slarf (l) - Linux Manuals
slarf: applies a real elementary reflector H to a real m by n matrix C, from either the left or the right
NAME
SLARF - applies a real elementary reflector H to a real m by n matrix C, from either the left or the rightSYNOPSIS
- SUBROUTINE SLARF(
- SIDE, M, N, V, INCV, TAU, C, LDC, WORK )
- IMPLICIT NONE
- CHARACTER SIDE
- INTEGER INCV, LDC, M, N
- REAL TAU
- REAL C( LDC, * ), V( * ), WORK( * )
PURPOSE
SLARF 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.
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) REAL array, dimension
- (1 + (M-1)*abs(INCV)) if SIDE = aqLaq or (1 + (N-1)*abs(INCV)) if SIDE = aqRaq The vector v in the representation of H. V is not used if TAU = 0.
- INCV (input) INTEGER
- The increment between elements of v. INCV <> 0.
- TAU (input) REAL
- The value tau in the representation of H.
- C (input/output) 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 = aqLaq, or C * H if SIDE = aqRaq.
- LDC (input) INTEGER
- The leading dimension of the array C. LDC >= max(1,M).
- WORK (workspace) REAL array, dimension
-
(N) if SIDE = aqLaq
or (M) if SIDE = aqRaq