cupgtr.f man page
subroutine cupgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)
subroutine cupgtr (character UPLO, integer N, complex, dimension( * ) AP, complex, dimension( * ) TAU, complex, dimension( ldq, * ) Q, integer LDQ, complex, dimension( * ) WORK, integer INFO)
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
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Definition at line 116 of file cupgtr.f.
Generated automatically by Doxygen for LAPACK from the source code.
The man page cupgtr(3) is an alias of cupgtr.f(3).