cupgtr.f man page

cupgtr.f —

Synopsis

Functions/Subroutines

subroutine cupgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)
CUPGTR

Function/Subroutine Documentation

subroutine cupgtr (characterUPLO, integerN, complex, dimension( * )AP, complex, dimension( * )TAU, complex, dimension( ldq, * )Q, integerLDQ, complex, dimension( * )WORK, integerINFO)

CUPGTR

Purpose:

CUPGTR 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
CHPTRD 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 CHPTRD;
= 'L': Lower triangular packed storage used in previous
       call to CHPTRD.

N

N is INTEGER
The order of the matrix Q. N >= 0.

AP

AP is COMPLEX array, dimension (N*(N+1)/2)
The vectors which define the elementary reflectors, as
returned by CHPTRD.

TAU

TAU is COMPLEX array, dimension (N-1)
TAU(i) must contain the scalar factor of the elementary
reflector H(i), as returned by CHPTRD.

Q

Q is COMPLEX 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 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 cupgtr.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

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

Sat Nov 16 2013 Version 3.4.2 LAPACK