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Internal functions used by other MPI functions.
mpi.comm.is.null is used to test if a comm is MPI\_COMM\_NULL (empty members).
mpi.comm.is.null
string create a string (empty space character) buffer.
string
mpi.comm.is.null(comm) string(length)
a communicator number.
length of a string.
string returns an empty character string.
mpi.spawn.Rslaves