[Developers] CCTK_POSTSTEP

[Erik Schnetter]

On Feb 8, 2008, at 09:15:22, David Rideout wrote:

> I notice that CCTK_POSTSTEP is scheduled at iteration 0, before the
> first CCTK_PRESTEP of iteration 1.  Why is this?  There is no mention
> of this in the documentation, that I could find.  Is this a bug?


Iteration 0 is actually the initial data setup.  It is run after  
setting up the initial data, right before the analysis routines are  
run.  This is intended.  The reason is that certain quantities (e.g.  
the ADM metric) may need to be calculated from the evolved quantities  
(e.g. the BSSN variables), and this also needs to be done after the  
initial data have been set up.

Reading through the documentation, I agree that it is unclear in this  
respect.  The documentation doesn't clearly show the order in which  
the time bins are executed.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/ 
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