mpi.cart.get provides the user with information on the Cartesian topology
associated with a comm.
Communicator with Cartesian structure
length of vectors dims, periods, and coords in the calling program
The coords are as given for the rank of the calling process as shown.
mpi.cart.get returns a vector containing information on the Cartesian topology
associated with comm. maxdims must be at least ndims as returned by
Alek Hunchak and Hao Yu
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