dopgtr.f (3)  Linux Manuals
NAME
dopgtr.f 
SYNOPSIS
Functions/Subroutines
subroutine dopgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)
DOPGTR
Function/Subroutine Documentation
subroutine dopgtr (characterUPLO, integerN, double precision, dimension( * )AP, double precision, dimension( * )TAU, double precision, dimension( ldq, * )Q, integerLDQ, double precision, dimension( * )WORK, integerINFO)
DOPGTR
Purpose:

DOPGTR generates a real orthogonal matrix Q which is defined as the product of n1 elementary reflectors H(i) of order n, as returned by DSPTRD 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 DSPTRD; = 'L': Lower triangular packed storage used in previous call to DSPTRD.
NN is INTEGER The order of the matrix Q. N >= 0.
APAP is DOUBLE PRECISION array, dimension (N*(N+1)/2) The vectors which define the elementary reflectors, as returned by DSPTRD.
TAUTAU is DOUBLE PRECISION array, dimension (N1) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by DSPTRD.
QQ is DOUBLE PRECISION array, dimension (LDQ,N) The NbyN orthogonal matrix Q.
LDQLDQ is INTEGER The leading dimension of the array Q. LDQ >= max(1,N).
WORKWORK is DOUBLE PRECISION array, dimension (N1)
INFOINFO 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 dopgtr.f.
Author
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