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zunm2r (3)
  • >> zunm2r (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         zunm2r - 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 ZUNM2R( 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 zunm2r(char side, char trans, int  m,  int  n,  int  k,
                   doublecomplex  *za,  int  lda, doublecomplex *tau,
                   doublecomplex *zc, int ldc, int *info) ;
    
    PURPOSE
         ZUNM2R 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(1) H(2) . . . H(k)
    
         as returned by ZGEQRF. 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,K)
                   The i-th column  must  contain  the  vector  which
                   defines  the  elementary  reflector  H(i), for i =
                   1,2,...,k, as returned by ZGEQRF in  the  first  k
                   columns 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.  If  SIDE  =
                   'L',  LDA  >=  max(1,M);  if  SIDE  =  'R', LDA >=
                   max(1,N).
    
         TAU       (input) COMPLEX*16 array, dimension (K)
                   TAU(i) must contain the scalar factor of the  ele-
                   mentary reflector H(i), as returned by ZGEQRF.
    
         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
    
    
    
    


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