clarf.f(3) LAPACK clarf.f(3)NAME
subroutine clarf (SIDE, M, N, V, INCV, TAU, C, LDC, WORK)
CLARF applies an elementary reflector to a general rectangular
subroutine clarf (characterSIDE, integerM, integerN, complex, dimension( *
)V, integerINCV, complexTAU, complex, dimension( ldc, * )C, integerLDC,
complex, dimension( * )WORK)
CLARF applies an elementary reflector to a general rectangular matrix.
CLARF 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
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.
To apply H**H (the conjugate transpose of H), supply conjg(tau) instead
SIDE is CHARACTER*1
= 'L': form H * C
= 'R': form C * H
M is INTEGER
The number of rows of the matrix C.
N is INTEGER
The number of columns of the matrix C.
V is COMPLEX array, dimension
(1 + (M-1)*abs(INCV)) if SIDE = 'L'
or (1 + (N-1)*abs(INCV)) if SIDE = 'R'
The vector v in the representation of H. V is not used if
TAU = 0.
INCV is INTEGER
The increment between elements of v. INCV <> 0.
TAU is COMPLEX
The value tau in the representation of H.
C is COMPLEX 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 is INTEGER
The leading dimension of the array C. LDC >= max(1,M).
WORK is COMPLEX array, dimension
(N) if SIDE = 'L'
or (M) if SIDE = 'R'
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 129 of file clarf.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 clarf.f(3)