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³ÌÐòÎÒ·ÂÕÕд³öÀ´ÁË¡¡¡¡ÓõÄÊÇ2010ÄêÊý¾Ý¡¡¡¡ÓÃfminconÓÅ»¯£¨ÎÄÕÂÖÐÓÃfminsearch,µ«ÊÇÎÒ²»ÖªµÀÓÃÕâ¸ö¸ÃÔõô¼ÓlbºÍub£©¡¡µ«ÊǹÀ¼ÆµÄ£ë¸úÎÄÕÂÖУ²£°£±£°ÄêÏà²îºÜ´ó
k0 = [0.5 0.5 0.5 0.5 0.5 0.5]; % ²ÎÊý³õÖµÎÒÊÇÔÚlbºÍub·¶Î§ÄÚËæ±ãÑ¡µÄ,ÊDz»ÊÇ»á¶Ô½á¹ûÓкܴóÓ°Ï죿
ÎÄÕÂÖÐE (0) in [1.8 ¡Á 104,1.4 ¡Á 107] I(0) in [1.8 ¡Á 103,1.8 ¡Á 105], µ«ÊÇÎÒ²»ÖªµÀÔõô½«£ùµÄ³õÖµÉè³ÉÒ»¸ö·¶Î§£¬ÓÚÊÇÓÃ2.043*10^4ºÍ 1.8001*10^3´úÌæÁË£¬ÓÐʲô°ì·¨¿ÉÒÔ¸ÄÒ»ÏÂÂð
%6¸ö²ÎÊý ÔËÐв»±¨´í µ«ÊDzÎÊýÖµºÍÎÄÕÂÏà²îºÜ´ó ½á¹ûÄâºÏÒ²²»ºÃ
%function k1k2k3
format long
clear all
clc
tspan = [1:12];
k0 = [0.5 0.5 0.5 0.5 0.5 0.5]; % ²ÎÊý³õÖµ
lb = [0.0001 0.0001 0.0001 0.1 0.01 0.1]; % ²ÎÊýÏÂÏÞ
ub = [50 1 1 1 1 1]; % ²ÎÊýÉÏÏÞ
x0 = [1.4*10^8 2.043*10^4 1.8001*10^3 1212 0]; %y³õÖµ
ExpData=[
1 3756.7
2 2386.2
3 7775.6
4 24860.9
5 35434.7
6 34310
7 26126.3
8 11909.6
9 10165.4
10 8761.2
11 7959.1
12 6087.9
];
t=ExpData(:,1);
yexp = ExpData(:,2); % yexp: CDCÊý¾Ý
% ʹÓú¯Êýfmincon()½øÐвÎÊý¹À¼Æ
[k,fval,flag] = fmincon(@MSS,k0,[],[],[],[],lb,ub,[],[],x0,yexp);
fprintf('\nʹÓú¯Êýfmincon()¹À¼ÆµÃµ½µÄ²ÎÊýֵΪ:\n')
fprintf('\tk1 = %.4f\n',k(1))
fprintf('\tk2 = %.4f\n',k(2))
fprintf('\tk3 = %.4f\n',k(3))
fprintf('\tk4 = %.4f\n',k(4))
fprintf('\tk5 = %.4f\n',k(5))
fprintf('\tk6 = %.4f\n',k(6))
fprintf(' The sum of the squares is: %.1e\n\n',fval)
%% =======»æͼÏÔʾ½á¹û=======
[tt xx] = ode45(@li,tspan,x0,[],k);
plot(t,yexp(:,1),'r.-')
hold on
plot(tt,xx(:,4),'ro-')
legend('exp y1', 'pre y1')
xlabel('t/ÔÂ')
ylabel('ÈËÊý')
function f = MSS(k,x0,yexp) % fmincon£¨£©
tspan = [1:12];
[t x] = ode45(@li,tspan,x0,[],k);
y(:,1) = x(:,4);
f = sum((log2(1+ yexp(:,1))-log2(1+ y(:,1))).^2);
%΢·Ö·½³Ì×é
function dydt=li(t,y,k)
u=3.9139*10^-5;
dydt=[(u*(y(1)+y(2)+y(3)+y(4)+y(5))-k(1)*(y(3)+y(4))*y(1)/(y(1)+y(2)+y(3)+y(4)+y(5))+k(2)*y(5)-u*y(1))
(k(1)*(y(3)+y(4))*y(1)/(y(1)+y(2)+y(3)+y(4)+y(5))-k(3)*y(2)-u*y(2))
(k(3)*(1-k(5))*y(2)-k(4)*y(3)-u*y(3))
(k(3)*k(5)*y(2)-k(6)*y(4)-u*y(4))
(k(4)*y(3)+k(6)*y(4)-k(2)*y(5)-u*y(5))];
ʹÓú¯Êýfmincon()¹À¼ÆµÃµ½µÄ²ÎÊýֵΪ:
k1 = 0.0001
k2 = 0.3354
k3 = 0.4065
k4 = 0.8597
k5 = 1.0000
k6 = 0.1000
The sum of the squares is: 1.2e+01 |
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