LAPACK
3.4.2
LAPACK: Linear Algebra PACKage

Go to the source code of this file.
Functions/Subroutines  
subroutine  dlarzb (SIDE, TRANS, DIRECT, STOREV, M, N, K, L, V, LDV, T, LDT, C, LDC, WORK, LDWORK) 
DLARZB applies a block reflector or its transpose to a general matrix. 
subroutine dlarzb  (  character  SIDE, 
character  TRANS,  
character  DIRECT,  
character  STOREV,  
integer  M,  
integer  N,  
integer  K,  
integer  L,  
double precision, dimension( ldv, * )  V,  
integer  LDV,  
double precision, dimension( ldt, * )  T,  
integer  LDT,  
double precision, dimension( ldc, * )  C,  
integer  LDC,  
double precision, dimension( ldwork, * )  WORK,  
integer  LDWORK  
) 
DLARZB applies a block reflector or its transpose to a general matrix.
Download DLARZB + dependencies [TGZ] [ZIP] [TXT]DLARZB applies a real block reflector H or its transpose H**T to a real distributed MbyN C from the left or the right. Currently, only STOREV = 'R' and DIRECT = 'B' are supported.
[in]  SIDE  SIDE is CHARACTER*1 = 'L': apply H or H**T from the Left = 'R': apply H or H**T from the Right 
[in]  TRANS  TRANS is CHARACTER*1 = 'N': apply H (No transpose) = 'C': apply H**T (Transpose) 
[in]  DIRECT  DIRECT is CHARACTER*1 Indicates how H is formed from a product of elementary reflectors = 'F': H = H(1) H(2) . . . H(k) (Forward, not supported yet) = 'B': H = H(k) . . . H(2) H(1) (Backward) 
[in]  STOREV  STOREV is CHARACTER*1 Indicates how the vectors which define the elementary reflectors are stored: = 'C': Columnwise (not supported yet) = 'R': Rowwise 
[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]  K  K is INTEGER The order of the matrix T (= the number of elementary reflectors whose product defines the block reflector). 
[in]  L  L is INTEGER The number of columns of the matrix V containing the meaningful part of the Householder reflectors. If SIDE = 'L', M >= L >= 0, if SIDE = 'R', N >= L >= 0. 
[in]  V  V is DOUBLE PRECISION array, dimension (LDV,NV). If STOREV = 'C', NV = K; if STOREV = 'R', NV = L. 
[in]  LDV  LDV is INTEGER The leading dimension of the array V. If STOREV = 'C', LDV >= L; if STOREV = 'R', LDV >= K. 
[in]  T  T is DOUBLE PRECISION array, dimension (LDT,K) The triangular KbyK matrix T in the representation of the block reflector. 
[in]  LDT  LDT is INTEGER The leading dimension of the array T. LDT >= K. 
[in,out]  C  C is DOUBLE PRECISION array, dimension (LDC,N) On entry, the MbyN matrix C. On exit, C is overwritten by H*C or H**T*C or C*H or C*H**T. 
[in]  LDC  LDC is INTEGER The leading dimension of the array C. LDC >= max(1,M). 
[out]  WORK  WORK is DOUBLE PRECISION array, dimension (LDWORK,K) 
[in]  LDWORK  LDWORK is INTEGER The leading dimension of the array WORK. If SIDE = 'L', LDWORK >= max(1,N); if SIDE = 'R', LDWORK >= max(1,M). 
Definition at line 183 of file dlarzb.f.