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

Question

Muyu Zhou 2020-10-16

0
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https://ww2.mathworks.cn/matlabcentral/answers/616568-how-to-use-pplane8-to-plot-some-trajectories-on-a-phase-portrait

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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Answer 1

Prabhan Purwar 2020-10-19

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/616568-how-to-use-pplane8-to-plot-some-trajectories-on-a-phase-portrait#answer_518328

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