
B1=A(1:
2:
end,:
B2=A([3,2,1],[1,1,1])
B3=A(:
end;
1)
end;
end:
4,5,6;
7,8,0];
B=A.^A
C=A^(1/3),e=norm(A-C^3)
C=A^(1/3)
e=norm(A-C^3)
C=A.^(1/3)
e=norm(A-C.^3)
j1=exp(sqrt(-1)*2*pi/3);
A1=C*j1,A2=C*j1^2,norm(A-A1^3),norm(A-A1^3)
find(A>
=5)'
[i,j]=find(A>
=5)
a1=all(A>
=5),a2=any(A>
all(A(:
)>
symss;
P=(s+3)^2*(S^2+3*s+2)*(s^3+12*s^2+48*s+64)
P=(s+3)^2*(s^2+3*s+2)*(s^3+12*s^2+48*s+64)
P1=simple(P)
[P2,m]=simple(P)
P3=expand(P)
symssz;
P=(s+3)^2*(s^2+3*s+2)*(s^3+12*s^2+48*s+64);
P1=simple(subs(P,s,(z-1)/(z+1))),latex(P1)
helplatex
LATEX(P1)
P1=simple(subs(P,s,(z-1)/(z+1))),latex(P1)
P1=simple(subs(P,s,(z-1)/(z+1))),LaTeX(P1)
%--2012/7/128:
29--%
%--2012/7/1215:
31--%
A=[-0.2765,05772,1.4597,2.1091,1.191,-1.6187];
v1=floor(A),v2=ceil(A),v3=round(A),v4=fix()
v4=fix(A)
A=[-0.2765,0.5772,1.4597,2.1091,1.191,-1.6187];
v1=floor(A),v2=ceil(A),v3=round(A),v4=fix(A)
A=hilb(3)
[n,d]=rat(A)
helprat
m=sym(1856120);
n=sym(1483720);
gcd(m,n),lcm(m,n),factor(lcm(n,m))
A=1:
1000;
B=A(isprime(A))
s1=0;
100,s1=s1+i;
end,s1
s2=0;
i=1;
while(i<
=100),s2=s2+i;
i=i+1;
end,s2
s=0;
m=0;
while(s<
=10000),m=m+1;
s=s+m;
end,s,m
tic,s=0;
100000,s=s+1/2^i+1/3^i;
toc
tic,i=1:
100000;
s=sum(1./2.^i+1./3.^i);
10000,s=s+i;
ifs>
10000,break;
end,end
[m1,s1]=findsum(145323)
helpmyhilb
A1=myhilb(3,4)
A2=myhilb(4)
my_fact(11)
tic,my_fibo(25),toc
tic,a=[1,1];
fork=3:
100,a(k)=a(k-1)+a(k+2);
end,toc
P=[12405];
Q=[12];
F=[123];
D=convs(P,Q,F)
E=convs(convs(P,Q),F)
G=convs(P,Q,F,[1,1],[1,3],[1,1])
-1.8,-1.799:
.001:
-1.2,-1.2:
1.2,...1.201:
0.001:
1.8,1.81:
y=sin(tan(x))-tan(sin(x));
s
ds
45
34
4e
1.2,1.201:
%--2012/7/1219:
23--%
x=[-2:
0.02:
2];
y=1.1*sign(x).*(abs(x)>
1.1)+x.*(abs(x)<
=1.1);
plot([-2,-1.1,1.1,1.2],[-1.1,-1.1,1.1,1.1])
t=0:
.2:
2*pi;
y=sin(t);
subplot(2,2,1),stairs(t,y)
subplot(2,2,2),stem(t,y)
subplot(2,2,3),bar(t,y)
subplot(2,2,4),semilogx(t,y)
[-10,10])
%--2012/7/1316:
18--%
t:
.12:
x=t.^3.*sin(3*t).*exp(-t);
y=t.^3.*cos(3*t).*exp(-t);
z=t.^2;
plot3(x,y,z),grid
stem3(x,y,z);
[x,y]=meshgrid(-3:
3,-2:
2);
z=(x.^2-2*x).*exp(-x.^2-y.^2-x.*y);
