NAME

       MPI_Type_indexed_c -  Creates an indexed datatype

SYNOPSIS

       int MPI_Type_indexed_c(MPI_Count count, const MPI_Count array_of_blocklengths[],
       const MPI_Count array_of_displacements[], MPI_Datatype oldtype,
       MPI_Datatype *newtype)

INPUT PARAMETERS

       count  -  number  of  blocks  --  also  number  of  entries  in array_of_displacements and
              array_of_blocklengths (non-negative integer) (non-negative integer)
       array_of_blocklengths
              - number of elements per block (non-negative integer) (non-negative integer)
       array_of_displacements
              - displacement for each block, in multiples of oldtype (integer) (integer)
       oldtype
              - old datatype (handle) (handle)

OUTPUT PARAMETERS

       newtype
              - new datatype (handle) (handle)

THREAD AND INTERRUPT SAFETY

       This routine is thread-safe.  This means that this routine may be safely used by  multiple
       threads  without the need for any user-provided thread locks.  However, the routine is not
       interrupt safe.  Typically, this is due to the use of memory allocation routines  such  as
       malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

NOTES FOR FORTRAN

       All  MPI  routines  in  Fortran  (except  for MPI_WTIME and MPI_WTICK ) have an additional
       argument ierr at the end of the argument list.  ierr  is  an  integer  and  has  the  same
       meaning  as  the  return  value  of  the  routine  in  C.   In  Fortran,  MPI routines are
       subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of  type  INTEGER  in  Fortran.   The
       array_of_displacements  are displacements, and are based on a zero origin.  A common error
       is to do something like to following
       integer a(100)
       integer array_of_blocklengths(10), array_of_displacements(10)
       do i=1,10
       array_of_blocklengths(i)   = 1
       10       array_of_displacements(i) = 1 + (i-1)*10
       call MPI_TYPE_INDEXED(10,array_of_blocklengths,array_of_displacements,MPI_INTEGER,newtype,ierr)
       call MPI_TYPE_COMMIT(newtype,ierr)
       call MPI_SEND(a,1,newtype,...)

       expecting this to send "a(1),a(11),..." because  the  array_of_displacements  have  values
       "1,11,...".   Because these are displacements from the beginning of "a", it actually sends
       "a(1+1),a(1+11),...".

       If you wish to consider the displacements as array_of_displacements into a Fortran  array,
       consider declaring the Fortran array with a zero origin
       integer a(0:99)

ERRORS

       All  MPI  routines  (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as
       the value of the function and Fortran routines in the last argument.  Before the value  is
       returned,  the current MPI error handler is called.  By default, this error handler aborts
       the MPI  job.   The  error  handler  may  be  changed  with  MPI_Comm_set_errhandler  (for
       communicators),  MPI_File_set_errhandler  (for files), and MPI_Win_set_errhandler (for RMA
       windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use  is  deprecated.
       The  predefined  error  handler  MPI_ERRORS_RETURN may be used to cause error values to be
       returned.  Note that MPI does not guarantee that an  MPI  program  can  continue  past  an
       error; however, MPI implementations will attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.

       MPI_ERR_ARG
              -  Invalid  argument.  Some argument is invalid and is not identified by a specific
              error class (e.g., MPI_ERR_RANK ).
       MPI_ERR_COUNT
              - Invalid count argument.  Count arguments must be non-negative; a count of zero is
              often valid.
       MPI_ERR_TYPE
              -  Invalid datatype argument.  Additionally, this error can occur if an uncommitted
              MPI_Datatype (see MPI_Type_commit ) is used in a communication call.
       MPI_ERR_OTHER
              - Other error; use MPI_Error_string to get more information about this error code.

                                            2/22/2022                       MPI_Type_indexed_c(3)