# HPL_indxg2lp man page

HPL_indxg2lp — Map a local index into a global one.

## Synopsis

**#include "hpl.h"****void HPL_indxg2lp( int *** *IL*, **int *** *PROC*, **const int** *IG*, **const int** *INB*, **const int** *NB*, **const int** *SRCPROC*, **const int** *NPROCS* **);**

## Description

**HPL_indxg2lp** computes the local index of a matrix entry pointed to by the global index IG as well as the process coordinate which posseses this entry. The local returned index is the same in all processes.

## Arguments

- IL (output) int *
- On exit, IL specifies the local index corresponding to IG. IL is at least zero.
- PROC (output) int *
- On exit, PROC is the coordinate of the process owning the entry specified by the global index IG. PROC is at least zero and less than NPROCS.
- IG (input) const int
- On entry, IG specifies the global index of the matrix entry. IG must be at least zero.
- INB (input) const int
- On entry, INB specifies the size of the first block of the global matrix. INB must be at least one.
- NB (input) const int
- On entry, NB specifies the blocking factor used to partition and distribute the matrix A. NB must be larger than one.
- SRCPROC (input) const int
- On entry, if SRCPROC = -1, the data is not distributed but replicated, in which case this routine returns IG in all processes. Otherwise, the value of SRCPROC is ignored.
- NPROCS (input) const int
- On entry, NPROCS specifies the total number of process rows or columns over which the matrix is distributed. NPROCS must be at least one.

## See Also

**HPL_indxg2l** (3), **HPL_indxg2p** (3), **HPL_indxl2g** (3), **HPL_numroc** (3), **HPL_numrocI** (3).

## Info

October 26, 2012 HPL 2.1 HPL Library Functions