ZUNGR2 - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)
NAMEZUNGR2 - generates an m by n complex matrix Q with orthonormal rows,
SYNOPSISSUBROUTINE ZUNGR2(  
M, N, K, A, LDA, TAU, WORK, INFO )  INTEGER INFO, K, LDA, M, N  COMPLEX*16 A( LDA, * ), TAU( * ), WORK( * )
PURPOSEZUNGR2 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.
ARGUMENTSM (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 vector 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 illegal value
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