cupgtr (3)  Linux Manuals
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 n1 elementary reflectors H(i) of order n, as returned by CHPTRD using packed storage: if UPLO = 'U', Q = H(n1) . . . H(2) H(1), if UPLO = 'L', Q = H(1) H(2) . . . H(n1).
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.
NN is INTEGER The order of the matrix Q. N >= 0.
APAP is COMPLEX array, dimension (N*(N+1)/2) The vectors which define the elementary reflectors, as returned by CHPTRD.
TAUTAU is COMPLEX array, dimension (N1) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by CHPTRD.
QQ is COMPLEX array, dimension (LDQ,N) The NbyN unitary matrix Q.
LDQLDQ is INTEGER The leading dimension of the array Q. LDQ >= max(1,N).
WORKWORK is COMPLEX array, dimension (N1)
INFOINFO is INTEGER = 0: successful exit < 0: if INFO = i, the ith 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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