zupgtr.f man page
subroutine zupgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)
subroutine zupgtr (characterUPLO, integerN, complex*16, dimension( * )AP, complex*16, dimension( * )TAU, complex*16, dimension( ldq, * )Q, integerLDQ, complex*16, dimension( * )WORK, integerINFO)
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).
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 is INTEGER The order of the matrix Q. N >= 0.
AP is COMPLEX*16 array, dimension (N*(N+1)/2) The vectors which define the elementary reflectors, as returned by ZHPTRD.
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 is COMPLEX*16 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*16 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 zupgtr.f.
Generated automatically by Doxygen for LAPACK from the source code.
zupgtr(3) is an alias of zupgtr.f(3).