mpi.cart.shift {Rmpi}R Documentation

MPI_Cart_shift

Description

mpi.cart.shift shifts the Cartesian topology in both manners, displacement and direction.

Usage

 mpi.cart.shift(comm=3, direction, disp)

Arguments

comm Communicator with Cartesian structure
direction Coordinate dimension of the shift
disp displacement (>0 for upwards or left shift, <0 for downwards or right shift)

Details

mpi.cart.shift provides neighbor ranks from given direction and displacement. The direction argument indicates the dimension of the shift. direction=1 means the first dim, direction=2 means the second dim, etc. disp=1 or -1 provides immediate neighbor ranks and disp=2 or -2 provides neighbor's neighbor ranks. Negative ranks mean out of boundary. They correspond to mpi.proc.null.

Value

mpi.cart.shift returns a vector containing information regarding the rank of the source process and rank of the destination process.

Author(s)

Alek Hunchak and Hao Yu

References

http://www.lam-mpi.org/, http://www-unix.mcs.anl.gov/mpi/www/www3/

See Also

mpi.cart.create,mpi.proc.null


[Package Rmpi version 0.5-2 Index]