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cung2l (3)
  • >> cung2l (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         cung2l - generate an m by n complex matrix Q with  orthonor-
         mal columns,
    
    SYNOPSIS
         SUBROUTINE CUNG2L( M, N, K, A, LDA, TAU, WORK, INFO )
    
         INTEGER INFO, K, LDA, M, N
    
         COMPLEX A( LDA, * ), TAU( * ), WORK( * )
    
    
    
         #include <sunperf.h>
    
         void cung2l(int m, int n, int k, complex *ca, int lda,  com-
                   plex *tau, int *info) ;
    
    PURPOSE
         CUNG2L generates an m by n complex matrix Q with orthonormal
         columns, which is defined as the last n columns of a product
         of k elementary reflectors of order m
    
               Q  =  H(k) . . . H(2) H(1)
    
         as returned by CGEQLF.
    
    
    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. M >=  N  >=
                   0.
    
         K         (input) INTEGER
                   The number of elementary reflectors whose  product
                   defines the matrix Q. N >= K >= 0.
    
         A         (input/output) COMPLEX array, dimension (LDA,N)
                   On entry, the (n-k+i)-th column must  contain  the
                   vector  which  defines  the  elementary  reflector
                   H(i), for i = 1,2,...,k, as returned by CGEQLF  in
                   the  last  k  columns 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 array, dimension (K)
                   TAU(i) must contain the scalar factor of the  ele-
                   mentary reflector H(i), as returned by CGEQLF.
    
         WORK      (workspace) COMPLEX array, dimension (N)
    
         INFO      (output) INTEGER
                   = 0: successful exit
                   < 0: if INFO = -i, the i-th argument has an  ille-
                   gal value
    
    
    
    


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