LAPACK  3.4.1
LAPACK: Linear Algebra PACKage
zungl2.f File Reference

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Functions/Subroutines

subroutine ZUNGL2 (M, N, K, A, LDA, TAU, WORK, INFO)
 ZUNGL2

Function/Subroutine Documentation

subroutine ZUNGL2 ( INTEGER  M,
INTEGER  N,
INTEGER  K,
COMPLEX*16, dimension( lda, * )  A,
INTEGER  LDA,
COMPLEX*16, dimension( * )  TAU,
COMPLEX*16, dimension( * )  WORK,
INTEGER  INFO 
)

ZUNGL2

Download ZUNGL2 + dependencies [TGZ] [ZIP] [TXT]
Purpose:

 ZUNGL2 generates an m-by-n complex 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 . . . H(2)**H H(1)**H

 as returned by ZGELQF.
 
Parameters:
[in]M
          M is INTEGER
          The number of rows of the matrix Q. M >= 0.
 
[in]N
          N is INTEGER
          The number of columns of the matrix Q. N >= M.
 
[in]K
          K is INTEGER
          The number of elementary reflectors whose product defines the
          matrix Q. M >= K >= 0.
 
[in,out]A
          A is COMPLEX*16 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 ZGELQF in the first k rows of its array argument A.
          On exit, the m by n matrix Q.
 
[in]LDA
          LDA is INTEGER
          The first dimension of the array A. LDA >= max(1,M).
 
[in]TAU
          TAU is COMPLEX*16 array, dimension (K)
          TAU(i) must contain the scalar factor of the elementary
          reflector H(i), as returned by ZGELQF.
 
[out]WORK
          WORK is COMPLEX*16 array, dimension (M)
 
[out]INFO
          INFO is INTEGER
          = 0: successful exit
          < 0: if INFO = -i, the i-th argument has an illegal value
 
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011

Definition at line 114 of file zungl2.f.

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