On Monday, 21 October 2019 at 21:09:32 UTC, Peter Jacobs wrote:
On Monday, 21 October 2019 at 20:37:32 UTC, Nicholas Wilson
wrote:
What kind of conditions are you wanting to throw exception on?
infinities, NaNs, ill conditioning, something else?
As always the best way to check is to mark the function of
interest, nothrow take a look at the disassembly and compare
to without nothrow. You may also want to look to the
optimisation summary that I _think_ you can get LDC to
generate.
Our methods take a few short cuts and occasionally step over a
stability boundary, so I guess that it may look like
ill-conditioning.
The reason I asked that is to see what sort of action you take
because there may be better architectures that you can use to
handle that kind of change.
For example, you are integrating with some scheme and hit a
region of high curvature and need to rollback and change scheme
(to either a less coarse time step or better integrator). In
which case it may be best to take a page out of databases and use
a change-commit kind of approach to short circuit through your
calculations and if at the end of your update loop a flag is set
that says this update is invalid then retry with another scheme.
Thank you for the explanation and suggestions.
