
zupgtr.f(3) LAPACK zupgtr.f(3)
NAME
zupgtr.f 
SYNOPSIS
Functions/Subroutines
subroutine zupgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)
ZUPGTR
Function/Subroutine Documentation
subroutine zupgtr (characterUPLO, integerN, complex*16, dimension( * )AP, complex*16,
dimension( * )TAU, complex*16, dimension( ldq, * )Q, integerLDQ, complex*16, dimension( *
)WORK, integerINFO)
ZUPGTR
Purpose:
ZUPGTR generates a complex unitary matrix Q which is defined as the
product of n1 elementary reflectors H(i) of order n, as returned by
ZHPTRD using packed storage:
if UPLO = 'U', Q = H(n1) . . . H(2) H(1),
if UPLO = 'L', Q = H(1) H(2) . . . H(n1).
Parameters:
UPLO
UPLO is CHARACTER*1
= 'U': Upper triangular packed storage used in previous
call to ZHPTRD;
= 'L': Lower triangular packed storage used in previous
call to ZHPTRD.
N
N is INTEGER
The order of the matrix Q. N >= 0.
AP
AP is COMPLEX*16 array, dimension (N*(N+1)/2)
The vectors which define the elementary reflectors, as
returned by ZHPTRD.
TAU
TAU is COMPLEX*16 array, dimension (N1)
TAU(i) must contain the scalar factor of the elementary
reflector H(i), as returned by ZHPTRD.
Q
Q is COMPLEX*16 array, dimension (LDQ,N)
The NbyN unitary matrix Q.
LDQ
LDQ is INTEGER
The leading dimension of the array Q. LDQ >= max(1,N).
WORK
WORK is COMPLEX*16 array, dimension (N1)
INFO
INFO is INTEGER
= 0: successful exit
< 0: if INFO = i, the ith argument had an illegal value
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 115 of file zupgtr.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 zupgtr.f(3) 
