dopgtr(l) [redhat man page]

DOPGTR(l)								 )								 DOPGTR(l)

NAME

       DOPGTR  -  generate a real orthogonal matrix Q which is defined as the product of n-1 elementary reflectors H(i) of order n, as returned by
       DSPTRD using packed storage

SYNOPSIS

       SUBROUTINE DOPGTR( UPLO, N, AP, TAU, Q, LDQ, WORK, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDQ, N

	   DOUBLE	  PRECISION AP( * ), Q( LDQ, * ), TAU( * ), WORK( * )

PURPOSE

       DOPGTR 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
       DSPTRD 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).

ARGUMENTS

       UPLO    (input) CHARACTER*1
	       =  'U':	Upper  triangular  packed storage used in previous call to DSPTRD; = 'L': Lower triangular packed storage used in previous
	       call to DSPTRD.

       N       (input) INTEGER
	       The order of the matrix Q. N >= 0.

       AP      (input) DOUBLE PRECISION array, dimension (N*(N+1)/2)
	       The vectors which define the elementary reflectors, as returned by DSPTRD.

       TAU     (input) DOUBLE PRECISION array, dimension (N-1)
	       TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by DSPTRD.

       Q       (output) DOUBLE PRECISION array, dimension (LDQ,N)
	       The N-by-N orthogonal matrix Q.

       LDQ     (input) INTEGER
	       The leading dimension of the array Q. LDQ >= max(1,N).

       WORK    (workspace) DOUBLE PRECISION array, dimension (N-1)

       INFO    (output) INTEGER
	       = 0:  successful exit
	       < 0:  if INFO = -i, the i-th argument had an illegal value

LAPACK version 3.0						   15 June 2000 							 DOPGTR(l)

dopgtr.f(3)							      LAPACK							       dopgtr.f(3)

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 n-1 elementary reflectors H(i) of order n, as returned by
	    DSPTRD 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).

       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.

	   N

		     N is INTEGER
		     The order of the matrix Q. N >= 0.

	   AP

		     AP is DOUBLE PRECISION array, dimension (N*(N+1)/2)
		     The vectors which define the elementary reflectors, as
		     returned by DSPTRD.

	   TAU

		     TAU is DOUBLE PRECISION array, dimension (N-1)
		     TAU(i) must contain the scalar factor of the elementary
		     reflector H(i), as returned by DSPTRD.

	   Q

		     Q is DOUBLE PRECISION array, dimension (LDQ,N)
		     The N-by-N orthogonal matrix Q.

	   LDQ

		     LDQ is INTEGER
		     The leading dimension of the array Q. LDQ >= max(1,N).

	   WORK

		     WORK is DOUBLE PRECISION array, dimension (N-1)

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit
		     < 0:  if INFO = -i, the i-th 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
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       dopgtr.f(3)