
sopgtr.f(3) LAPACK sopgtr.f(3)
NAME
sopgtr.f 
SYNOPSIS
Functions/Subroutines
subroutine sopgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)
SOPGTR
Function/Subroutine Documentation
subroutine sopgtr (characterUPLO, integerN, real, dimension( * )AP, real, dimension( * )TAU,
real, dimension( ldq, * )Q, integerLDQ, real, dimension( * )WORK, integerINFO)
SOPGTR
Purpose:
SOPGTR generates a real orthogonal matrix Q which is defined as the
product of n1 elementary reflectors H(i) of order n, as returned by
SSPTRD using packed storage:
if UPLO = 'U', Q = H(n1) . . . H(2) H(1),
if UPLO = 'L', Q = H(1) H(2) . . . H(n1).
Parameters:
UPLO
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
N is INTEGER
The order of the matrix Q. N >= 0.
AP
AP is REAL array, dimension (N*(N+1)/2)
The vectors which define the elementary reflectors, as
returned by SSPTRD.
TAU
TAU is REAL array, dimension (N1)
TAU(i) must contain the scalar factor of the elementary
reflector H(i), as returned by SSPTRD.
Q
Q is REAL array, dimension (LDQ,N)
The NbyN orthogonal matrix Q.
LDQ
LDQ is INTEGER
The leading dimension of the array Q. LDQ >= max(1,N).
WORK
WORK is REAL array, dimension (N1)
INFO
INFO is INTEGER
= 0: successful exit
< 0: if INFO = i, the ith argument had an illegal value
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 115 of file sopgtr.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 sopgtr.f(3) 
