mpi.cart.rank translates a Cartesian topology coordinate to its rank.
Communicator with Cartesian structure
Specifies the Cartesian coordinates of a process
For a process group with a Cartesian topology, this function translates the logical
process coordinates to process ranks as they are used by the point-to-point routines.
It is the inverse map of
mpi.cart.rank returns the rank of the specified process.
Alek Hunchak and Hao Yu
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