HPL_dlocmax HPL 2.2 Library Functions February 24, 2016

Name

HPL_dlocmax finds the maximum entry in matrix column.

Synopsis

#include "hpl.h"

void HPL_dlocmax( HPL_T_panel * PANEL, const int N, const int II, const int JJ, double * WORK );

Description

HPL_dlocmax finds the maximum entry in the current column and packs the useful information in WORK[0:3]. On exit, WORK[0] contains the local maximum absolute value scalar, WORK[1] is the corresponding local row index, WORK[2] is the corresponding global row index, and WORK[3] is the coordinate of the process owning this max. When N is less than 1, the WORK[0:2] is initialized to zero, and WORK[3] is set to the total number of process rows.

Arguments

PANEL   (local input/output)          HPL_T_panel *
        On entry,  PANEL  points to the data structure containing the
        panel information.
N       (local input)                 const int
        On entry,  N specifies the local number of rows of the column
        of A on which we operate.
II      (local input)                 const int
        On entry, II  specifies the row offset where the column to be
        operated on starts with respect to the panel.
JJ      (local input)                 const int
        On entry, JJ  specifies the column offset where the column to
        be operated on starts with respect to the panel.
WORK    (local workspace)             double *
        On entry, WORK  is  a workarray of size at least 4.  On exit,
        WORK[0] contains  the  local  maximum  absolute value scalar,
        WORK[1] contains  the corresponding local row index,  WORK[2]
        contains the corresponding global row index, and  WORK[3]  is
        the coordinate of process owning this max.

See Also

HPL_dlocswpN, HPL_dlocswpT, HPL_pdmxswp, HPL_pdpancrN, HPL_pdpancrT, HPL_pdpanllN, HPL_pdpanllT, HPL_pdpanrlN, HPL_pdpanrlT, HPL_pdrpancrN, HPL_pdrpancrT, HPL_pdrpanllN, HPL_pdrpanllT, HPL_pdrpanrlN, HPL_pdrpanrlT, HPL_pdfact.