[ET Trac] [Einstein Toolkit] #1554: Want to define constants in parameter files

[Einstein Toolkit]

#1554: Want to define constants in parameter files
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  Reporter:  eschnett     |       Owner:  sbrandt            
      Type:  enhancement  |      Status:  assigned           
  Priority:  major        |   Milestone:                     
 Component:  Cactus       |     Version:  development version
Resolution:               |    Keywords:                     
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Comment (by hinder):

 Another option would be to improve the Cactus parameters themselves so
 that this became easier.  For example, you could specify a time interval
 between outputs, rather than the resolution-dependent iteration number.
 The time step could be specified as a fraction of a space step, as a
 Courant factor.  With multipatch this is ambiguous, but there is probably
 a way around that.  Alternatively, there could be a global "resolution
 scaling factor" which automatically rescaled certain quantities for
 convergence testing.

 I don't think the overhead of an rpar file is so much.  See
 http://simfactory.org/info/documentation/userguide/use.html#parameter-
 file-scripts for an example; it's an additional 8 lines, which is very
 small in comparison to a typical parameter file.  It also doesn't change
 from one parameter file to the next.  And is quoting every $ sign by
 repeating it so onerous?  Is there anything other than $parfile which
 needs to be quoted?  And then you get the benefit of a complete
 programming language if you need it, and the parameter file as Cactus sees
 it is still easy to parse by other programs.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1554#comment:7>
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