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

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

Answer 1

[Prabhan Purwar]

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