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### Redistributing a regular matrix to be a gbd matrix.
### Assume gbd.major = 1.
comm.as.gbd <- function(X, balance.method = .pbd_env$SPMD.IO$balance.method,
rank.source = .pbd_env$SPMD.CT$rank.source,
comm = .pbd_env$SPMD.CT$comm){
### Check.
COMM.RANK <- spmd.comm.rank(comm)
ncol.X <- integer(1)
if(COMM.RANK == rank.source){
if(!is.matrix(X)){
stop("X should be a matrix.")
}
ncol.X <- ncol(X)
}
ncol.X <- spmd.bcast.integer(ncol.X, rank.source = rank.source, comm = comm)
### Elimate all others.
if(COMM.RANK != rank.source){
X <- matrix(0, nrow = 0, ncol = ncol.X)
}
### Redistributed.
ret <- comm.load.balance(X, balance.method = balance.method, comm = comm)
ret
} # End of comm.as.gdb().
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