# HPL_numroc man page

HPL_numroc — Compute the local number of row/columns.

## Synopsis

**#include "hpl.h"****int HPL_numroc( const int** *N*, **const int** *INB*, **const int** *NB*, **const int** *PROC*, **const int** *SRCPROC*, **const int** *NPROCS* **);**

## Description

**HPL_numroc** returns the local number of matrix rows/columns process PROC will get if we give out N rows/columns starting from global index 0.

## Arguments

- N (input) const int
- On entry, N specifies the number of rows/columns being dealt out. N 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.
- PROC (input) const int
- On entry, PROC specifies the coordinate of the process whose local portion is determined. PROC must be at least zero and strictly less than NPROCS.
- SRCPROC (input) const int
- On entry, SRCPROC specifies the coordinate of the process that possesses the first row or column of the matrix. SRCPROC must be at least zero and strictly less than NPROCS.
- 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_indxg2lp** (3), **HPL_indxg2p** (3), **HPL_indxl2g** (3), **HPL_numrocI** (3).

## Info

October 26, 2012 HPL 2.1 HPL Library Functions