Need to use ode45 to solve a problem

2022 1 28
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更新时间：2022 1 28
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I need to use ode 45 to solve the next problem.
The only thing I can't figure out is how to use the function on R(t-T) (T is a constant).
Is there a way to solve it this function?

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回答（1 个）

Torsten
Torsten 2022-1-28

3 个投票

This is a delay differential equation.
You will have to use DDE23 instead of ode45.

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Noam Lusthaus
Noam Lusthaus 2022-1-28
And if T is known and is a constant?
John D'Errico
John D'Errico 2022-1-28
编辑：John D'Errico 2022-1-28
http://scholarpedia.org/article/Delay-differential_equations#:~:text=Delay%20differential%20equations%20differ%20from%20ordinary%20differential%20equations,%28t-%20au_1%29%2C%20y%20%28t-%20au_2%29%2C%5Cldots%2C%20y%20%28t-%20au_k%29%29
Delay differential equations can and often do involve a constant time lag or delay. See the link I show, to note the first example, described in the very first paragraph.
As Torsten said, you will use DDE23.

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