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dorgl2 (3)
  • >> dorgl2 (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dorgl2 - generate an m by n real matrix Q  with  orthonormal
         rows,
    
    SYNOPSIS
         SUBROUTINE DORGL2( M, N, K, A, LDA, TAU, WORK, INFO )
    
         INTEGER INFO, K, LDA, M, N
    
         DOUBLE PRECISION A( LDA, * ), TAU( * ), WORK( * )
    
    
    
         #include <sunperf.h>
    
         void dorgl2(int m, int n, int k, double *da, int lda, double
                   *tau, int *info) ;
    
    PURPOSE
         DORGL2 generates an m by n real matrix  Q  with  orthonormal
         rows, which is defined as the first m rows of a product of k
         elementary reflectors of order n
    
               Q  =  H(k) . . . H(2) H(1)
    
         as returned by DGELQF.
    
    
    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) DOUBLE PRECISION  array,  dimension
                   (LDA,N)
                   On entry, the i-th row  must  contain  the  vector
                   which defines the elementary reflector H(i), for i
                   = 1,2,...,k, as returned by DGELQF in the first  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) DOUBLE PRECISION array, dimension (K)
                   TAU(i) must contain the scalar factor of the  ele-
                   mentary reflector H(i), as returned by DGELQF.
    
         WORK      (workspace) DOUBLE PRECISION 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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