LAPACK
3.4.2
LAPACK: Linear Algebra PACKage
|
Go to the source code of this file.
Functions/Subroutines | |
subroutine | slarf (SIDE, M, N, V, INCV, TAU, C, LDC, WORK) |
SLARF applies an elementary reflector to a general rectangular matrix. |
subroutine slarf | ( | character | SIDE, |
integer | M, | ||
integer | N, | ||
real, dimension( * ) | V, | ||
integer | INCV, | ||
real | TAU, | ||
real, dimension( ldc, * ) | C, | ||
integer | LDC, | ||
real, dimension( * ) | WORK | ||
) |
SLARF applies an elementary reflector to a general rectangular matrix.
Download SLARF + dependencies [TGZ] [ZIP] [TXT]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 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.
[in] | SIDE | SIDE is CHARACTER*1 = 'L': form H * C = 'R': form C * H |
[in] | M | M is INTEGER The number of rows of the matrix C. |
[in] | N | N is INTEGER The number of columns of the matrix C. |
[in] | V | V is REAL 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. |
[in] | INCV | INCV is INTEGER The increment between elements of v. INCV <> 0. |
[in] | TAU | TAU is REAL The value tau in the representation of H. |
[in,out] | 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'. |
[in] | LDC | LDC is INTEGER The leading dimension of the array C. LDC >= max(1,M). |
[out] | WORK | WORK is REAL array, dimension (N) if SIDE = 'L' or (M) if SIDE = 'R' |
Definition at line 125 of file slarf.f.