mesh(x,y,z)
surf(x,y,z)
shadingflat
shadinginterp
waterfall(x,y,z)
contour3(x,y,z)
[x,y]=meshgrd(-2:
.1:
[x,y]=meshgrid(-2:
z=1./(sqrt((1-x).^2+y.^2))+1./(sqrt((1+x).^2+y.^2));
surf(x,y,z),shadingflat
xx=[-2:
-1.2,-1.1:
-0.9,-0.8:
0.8,0.9:
1.1,1.2:
yy=[-1:
-0.2,-0.1:
0.1,0.2:
1];
[x,y]=meshgrid(xx,yy);
zlim([0,15])
[x,y]=meshgrid(-1.5:
1.5,-2:
z=0.5457*exp(-0.75*y.^2-3.75*x.^2-1.5*x).*(x+y>
1)0.7575*exp(-y.^2-6*x.^2).*((x+y>
-1)&
(x+y<
=1))+0.5457*exp(-0.75*y.^2-3.75*x.^2+1.5*x).*(x+y<
=-1);
1)+0.7575*exp(-y.^2-6*x.^2).*((x+y>
surf(x,y,z),xlim([-1.51.5]);
view(80,10),xlim([-1.51.5])
1.2);
subplot(224),surf(x,y,z)
subplot(221),surf(x,y,z),view(0,90)
subplot(222),surf(x,y,z),view(90,0)
subplot(223),surf(x,y,z),view(0,0)
W=imread('
baibing-02.jpg'
imtool(W)
W1=rgb2gray(W);
W2=edge(W1)
figure
imtool(~W2)
f=x*(1+a/x)^x*sin(b/x);
%--2012/7/1321:
37--%
limit((exp(x^3)-1)/(1-cos(sqrt(x-sin(x)))),x,0,'
right'
x=-0.1:
0.1;
y=(exp(x.^3)-1)./(1-cos(sqrt(x-sin(x))));
plot(x,y,'
-'
[0],[12],'
o'
limit((exp(x^3)-1)/(1-cos(sqrt(x-sin(x)))),x,0)
f=tan(t);
L1=limit(f,t,pi/2,'
left'
),L2=limit(f,t,pi/2,'
symsxya;
f=exp(-1/(y^2+x^2))*sin(x)^2/x^2*(1+1/y^2)^(x+a^2*y^2);
L=limit(limit(f,x,1/sqrt(y)),y,inf)
f=sin(x)/(x^2+4*x+3);
f1=diff(f)
x1=0:
5;
y=subs(f,x,x1);
y1=subs(f1,x,x1);
ploy(x1,y,x1,y1,'
:
'
plot(x1,y,x1,y1,'
f4=diff(f,x,4)
latex(f4)
tic,diff(f,x,100);
y=sym('
f(t)'
G=simple(diff(t^2*sin(t)*y,t,3))
simple(subs(G,y,exp(-t))),simple(diff(t^2*sin(t)*exp(-t),3)-ans)
%--2012/7/1415:
38--%
%--2012/7/1421:
42--%
F=[(290,290,290)(85,90,100)(85,90,100)(75,80,100)(75,80,95)(75,80,85);
(280,280,280)(50,60,65)(75,80,85)(85,90,100)(65,70,75);
(278,278,278)(50,60,65)(65,70,75)(75,80,85)(85,95,100);
(277,277,277)(85,90,100)(75,80,85)(65,70,75)(85,90,100);
(275,275,275)(75,80,85)(65,70,75)(50,60,65)(85,90,100);
(275,275,275)(50,60,65)(75,80,85)(85,90,100)(75,80,85);
(274,274,274)(85,90,100)(75,80,85)(65,70,75)(75,80,85);
(273,273,273)(75,80,85)(85,90,100)(75,80,85)(65,75,75)]
%--2012/7/1518:
39--%
a=polyfit(t,r,1)