Carpet’s HDF5 format outputs a delta attribute that describes the grid spacing for each written chunk. Currently delta is always set to zero for zero-width components, i.e. e.g. for 2d arrays. This confuses post-processing tools.

This pull request passes the actual grid spacing to the writer routine, and writes the correct grid spacing into the attribute.

The pull request is at https://bitbucket.org/eschnett/carpet/pull-requests/46 .

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2546/carpetiohdf5-dont-set-delta-attribute-to