[ET Trac] [Einstein Toolkit] #949: RotatingSymmetry90: abort when evaluating tensor type for Weyl scalars

[Einstein Toolkit]

#949: RotatingSymmetry90: abort when evaluating tensor type for Weyl scalars
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  Reporter:  bmundim                |       Owner:                                 
      Type:  defect                 |      Status:  closed                         
  Priority:  major                  |   Milestone:                                 
 Component:  EinsteinToolkit thorn  |     Version:                                 
Resolution:  invalid                |    Keywords:  RotatingSymmetry90 Weyl scalars
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Comment (by hinder):

 The manual Cartesian parities specify the sign changes of the function
 under ''reflections'' in the planes perpendicular to the axes.  These can
 therefore be used directly by ReflectonSymmetry.  With
 RotatingSymmetry180, the symmetry operation is fortuitously equivalent to
 a reflection in the x direction composed with a reflection in the y
 direction, so if you know how a function transforms under reflections in
 the axes, you can determine how it transforms under the 180 degree
 rotation.  RotatingSymmetry180 contains the logic to apply the parities
 that have been chosen.  However, I don't think that a 90 degree rotation
 can be written as a composition of reflections, so the manual Cartesian
 parities are not useful here.  In any case, RotatingSymmetry90 does not
 take account of these parities.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/949#comment:4>
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