Hi, I have a question: If I have an array with negative indices, say defined as A(-5:5) in Fortran. Can I use that for COLLECTIVE CALL, e.g MPI_Bcast, MPI_Gather without transforming to a new array with positive indices? If I have my array defined as A(0:11), I find no issues. Hope you can help me. Thanks and best regards, - Himadri -- Himadri Barman, Research Associate, Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore- 560 064, India. Phone: 91-80-2208-2986 Webpage: http://www.jncasr.ac.in/hbar/