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MPI_Group_translate_ranks(3OpenMPI)                                      MPI_Group_translate_ranks(3OpenMPI)



NAME
       MPI_Group_translate_ranks - Translates the ranks of processes in one group to those in another group.


SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Group_translate_ranks(MPI_Group group1, int n,
            int *ranks1, MPI_Group group2, int *ranks2)


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GROUP_TRANSLATE_RANKS(GROUP1, N, RANKS1, GROUP2, RANKS2,
                 IERROR)
            INTEGER   GROUP1, N, RANKS1(*), GROUP2, RANKS2(*), IERROR


C++ Syntax
       #include <mpi.h>
       static void Group::Translate_ranks (const Group& group1, int n,
            const int ranks1[], const Group& group2, int ranks2[])


INPUT PARAMETERS
       group1    First group (handle).

       n         Number of ranks in ranks1 and ranks2 arrays (integer).

       ranks1    Array of zero or more valid ranks in group1.

       group2    Second group (handle).


OUTPUT PARAMETERS
       ranks2    Array of corresponding ranks in group2, MPI_UNDEFINED when no correspondence exists.

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       This function is important for determining the relative numbering of the same processes in  two  dif-ferent different
       ferent  groups.  For  instance,  if  one  knows  the  ranks  of  certain  processes  in  the group of
       MPI_COMM_WORLD, one might want to know their ranks in a subset of that group.


ERRORS
       Almost all MPI routines return an error value; C routines as the value of the  function  and  Fortran
       routines  in  the  last argument. C++ functions do not return errors. If the default error handler is
       set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to  throw
       an MPI:Exception object.

       Before  the  error value is returned, the current MPI error handler is called. By default, this error
       handler aborts the MPI job, except for I/O function errors. The error handler  may  be  changed  with
       MPI_Comm_set_errhandler;  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.




Open MPI 1.2                                   September 2006            MPI_Group_translate_ranks(3OpenMPI)