SYNOPSIS
 SUBROUTINE ZUPGTR(
 UPLO, N, AP, TAU, Q, LDQ, WORK, INFO )
 CHARACTER UPLO
 INTEGER INFO, LDQ, N
 COMPLEX*16 AP( * ), Q( LDQ, * ), TAU( * ), WORK( * )
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).
ARGUMENTS
 UPLO (input) 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 (input) INTEGER
 The order of the matrix Q. N >= 0.
 AP (input) COMPLEX*16 array, dimension (N*(N+1)/2)
 The vectors which define the elementary reflectors, as returned by ZHPTRD.
 TAU (input) COMPLEX*16 array, dimension (N1)
 TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by ZHPTRD.
 Q (output) COMPLEX*16 array, dimension (LDQ,N)
 The NbyN unitary matrix Q.
 LDQ (input) INTEGER
 The leading dimension of the array Q. LDQ >= max(1,N).
 WORK (workspace) COMPLEX*16 array, dimension (N1)
 INFO (output) INTEGER

= 0: successful exit
< 0: if INFO = i, the ith argument had an illegal value