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