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Re: Solving system of ODEs backwards in time? [message #94653 is a reply to message #94651]

Fri, 04 August 2017 14:33

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Friday, August 4, 2017 at 4:01:13 PM UTC-4, Barry Lesht wrote:
...
> This seems to work (at least provides answers that agree well with observations) going forward. What I want to do now is start with a known state at time i, and sets of known W vectors and A matrices for times i-1, i-2, ... i-n and find what C(i-n) would have had to be to result in the observed C(i) given that set of W vectors and A matrices.

I'm just saying, LSODE takes a "step" parameter, H, and that parameter can be negative as well as positive. It's just as easy to integrate backward in time as it is to integrate forward in time.

Craig

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[Message index]

		Solving system of ODEs backwards in time? By: BLesht on Sun, 30 July 2017 11:37
		Re: Solving system of ODEs backwards in time? By: Markus Schmassmann on Wed, 02 August 2017 07:58
		Re: Solving system of ODEs backwards in time? By: BLesht on Wed, 02 August 2017 16:50
		Re: Solving system of ODEs backwards in time? By: Craig Markwardt on Fri, 04 August 2017 08:25
		Re: Solving system of ODEs backwards in time? By: BLesht on Fri, 04 August 2017 13:01
		Re: Solving system of ODEs backwards in time? By: Craig Markwardt on Fri, 04 August 2017 14:33

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