ODE23/45 for 2-dimensional solution and alternatives?

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Chien-Chia Huang 2014-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/114052-ode23-45-for-2-dimensional-solution-and-alternatives

评论： Chien-Chia Huang 2014-1-29

Hello there,

Per the help document for ODE23/45, there is no way to get a 2-element solution even if I input tspan which has only 2 points (my tspan is like 1+1/500:1/500:1+2/500). So my question is if

1. I can enforce ODE solvers to yield such solutions or

2. is there any alternative ODE routine that I can use to get my things working?

Thanks!

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Chien-Chia Huang 2014-1-29

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The problem can be resolved by using the information T.

Let's say we have [T,Y] = ode45(myode,tspan,y0) and tspan has only two elements, e.g. tspan = [a,b]. Then, to get a 2-dimensional solution for ODE23/45, we write

Y = Y(abs(T-a)<0.0001 | abs(T-b)<0.0001)

which would result in a 2-dimensional solution as desired.

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