zupgtr.f man page

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 n-1 elementary reflectors H(i) of order n, as returned by
ZHPTRD using packed storage:

if UPLO = 'U', Q = H(n-1) . . . H(2) H(1),

if UPLO = 'L', Q = H(1) H(2) . . . H(n-1).

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 (N-1)
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 N-by-N 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 (N-1)

INFO

INFO is INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th 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.

Referenced By

zupgtr(3) is an alias of zupgtr.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK