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dlarfb examples
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Man Page Details
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NAME
       DLARFB  - a real block reflector H or its transpose H' to a real m by n
       matrix C, from either the left or the right

SYNOPSIS
       SUBROUTINE DLARFB( SIDE, TRANS, DIRECT, STOREV, M, N,  K,  V,  LDV,  T,
                          LDT, C, LDC, WORK, LDWORK )

           CHARACTER      DIRECT, SIDE, STOREV, TRANS

           INTEGER        K, LDC, LDT, LDV, LDWORK, M, N

           DOUBLE         PRECISION  C(  LDC,  *  ), T( LDT, * ), V( LDV, * ),
                          WORK( LDWORK, * )

PURPOSE
       DLARFB applies a real block reflector H or its transpose H' to a real m
       by n matrix C, from either the left or the right.


ARGUMENTS
       SIDE    (input) CHARACTER*1
               = 'L': apply H or H' from the Left
               = 'R': apply H or H' from the Right

       TRANS   (input) CHARACTER*1
               = 'N': apply H (No transpose)
               = 'T': apply H' (Transpose)

       DIRECT  (input) CHARACTER*1
               Indicates  how H is formed from a product of elementary reflec-
               tors = 'F': H = H(1) H(2) . . . H(k) (Forward)
               = 'B': H = H(k) . . . H(2) H(1) (Backward)

       STOREV  (input) CHARACTER*1
               Indicates how the vectors which define the  elementary  reflec-
               tors are stored:
               = 'C': Columnwise
               = 'R': Rowwise

       M       (input) INTEGER
               The number of rows of the matrix C.

       N       (input) INTEGER
               The number of columns of the matrix C.

       K       (input) INTEGER
               The  order  of the matrix T (= the number of elementary reflec-
               tors whose product defines the block reflector).

       V       (input) DOUBLE PRECISION array, dimension
               (LDV,K) if STOREV = 'C' (LDV,M) if STOREV = 'R' and SIDE =  'L'
               (LDV,N)  if  STOREV = 'R' and SIDE = 'R' The matrix V. See fur-
               ther details.

       LDV     (input) INTEGER
               The leading dimension of the array V.  If STOREV = 'C' and SIDE
               =  'L', LDV >= max(1,M); if STOREV = 'C' and SIDE = 'R', LDV >=
               max(1,N); if STOREV = 'R', LDV >= K.

       T       (input) DOUBLE PRECISION array, dimension (LDT,K)
               The triangular k by k matrix T in  the  representation  of  the
               block reflector.

       LDT     (input) INTEGER
               The leading dimension of the array T. LDT >= K.

       C       (input/output) DOUBLE PRECISION array, dimension (LDC,N)
               On  entry,  the  m by n matrix C.  On exit, C is overwritten by
               H*C or H'*C or C*H or C*H'.

       LDC     (input) INTEGER
               The leading dimension of the array C. LDA >= max(1,M).

       WORK    (workspace) DOUBLE PRECISION array, dimension (LDWORK,K)

       LDWORK  (input) INTEGER
               The leading dimension of the array WORK.  If SIDE = 'L', LDWORK
               >= max(1,N); if SIDE = 'R', LDWORK >= max(1,M).

