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[Bug-gsl] [bug #31109] ode-initval/bsimp is always high order

From: Brian Gough
Subject: [Bug-gsl] [bug #31109] ode-initval/bsimp is always high order
Date: Thu, 23 Sep 2010 13:23:30 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-GB; rv: Gecko/2009061118 Fedora/3.0.11-1.fc9 Firefox/3.0.11


                 Summary:  ode-initval/bsimp is always high order
                 Project: GNU Scientific Library
            Submitted by: bjg
            Submitted on: Thu 23 Sep 2010 02:23:29 PM BST
                Category: Performance
                Severity: 3 - Normal
        Operating System: 
                  Status: Confirmed
             Assigned to: None
             Open/Closed: Open
                 Release: 1.14
         Discussion Lock: Any



The bsimp_alloc() routine uses a very small EPSILON to set the order of
the integrator, and there seems to be no interface to change this.

The result is that even for small steps and large error tolerances, a
minimum of 140 function evaluations are taken per timestep.  For my
application, this is more than an order of magnitude more than are

Tom Quinn       Astronomy, University of Washington
Internet:       address@hidden
Phone:          206-685-9009


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