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where is the fault the code is not running as it has two delays with four variables?
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function sol = exam4
options = ddeset('Events',@exam4e);
sol = dde23(@exam4f,[1, 10],[5; 0.1; 1],[0, 40],options);
xe = sol.xe;
ye = sol.ye;
ie = sol.ie;
n1 = find(ie == 1);
x1 = xe(n1);
y1 = ye(1,n1);
n2 = find(ie == 2);
x2 = xe(n2);
y2 = ye(2,n2);
n3 = find(ie == 3);
x3 = xe(n3);
y3 = ye(3,n3);
figure
plot(sol.x,sol.y,'k',x1,y1,'rs',x2,y2,'rs',x3,y3,'rs')
title('Infectious disease model from Hairer et alia.')
xlabel('Maxima are indicated by red squares.')
function yp = exam4f(x,y,Z)
ylag1 = Z(:,1);
ylag2 = Z(:,2);
k1 = 2;
k_1 = 1;
k2 = 1;
k3 = 1;
k_3 = 1;
k4 = 2;
k5 = 1;
k6 =1.5;
E1 = 1;
E2 = 2;
yp = [-k1*y(1)*E1+k_1*y(2)+k4*y(3);
k1*y(1)*E1-(k_1+k2)*y(2)-k5*ylag1(1);
k3*y(4)*E2-(k_3+k4)*y(3)-k6*ylag2(2);
k2*y(2)+k_3*y(3)-k3*y(4)*E2+k5*ylag1(1)+k6*ylag2(2)];
function [value,isterminal,direction] = exam4e(x,y,Z)
value = exam4f(x,y,Z,);
isterminal = zeros(3,1);
direction = -ones(3,1);
8 Commenti
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Torsten
il 29 Ago 2022
sol = exam4()
function sol = exam4
options = ddeset('Events',@exam4e);
sol = dde23(@exam4f,[1, 10],[5; 0.1; 1; 7],[0, 40],options);
xe = sol.xe;
ye = sol.ye;
ie = sol.ie;
n1 = find(ie == 1);
x1 = xe(n1);
y1 = ye(1,n1);
n2 = find(ie == 2);
x2 = xe(n2);
y2 = ye(2,n2);
n3 = find(ie == 3);
x3 = xe(n3);
y3 = ye(3,n3);
figure
plot(sol.x,sol.y,'k',x1,y1,'rs',x2,y2,'rs',x3,y3,'rs')
title('Infectious disease model from Hairer et alia.')
xlabel('Maxima are indicated by red squares.')
end
function yp = exam4f(x,y,Z)
ylag1 = Z(:,1);
ylag2 = Z(:,2);
k1 = 2;
k_1 = 1;
k2 = 1;
k3 = 1;
k_3 = 1;
k4 = 2;
k5 = 1;
k6 =1.5;
E1 = 1;
E2 = 2;
yp = [-k1*y(1)*E1+k_1*y(2)+k4*y(3);
k1*y(1)*E1-(k_1+k2)*y(2)-k5*ylag1(1);
k3*y(4)*E2-(k_3+k4)*y(3)-k6*ylag2(2);
k2*y(2)+k_3*y(3)-k3*y(4)*E2+k5*ylag1(1)+k6*ylag2(2)];
end
function [value,isterminal,direction] = exam4e(x,y,Z)
value = exam4f(x,y,Z);
isterminal = zeros(4,1);
direction = -ones(4,1);
end
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