From: Frank Reininghaus <frank78ac@googlemail.com>
To: "Jochen Küpper" <jochen@fhi-berlin.mpg.de>
Cc: gsl-discuss@sourceware.org
Subject: Re: Bug report and fix for adaptive step size control in ODE solving
Date: Wed, 02 Jan 2008 18:51:00 -0000 [thread overview]
Message-ID: <477BDBEE.2000603@googlemail.com> (raw)
In-Reply-To: <0E55B479-624E-4F88-B511-CDFF93435D9E@fhi-berlin.mpg.de>
Hi Jochen,
Jochen Küpper wrote:
> However, why don't you test what you really describe your comment?
> This would look like the following (untested):
>
> h0 = GSL_MAX_DBL(GSL_DBL_MIN, (t0 != t0+h0) ? h0 : GSL_DBL_EPSILON*t0);
Actually, I had been thinking of something like that first, but then I
was afraid that an optimising compiler might transform 't0 != t0+h0'
into '0 != h0', making the patch useless for the 'h0 <
GSL_DBL_EPSILON*t0' problem.
Regards,
Frank
next prev parent reply other threads:[~2008-01-02 18:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-26 22:14 Frank Reininghaus
2008-01-02 13:40 ` Kevin H. Hobbs
2008-01-02 14:18 ` Jochen Küpper
2008-01-02 18:51 ` Frank Reininghaus [this message]
2008-01-03 9:01 ` Unwanted compiler optimization (was: Bug report and fix for adaptive step size control in ODE solving) Jochen Küpper
2008-01-04 10:44 ` Brian Gough
2008-01-03 5:15 ` Bug report and fix for adaptive step size control in ODE solving Michael Stauffer
2008-01-03 15:54 ` Brian Gough
2008-01-04 9:46 ` Brian Gough
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