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Re: [Help-gsl] ode version and compilers

From: Alan Fung
Subject: Re: [Help-gsl] ode version and compilers
Date: Wed, 6 Nov 2013 01:02:57 +0800

I agree that they should be the same.  I have just found that the problem I
have encountered is particular to my simulation program.  Because I have
not putted the time dependent term inside function func.  Sorry about
that.  So, the only thing we want to address is only the performance issue.


2013/11/5 Rhys Ulerich <address@hidden>

> > 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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