dlarfx (l)  Linux Man Pages
dlarfx: applies a real elementary reflector H to a real m by n matrix C, from either the left or the right
NAME
DLARFX  applies a real elementary reflector H to a real m by n matrix C, from either the left or the rightSYNOPSIS
 SUBROUTINE DLARFX(
 SIDE, M, N, V, TAU, C, LDC, WORK )
 IMPLICIT NONE
 CHARACTER SIDE
 INTEGER LDC, M, N
 DOUBLE PRECISION TAU
 DOUBLE PRECISION C( LDC, * ), V( * ), WORK( * )
PURPOSE
DLARFX applies a real elementary reflector H to a real m by n matrix C, from either the left or the right. H is represented in the formH
where tau is a real scalar and v is a real vector.
If tau = 0, then H is taken to be the unit matrix
This version uses inline code if H has order < 11.
ARGUMENTS
 SIDE (input) CHARACTER*1

= aqLaq: form H * C
= aqRaq: form C * H  M (input) INTEGER
 The number of rows of the matrix C.
 N (input) INTEGER
 The number of columns of the matrix C.
 V (input) DOUBLE PRECISION array, dimension (M) if SIDE = aqLaq
 or (N) if SIDE = aqRaq The vector v in the representation of H.
 TAU (input) DOUBLE PRECISION
 The value tau in the representation of H.
 C (input/output) DOUBLE PRECISION array, dimension (LDC,N)
 On entry, the m by n matrix C. On exit, C is overwritten by the matrix H * C if SIDE = aqLaq, or C * H if SIDE = aqRaq.
 LDC (input) INTEGER
 The leading dimension of the array C. LDA >= (1,M).
 WORK (workspace) DOUBLE PRECISION array, dimension

(N) if SIDE = aqLaq
or (M) if SIDE = aqRaq
WORK is not referenced if H has order < 11.