cupgtr.f(3) LAPACK cupgtr.f(3)
subroutine cupgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)
subroutine cupgtr (characterUPLO, integerN, complex, dimension( * )AP, complex, dimension( *
)TAU, complex, dimension( ldq, * )Q, integerLDQ, complex, dimension( * )WORK, integerINFO)
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).
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 is INTEGER
The order of the matrix Q. N >= 0.
AP is COMPLEX array, dimension (N*(N+1)/2)
The vectors which define the elementary reflectors, as
returned by CHPTRD.
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 is COMPLEX array, dimension (LDQ,N)
The N-by-N unitary matrix Q.
LDQ is INTEGER
The leading dimension of the array Q. LDQ >= max(1,N).
WORK is COMPLEX array, dimension (N-1)
INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 115 of file cupgtr.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 cupgtr.f(3)