\fBMPI_Cart_rank \fP \- Determines process rank in communicator given Cartesian location.
.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Cart_rank(MPI_Comm \fIcomm\fP, int\fI *coords\fP, int\fI *rank\fP)
.SH Fortran Syntax
.nf
INCLUDE 'mpif.h'
MPI_CART_RANK(\fICOMM, COORDS, RANK, IERROR\fP)
INTEGER \fICOMM, COORDS(*), RANK, IERROR\fP
.SH C++ Syntax
.nf
#include <mpi.h>
int Cartcomm::Get_cart_rank(const int \fIcoords\fP[]) const
.SH INPUT PARAMETERS
.ft R
.TP 1i
comm
Communicator with Cartesian structure (handle).
.TP 1i
coords
Integer array (of size ndims, which was defined by MPI_Cart_create call) specifying the Cartesian coordinates of a process.
.SH OUTPUT PARAMETER
.ft R
.TP 1i
rank
Rank of specified process (integer).
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer).
.SH DESCRIPTION
.ft R
For a process group with Cartesian structure, the function MPI_Cart_rank
translates the logical process coordinates to process ranks as they are used by the point-to-point routines. For dimension i with periods(i) = true, if the coordinate, coords(i), is out of range, that is, coords(i) < 0 or coords(i) >= dims(i), it is shifted back to the interval 0 =< coords(i) < dims(i) automatically. Out-of-range coordinates are erroneous for nonperiodic dimensions.
.SH 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.
.sp
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.
