Derived Datatypes: Indexed

• Array of indices, useful for gather/scatter

• MPI_TYPE_INDEXED (count, blocklens, indices, oldtype, newtype, ierr)

  • IN count Number of blocks to be added
  • IN blocklens Number of elements in each block -- an array of length count
  • IN indices Displacements (an array of length count) for each block
  • IN oldtype Datatype of each element
  • OUT newtype Handle(pointer) for new derived type

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