How to modify output of an ode?

Question

Simon 2015-9-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/243677-how-to-modify-output-of-an-ode

回答： Steven Lord 2015-9-17

采纳的回答： Steven Lord

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Hello,

my ODE looks like:

function [sol] = ode(t,z)
A = z(1);
B = z(2);
C = z(3);
if t = 0.01
    B=2;
end
dAdz = B;
....

I like to modify my solution z(1) on the time stept t = 0.01. However, in the next step is A = 0 ( A = z(1) in next step) like the hole time before.

Do you know how I can manipulate the solution of the step t+dt?

Thank you

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Answer 1

Steven Lord 2015-9-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/243677-how-to-modify-output-of-an-ode#answer_192816

Solve your ODE up to time t = 0.01. Use the solution at time t = 0.01 to generate a new initial vector for the system of ODEs. Call the ODE solver again with the new initial vector to calculate the solution on the interval from t = 0.01 to your new endpoint.