LAPACK
3.4.2
LAPACK: Linear Algebra PACKage

Go to the source code of this file.
Functions/Subroutines  
subroutine  dlarz (SIDE, M, N, L, V, INCV, TAU, C, LDC, WORK) 
DLARZ applies an elementary reflector (as returned by stzrzf) to a general matrix. 
subroutine dlarz  (  character  SIDE, 
integer  M,  
integer  N,  
integer  L,  
double precision, dimension( * )  V,  
integer  INCV,  
double precision  TAU,  
double precision, dimension( ldc, * )  C,  
integer  LDC,  
double precision, dimension( * )  WORK  
) 
DLARZ applies an elementary reflector (as returned by stzrzf) to a general matrix.
Download DLARZ + dependencies [TGZ] [ZIP] [TXT]DLARZ applies a real elementary reflector H to a real MbyN 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. H is a product of k elementary reflectors as returned by DTZRZF.
[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]  L  L is INTEGER The number of entries of the vector V containing the meaningful part of the Householder vectors. If SIDE = 'L', M >= L >= 0, if SIDE = 'R', N >= L >= 0. 
[in]  V  V is DOUBLE PRECISION array, dimension (1+(L1)*abs(INCV)) The vector v in the representation of H as returned by DTZRZF. V is not used if TAU = 0. 
[in]  INCV  INCV is INTEGER The increment between elements of v. INCV <> 0. 
[in]  TAU  TAU is DOUBLE PRECISION The value tau in the representation of H. 
[in,out]  C  C is DOUBLE PRECISION array, dimension (LDC,N) On entry, the MbyN 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 DOUBLE PRECISION array, dimension (N) if SIDE = 'L' or (M) if SIDE = 'R' 
Definition at line 146 of file dlarz.f.