sopgtr.f(3) LAPACK sopgtr.f(3)
subroutine sopgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)
subroutine sopgtr (characterUPLO, integerN, real, dimension( * )AP, real, dimension( * )TAU,
real, dimension( ldq, * )Q, integerLDQ, real, dimension( * )WORK, integerINFO)
SOPGTR generates a real orthogonal matrix Q which is defined as the
product of n-1 elementary reflectors H(i) of order n, as returned by
SSPTRD 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 SSPTRD;
= 'L': Lower triangular packed storage used in previous
call to SSPTRD.
N is INTEGER
The order of the matrix Q. N >= 0.
AP is REAL array, dimension (N*(N+1)/2)
The vectors which define the elementary reflectors, as
returned by SSPTRD.
TAU is REAL array, dimension (N-1)
TAU(i) must contain the scalar factor of the elementary
reflector H(i), as returned by SSPTRD.
Q is REAL array, dimension (LDQ,N)
The N-by-N orthogonal matrix Q.
LDQ is INTEGER
The leading dimension of the array Q. LDQ >= max(1,N).
WORK is REAL 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 sopgtr.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 sopgtr.f(3)