how to use pplane8 to plot some trajectories on a phase portrait

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Muyu Zhou
Muyu Zhou 2020-10-16
回答： Prabhan Purwar 2020-10-19
i want to use pplane8 to plot some trajectories on a phase portrait from these code
tspan = [0 1]; % start and end times
v0 = 1; w0 = 2; % initial values
IC = [v0 w0];
% Call ode45
[t, vw] = ode45(@fn, tspan,IC);
% Extract individual solution values
v = vw(:,1);
w = vw(:,2);
% Plot results
plot(t,v,'r',t,w,'b'),grid
xlabel('t'),ylabel('v and w')
legend('v','w')
function dvwdt = fn(~,vw)
a = 0.8;
b = 0.7;
g = 0.08;
i = 1.25;
v = vw(1);
w = vw(2);
dvwdt = [v^3/3 - w + i;
g*(v+a-b*w)];
end

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回答（1 个）

Prabhan Purwar
Prabhan Purwar 2020-10-19
Hi,
pplane8 is one of the several submissions in MATLAB File Exchange on MATLAB Central which is a forum for our product users to interact, exchange information and knowledge, without MathWorks' involvement. Feel free to contact the author of this submission directly for specific questions about the implementation.
Thanks

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