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cupgtr.f(3) LAPACK cupgtr.f(3)

NAME

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

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Tue Sep 25 2012 Version 3.4.2