[ новости /+++ | форум | теги | ]

NAME
     zunml2 - overwrite the general complex m-by-n matrix C  with
     Q  *  C  if SIDE = 'L' and TRANS = 'N', or   Q'* C if SIDE =
     'L' and TRANS = 'C', or   C * Q if SIDE = 'R'  and  TRANS  =
     'N', or   C * Q' if SIDE = 'R' and TRANS = 'C',

SYNOPSIS
     SUBROUTINE ZUNML2( SIDE, TRANS, M, N, K,  A,  LDA,  TAU,  C,
               LDC, WORK, INFO )

     CHARACTER SIDE, TRANS

     INTEGER INFO, K, LDA, LDC, M, N

     COMPLEX*16 A( LDA, * ), C( LDC, * ), TAU( * ), WORK( * )



     #include <sunperf.h>

     void zunml2(char side, char trans, int  m,  int  n,  int  k,
               doublecomplex  *za,  int  lda, doublecomplex *tau,
               doublecomplex *zc, int ldc, int *info) ;

PURPOSE
     ZUNML2 overwrites the general complex m-by-n matrix C with

     where Q is a complex unitary matrix defined as  the  product
     of k elementary reflectors

           Q = H(k)' . . . H(2)' H(1)'

     as returned by ZGELQF. Q is of order m if SIDE = 'L' and  of
     order n if SIDE = 'R'.


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

     TRANS     (input) CHARACTER*1
               = 'N': apply Q  (No transpose)
               = 'C': apply Q' (Conjugate transpose)

     M         (input) INTEGER
               The number of rows of the matrix C. M >= 0.

     N         (input) INTEGER
               The number of columns of the matrix C. N >= 0.

     K         (input) INTEGER
               The number of elementary reflectors whose  product
               defines the matrix Q.  If SIDE = 'L', M >= K >= 0;
               if SIDE = 'R', N >= K >= 0.

     A         (input) COMPLEX*16 array, dimension
               (LDA,M) if SIDE = 'L', (LDA,N) if SIDE =  'R'  The
               i-th row must contain the vector which defines the
               elementary reflector H(i), for i =  1,2,...,k,  as
               returned  by  ZGELQF  in  the  first k rows of its
               array argument A.  A is modified  by  the  routine
               but restored on exit.

     LDA       (input) INTEGER
               The leading dimension  of  the  array  A.  LDA  >=
               max(1,K).

     TAU       (input) COMPLEX*16 array, dimension (K)
               TAU(i) must contain the scalar factor of the  ele-
               mentary reflector H(i), as returned by ZGELQF.

     C         (input/output) COMPLEX*16 array, dimension (LDC,N)
               On entry, the m-by-n matrix  C.   On  exit,  C  is
               overwritten by Q*C or Q'*C or C*Q' or C*Q.

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

     WORK      (workspace) COMPLEX*16 array, dimension
               (N) if SIDE = 'L', (M) if SIDE = 'R'

     INFO      (output) INTEGER
               = 0: successful exit
               < 0: if INFO = -i, the i-th argument had an  ille-
               gal value

Партнёры:

Хостинг: