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HPL_dlocmax(3)               HPL Library Functions              HPL_dlocmax(3)


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 (3), HPL_dlocswpT (3), HPL_pdmxswp (3), HPL_pdpancrN (3),
       HPL_pdpancrT (3), HPL_pdpanllN (3), HPL_pdpanllT (3), HPL_pdpanrlN (3),
       HPL_pdpanrlT (3), HPL_pdrpancrN (3), HPL_pdrpancrT (3),
       HPL_pdrpanllN (3), HPL_pdrpanllT (3), HPL_pdrpanrlN (3),
       HPL_pdrpanrlT (3), HPL_pdfact (3).

HPL 2.1                        October 26, 2012                 HPL_dlocmax(3)

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