[Users] Exact meaning of prolongation tags

[Roland Haas]

Hello all,

On 2015-10-30 20:00, Erik Schnetter wrote:
> none: Do nothing during synchronization, prolongation, or restriction; the
> respective grid points remain untouched, and if not otherwise defined,
> remain undefined. This is
> commonly used e.g. for integer values that are calculated or determined
> pointwise.
Please note though that current Carpet will not let you actually use
this operator since it caused to much confusion it seems. In SetupGH.cc
line 2455 all requests for "none" are replaced by "sync" (which as Erik
explained is the same but for the fact that doing a SYNC one a GF with
"none" prolongation would not have exchanged ghost zones, but a SYNC on
a "sync" grid function does exchange ghost zone information.

Yours,
Roland

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