Scan

void Intracomm.Scan(Object sendbuf, int sendoffset,
                    Object recvbuf, int recvoffset,
                    int count, Datatype datatype,
                    Op op)

sendbuf	send buffer array
sendoffset	initial offset in send buffer
recvbuf	receive buffer array
recvoffset	initial offset in receive buffer
count	number of items in input buffer
datatype	data type of each item in input buffer
op	reduce operation

Perform a prefix reduction on data distributed across the group. Java binding of the MPI operation MPI_SCAN.