table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/slarfx.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/slarfx.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/slarfx.f
SYNOPSIS¶
Functions/Subroutines¶
subroutine SLARFX (side, m, n, v, tau, c, ldc, work)
SLARFX applies an elementary reflector to a general rectangular matrix,
with loop unrolling when the reflector has order ≤ 10.
Function/Subroutine Documentation¶
subroutine SLARFX (character side, integer m, integer n, real, dimension( * ) v, real tau, real, dimension( ldc, * ) c, integer ldc, real, dimension( * ) work)¶
SLARFX applies an elementary reflector to a general rectangular matrix, with loop unrolling when the reflector has order ≤ 10.
Purpose:
!> !> SLARFX 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 !> form !> !> H = I - tau * v * v**T !> !> 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. !>
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 REAL array, dimension (M) if SIDE = 'L' !> or (N) if SIDE = 'R' !> The vector v in the representation of H. !>
TAU
!> TAU is REAL !> The value tau in the representation of H. !>
C
!> C is REAL 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. LDC >= (1,M). !>
WORK
!> WORK is REAL 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.
Definition at line 119 of file slarfx.f.
Author¶
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.12.0 | LAPACK |