zlarfx.f man page

zlarfx.f

Synopsis

Functions/Subroutines

subroutine zlarfx (SIDE, M, N, V, TAU, C, LDC, WORK)
ZLARFX applies an elementary reflector to a general rectangular matrix, with loop unrolling when the reflector has order ≤ 10.

Function/Subroutine Documentation

subroutine zlarfx (character SIDE, integer M, integer N, complex*16, dimension( * ) V, complex*16 TAU, complex*16, dimension( ldc, * ) C, integer LDC, complex*16, dimension( * ) WORK)

ZLARFX applies an elementary reflector to a general rectangular matrix, with loop unrolling when the reflector has order ≤ 10.  

Purpose:

 ZLARFX applies a complex elementary reflector H to a complex m by n
 matrix C, from either the left or the right. H is represented in the
 form

       H = I - tau * v * v**H

 where tau is a complex scalar and v is a complex vector.

 If tau = 0, then H is taken to be the unit matrix

 This version uses inline code if H has order < 11.
Parameters:

SIDE

          SIDE is CHARACTER*1
          = 'L': form  H * C
          = 'R': form  C * H

M

          M is INTEGER
          The number of rows of the matrix C.

N

          N is INTEGER
          The number of columns of the matrix C.

V

          V is COMPLEX*16 array, dimension (M) if SIDE = 'L'
                                        or (N) if SIDE = 'R'
          The vector v in the representation of H.

TAU

          TAU is COMPLEX*16
          The value tau in the representation of H.

C

          C is COMPLEX*16 array, dimension (LDC,N)
          On entry, the m by n matrix C.
          On exit, C is overwritten by the matrix H * C if SIDE = 'L',
          or C * H if SIDE = 'R'.

LDC

          LDC is INTEGER
          The leading dimension of the array C. LDA >= max(1,M).

WORK

          WORK is COMPLEX*16 array, dimension (N) if SIDE = 'L'
                                            or (M) if SIDE = 'R'
          WORK is not referenced if H has order < 11.
Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

December 2016

Definition at line 121 of file zlarfx.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page zlarfx(3) is an alias of zlarfx.f(3).

Tue Nov 14 2017 Version 3.8.0 LAPACK