Comment (by Roland Haas):

Instead of just offering a signle type of reduction (historgram) it might be nicer (and not more work) to allow users to supply a custom “kernel” that is being called for each grid point by CarpetReduce. Something like:

int callback(cGH* cctkGH, CCTK_INT idx, CCTK_REAL data, void *calldata)

or so which would let users implement their own histogram or other reductions, eg. a maximum location reduction.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2542/support-for-creating-and-saving-1d