[ET Trac] [Einstein Toolkit] #496: WeylScal4 fails tests with development version of Carpet

[Einstein Toolkit]

#496: WeylScal4 fails tests with development version of Carpet
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 Reporter:  hinder  |       Owner:  eschnett
     Type:  defect  |      Status:  new     
 Priority:  major   |   Milestone:          
Component:  Carpet  |     Version:          
 Keywords:          |  
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 Both WeylScal4 tests fail with the development version of Carpet but not
 with the stable version.  The report is


    Psi4i.d.asc: substantial differences
       significant differences on 16 (out of 62) lines
       maximum absolute difference in column 13 is 0.0042979716483804
       maximum relative difference in column 13 is 0.221177389498685
       (insignificant differences on 20 lines)
    Psi4i.z.asc: substantial differences
       significant differences on 24 (out of 108) lines
       maximum absolute difference in column 13 is 0.0123048458581252
       maximum relative difference in column 13 is 1.43992798290495
       (insignificant differences on 54 lines)
    Psi4r.d.asc: substantial differences
       significant differences on 16 (out of 62) lines
       maximum absolute difference in column 13 is 2.99002416115686e-05
       maximum relative difference in column 13 is 0.995857600242238
       (insignificant differences on 26 lines)
    Psi4r.x.asc: substantial differences
       significant differences on 42 (out of 146) lines
       maximum absolute difference in column 13 is 0.0063512431519604
       maximum relative difference in column 13 is 1.35438090371356
       (insignificant differences on 84 lines)
    Psi4r.y.asc: substantial differences
       significant differences on 42 (out of 146) lines
       maximum absolute difference in column 13 is 0.0064343032695815
       maximum relative difference in column 13 is 1.1458862046889
       (insignificant differences on 84 lines)
    Psi4r.z.asc: substantial differences
       significant differences on 24 (out of 108) lines
       maximum absolute difference in column 13 is 0.00010846878486765
       maximum relative difference in column 13 is 2.89015233246968
       (insignificant differences on 64 lines)

 One possibility is that the grids in this test are so small that the grid
 structure is being affected by the Carpet regridding algorithm which
 ensures proper nesting, and this algorithm might have changed unavoidably
 between the stable and development versions of Carpet.  If we confirm that
 this is the case, we could either use a larger grid to prevent this from
 happening, or just regenerate the data.  It would be useful to add output
 of the coordinate gridfunctions to catch the cases where the grids are a
 different shape.

 (Reporting against Carpet so it can be fixed as part of the move to the
 development version)

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/496>
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