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Re: [Help-gsl] ode version and compilers

From: Rhys Ulerich
Subject: Re: [Help-gsl] ode version and compilers
Date: Tue, 5 Nov 2013 09:19:49 -0600

> Also, I found that numerical results by 1.16 and 1.15 are different (less
> than 0.1%).  I doubt it is because of revision 4771.  I have modified the
> source code of 1.16 to undo revision 4771.  And I found that, without 4771,
> results by 1.16 and 1.15 are the same with each other.  So, I question
> whether revision 4771 do a better job or a worse job, in terms of accuracy.

It is possible that something subtle is happening (as I've not traced
through the logic in detail), but I am uncertain how copying the
result of a deterministic calculation is losing accuracy relative to
recomputing it.

- Rhys

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