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zungr2 (3)
  • >> zungr2 (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         zungr2 - generate an m by n complex matrix Q with  orthonor-
         mal rows,
    
    SYNOPSIS
         SUBROUTINE ZUNGR2( M, N, K, A, LDA, TAU, WORK, INFO )
    
         INTEGER INFO, K, LDA, M, N
    
         COMPLEX*16 A( LDA, * ), TAU( * ), WORK( * )
    
    
    
         #include <sunperf.h>
    
         void zungr2(int m, int n, int k, doublecomplex *za, int lda,
                   doublecomplex *tau, int *info) ;
    
    PURPOSE
         ZUNGR2 generates an m by n complex matrix Q with orthonormal
         rows,  which is defined as the last m rows of a product of k
         elementary reflectors of order n
    
               Q  =  H(1)' H(2)' . . . H(k)'
    
         as returned by ZGERQF.
    
    
    ARGUMENTS
         M         (input) INTEGER
                   The number of rows of the matrix Q. M >= 0.
    
         N         (input) INTEGER
                   The number of columns of the matrix Q. N >= M.
    
         K         (input) INTEGER
                   The number of elementary reflectors whose  product
                   defines the matrix Q. M >= K >= 0.
    
         A         (input/output) COMPLEX*16 array, dimension (LDA,N)
                   On entry, the (m-k+i)-th row must contain the vec-
                   tor  which  defines the elementary reflector H(i),
                   for i = 1,2,...,k, as returned by  ZGERQF  in  the
                   last k rows of its array argument A.  On exit, the
                   m-by-n matrix Q.
    
         LDA       (input) INTEGER
                   The  first  dimension  of  the  array  A.  LDA  >=
                   max(1,M).
    
         TAU       (input) COMPLEX*16 array, dimension (K)
                   TAU(i) must  contain  the  scalar  factor  of  the
                   elementary reflector H(i), as returned by ZGERQF.
    
         WORK      (workspace) COMPLEX*16 array, dimension (M)
    
         INFO      (output) INTEGER
                   = 0: successful exit
                   < 0: if INFO = -i, the i-th argument has an  ille-
                   gal value
    
    
    
    


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