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Man Pages


Manual Reference Pages  -  ZLAREF (l)

NAME

ZLAREF - applie one or several Householder reflectors of size 3 to one or two matrices (if column is specified) on either their rows or columns

CONTENTS

Synopsis
Purpose
Arguments
Further Details

SYNOPSIS

SUBROUTINE ZLAREF( TYPE, A, LDA, WANTZ, Z, LDZ, BLOCK, IROW1, ICOL1, ISTART, ISTOP, ITMP1, ITMP2, LILOZ, LIHIZ, VECS, V2, V3, T1, T2, T3 )
    LOGICAL BLOCK, WANTZ
    CHARACTER TYPE
    INTEGER ICOL1, IROW1, ISTART, ISTOP, ITMP1, ITMP2, LDA, LDZ, LIHIZ, LILOZ
    COMPLEX*16 T1, T2, T3, V2, V3
    COMPLEX*16 A( LDA, * ), VECS( * ), Z( LDZ, * )

PURPOSE

ZLAREF applies one or several Householder reflectors of size 3 to one or two matrices (if column is specified) on either their rows or columns.

ARGUMENTS

TYPE (global input) CHARACTER*1
  If ’R’: Apply reflectors to the rows of the matrix (apply from left) Otherwise: Apply reflectors to the columns of the matrix Unchanged on exit.
A (global input/output) COMPLEX*16 array, (LDA,*)
  On entry, the matrix to receive the reflections. The updated matrix on exit.
LDA (local input) INTEGER
  On entry, the leading dimension of A. Unchanged on exit.
WANTZ (global input) LOGICAL
  If .TRUE., then apply any column reflections to Z as well. If .FALSE., then do no additional work on Z.
Z (global input/output) COMPLEX*16 array, (LDZ,*)
  On entry, the second matrix to receive column reflections. This is changed only if WANTZ is set.
LDZ (local input) INTEGER
  On entry, the leading dimension of Z. Unchanged on exit.
BLOCK (global input) LOGICAL
  If .TRUE., then apply several reflectors at once and read their data from the VECS array. If .FALSE., apply the single reflector given by V2, V3, T1, T2, and T3.
IROW1 (local input/output) INTEGER
  On entry, the local row element of A. Undefined on output.
ICOL1 (local input/output) INTEGER
  On entry, the local column element of A. Undefined on output.
ISTART (global input) INTEGER
  Specifies the "number" of the first reflector. This is used as an index into VECS if BLOCK is set. ISTART is ignored if BLOCK is .FALSE..
ISTOP (global input) INTEGER
  Specifies the "number" of the last reflector. This is used as an index into VECS if BLOCK is set. ISTOP is ignored if BLOCK is .FALSE..
ITMP1 (local input) INTEGER
  Starting range into A. For rows, this is the local first column. For columns, this is the local first row.
ITMP2 (local input) INTEGER
  Ending range into A. For rows, this is the local last column. For columns, this is the local last row.

LILOZ LIHIZ (local input) INTEGER These serve the same purpose as ITMP1,ITMP2 but for Z when WANTZ is set.

VECS (global input) COMPLEX*16 array of size 3*N (matrix size)
  This holds the size 3 reflectors one after another and this is only accessed when BLOCK is .TRUE.

V2 V3 T1 T2 T3 (global input/output) COMPLEX*16 This holds information on a single size 3 Householder reflector and is read when BLOCK is .FALSE., and overwritten when BLOCK is .TRUE.

FURTHER DETAILS

Implemented by: M. Fahey, May 28, 1999

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ScaLAPACK version 1.7 ZLAREF (l) 13 August 2001

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