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Lotka-volterra with ode45

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Sam
Sam 2017-12-21
回答： James Tursa 2017-12-21
I have the following system of differential equations:
P' = P − 0.05PR
R' = −0.5R + 0.02PR
My function is the following one:
function xdot = Lotka(t,x)
xdot = [x(1) - 0.05*x(1)*x(2); -0.5*x(2)-0.02*x(1)*x(2)];
To find the solution i use ode45:
[t,x] = ode45(@Lotka, [0 20],[10 10]);
plot(t,x(:,1));
hold on
plot(t,x(:,2));
But Matlab is still running... No error is given... It just keeps running. What went wrong?

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采纳的回答

James Tursa
James Tursa 2017-12-21
Problem may be stiff. Try ode15s instead.

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