Please I need help. How can I plot the Scale-free networks with prey-predator system

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AMA
AMA 2021-5-25
评论： AMA 2021-6-11
How can I plot the Scale-free networks with prey-predator system
I have the system of ODEs
y1' = (2-.5*y2)*y1 +
y2' = (-1+.5*y1)*y2 +
f = @(t,y) [(2-.5*y(2))*y(1); (-1+.5*y(1))*y(2)];
y = [6;2]; t = 0; % given initial value
h = .1; % step size
for i=1:100
plot(t,y(1),'b.',t,y(2),'r.'); hold on % plot rabbits in blue, foxes in red
s = f(t,y); % find slope vector
y = y + h*s; % find new y-vector by using s
t = t + h;
end
hold off
legend('rabbits','foxes')

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回答（1 个）

Manas Meena
Manas Meena 2021-6-3
This example shows how to solve and plot a differential equation representing a predator/prey model
https://www.mathworks.com/help/matlab/math/numerical-integration-of-differential-equations.html#:~:text=Consider%20the%20pair%20of%20first,prey%20and%20predator%20populations%2C%20respectively.
You can also refer to the following file exchange link that plots a phase portrait of the Lotka-Volterra Predator Prey model
https://www.mathworks.com/matlabcentral/fileexchange/46128-lotka-volterra-predator-prey-model

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