GNU Scientific Library - Bugs: bug #31109, ode-initval/bsimp is always high...
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bug #31109: ode-initval/bsimp is always high order
Submitter: | -Deleted Account- <bjg> | ||
Submitted: | Thu 23 Sep 2010 01:23:29 PM UTC | ||
Category: | Performance | Severity: | 3 - Normal |
Operating System: | Status: | Confirmed | |
Assigned to: | None | Open/Closed: | Open |
Release: | 1.14 |
No files currently attached
Depends on the following items: None found
Items that depend on this one: None found
Carbon-Copy List
Follows 1 latest change.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2010-09-23 | bjg | Carbon-Copy | - | Added -email is unavailable- |
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Corresponding source code
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
necessary.
Tom Quinn Astronomy, University of Washington
Internet: -email is unavailable-
Phone: 206-685-9009