Call Solution as History in DDE23

Question

Gary 2013-4-15

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评论： Sylvia 2015-7-20

Hi there,

I'm trying to solve a system of delayed differential equations using dde23. I want to use the solution from a previous integraton as history of the next integration, but I can only get this to work using sol.y(end):

sol2 = dde23(@Function, [1 2], sol.y(end), [Tstart, Tend]);

which is a single point rather than a function so that the solver is assuming constant history, which is not the case.

Is there a way to call the solution function in as the history rather than just the last point of the previous integration?

Thank you.

Gary

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Sylvia 2015-7-20

I think, but am not sure, that if you specify 'sol' as opposed to 'sol.y(end)' as the history, you will be using the sol function not just its last point. At least when I do this in my dde23 calls, they run successfully and give reasonable values. - Sylvia

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Answer 1

Chin Wan Elijah 2014-8-26

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编辑：Chin Wan Elijah 2014-8-26

I am still trying to get a grip of 'dde23' but I have read some article[Radford University] which says you may use '[S,Sp] = ddeval(sol2,t)' to use the solution found previously, but I have no idea how to use it for what you are asking, hope this help. link to articles: http://www.radford.edu/~thompson/webddes/