[ET Trac] [Einstein Toolkit] #666: have CarpetIOScalar output grid scalar directly rather than applying reductions to them

[Einstein Toolkit]

#666: have CarpetIOScalar output grid scalar directly rather than applying
reductions to them
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  Reporter:  rhaas        |       Owner:  eschnett
      Type:  enhancement  |      Status:  review  
  Priority:  minor        |   Milestone:          
 Component:  Carpet       |     Version:          
Resolution:               |    Keywords:          
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Comment (by rhaas):

 Notice that I carefully said that no '''information''' was generated by
 reducing :-). You could always do the norm/abs etc. on the data in the
 output files since there is only a single scalar to consider anyway.
 Anyhow though, not having different behaviour for different object types
 is a valid concern (see below).

 Yes too all the output-format improvement suggestions. I would not say
 that grid arrays cannot have coordinates (the sphericalsurfaces certainly
 could have some), but for grid scalars there simply seem to be no
 coordiantes at all (it's a single number).

 > [How do I classify this as "reject patch; back to discussion"?]
 See #664 :-) Nicely demonstrates the idea behind #664.

 It's funny that you would suggest going for a "fake" reduction. I had
 actually implemented that option first and decided it was too much of a
 hack :-).

 Attached please find my implementation. Note that it only works for grid
 scalars (and maybe one element grid arrays).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/666#comment:3>
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