zupgtr (3)  Linux Manuals
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.
NN is INTEGER The order of the matrix Q. N >= 0.
APAP is COMPLEX*16 array, dimension (N*(N+1)/2) The vectors which define the elementary reflectors, as returned by ZHPTRD.
TAUTAU is COMPLEX*16 array, dimension (N1) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by ZHPTRD.
QQ is COMPLEX*16 array, dimension (LDQ,N) The NbyN unitary matrix Q.
LDQLDQ is INTEGER The leading dimension of the array Q. LDQ >= max(1,N).
WORKWORK is COMPLEX*16 array, dimension (N1)
INFOINFO 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
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