SRC/zupgtr.f(3)

NAME
SRC/zupgtr.f

SYNOPSIS

  Functions/Subroutines
subroutine zupgtr (uplo, n, ap, tau, q, ldq, work, info)
ZUPGTR

Function/Subroutine Documentation

  subroutine zupgtr (character uplo, integer n, complex*16, dimension( * ) ap, complex*16, dimension( * ) tau, complex*16, dimension( ldq, * ) q, integer ldq, complex*16, dimension( * ) work, integer info)

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.

Definition at line 113 of file zupgtr.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.