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dlaeda.f(3)				      LAPACK				      dlaeda.f(3)

NAME
       dlaeda.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dlaeda (N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR, GIVCOL, GIVNUM, Q,
	   QPTR, Z, ZTEMP, INFO)
	   DLAEDA used by sstedc. Computes the Z vector determining the rank-one modification of
	   the diagonal matrix. Used when the original matrix is dense.

Function/Subroutine Documentation
   subroutine dlaeda (integerN, integerTLVLS, integerCURLVL, integerCURPBM, integer, dimension( *
       )PRMPTR, integer, dimension( * )PERM, integer, dimension( * )GIVPTR, integer, dimension(
       2, * )GIVCOL, double precision, dimension( 2, * )GIVNUM, double precision, dimension( *
       )Q, integer, dimension( * )QPTR, double precision, dimension( * )Z, double precision,
       dimension( * )ZTEMP, integerINFO)
       DLAEDA used by sstedc. Computes the Z vector determining the rank-one modification of the
       diagonal matrix. Used when the original matrix is dense.

       Purpose:

	    DLAEDA computes the Z vector corresponding to the merge step in the
	    CURLVLth step of the merge process with TLVLS steps for the CURPBMth
	    problem.

       Parameters:
	   N

		     N is INTEGER
		    The dimension of the symmetric tridiagonal matrix.	N >= 0.

	   TLVLS

		     TLVLS is INTEGER
		    The total number of merging levels in the overall divide and
		    conquer tree.

	   CURLVL

		     CURLVL is INTEGER
		    The current level in the overall merge routine,
		    0 <= curlvl <= tlvls.

	   CURPBM

		     CURPBM is INTEGER
		    The current problem in the current level in the overall
		    merge routine (counting from upper left to lower right).

	   PRMPTR

		     PRMPTR is INTEGER array, dimension (N lg N)
		    Contains a list of pointers which indicate where in PERM a
		    level's permutation is stored.  PRMPTR(i+1) - PRMPTR(i)
		    indicates the size of the permutation and incidentally the
		    size of the full, non-deflated problem.

	   PERM

		     PERM is INTEGER array, dimension (N lg N)
		    Contains the permutations (from deflation and sorting) to be
		    applied to each eigenblock.

	   GIVPTR

		     GIVPTR is INTEGER array, dimension (N lg N)
		    Contains a list of pointers which indicate where in GIVCOL a
		    level's Givens rotations are stored.  GIVPTR(i+1) - GIVPTR(i)
		    indicates the number of Givens rotations.

	   GIVCOL

		     GIVCOL is INTEGER array, dimension (2, N lg N)
		    Each pair of numbers indicates a pair of columns to take place
		    in a Givens rotation.

	   GIVNUM

		     GIVNUM is DOUBLE PRECISION array, dimension (2, N lg N)
		    Each number indicates the S value to be used in the
		    corresponding Givens rotation.

	   Q

		     Q is DOUBLE PRECISION array, dimension (N**2)
		    Contains the square eigenblocks from previous levels, the
		    starting positions for blocks are given by QPTR.

	   QPTR

		     QPTR is INTEGER array, dimension (N+2)
		    Contains a list of pointers which indicate where in Q an
		    eigenblock is stored.  SQRT( QPTR(i+1) - QPTR(i) ) indicates
		    the size of the block.

	   Z

		     Z is DOUBLE PRECISION array, dimension (N)
		    On output this vector contains the updating vector (the last
		    row of the first sub-eigenvector matrix and the first row of
		    the second sub-eigenvector matrix).

	   ZTEMP

		     ZTEMP is DOUBLE PRECISION array, dimension (N)

	   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:
	   September 2012

       Contributors:
	   Jeff Rutter, Computer Science Division, University of California at Berkeley, USA

       Definition at line 166 of file dlaeda.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			      dlaeda.f(3)
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