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CentOS 7.0 - man page for zlaed0 (centos section 3)

zlaed0.f(3)				      LAPACK				      zlaed0.f(3)

NAME
       zlaed0.f -

SYNOPSIS
   Functions/Subroutines
       subroutine zlaed0 (QSIZ, N, D, E, Q, LDQ, QSTORE, LDQS, RWORK, IWORK, INFO)
	   ZLAED0 used by sstedc. Computes all eigenvalues and corresponding eigenvectors of an
	   unreduced symmetric tridiagonal matrix using the divide and conquer method.

Function/Subroutine Documentation
   subroutine zlaed0 (integerQSIZ, integerN, double precision, dimension( * )D, double precision,
       dimension( * )E, complex*16, dimension( ldq, * )Q, integerLDQ, complex*16, dimension(
       ldqs, * )QSTORE, integerLDQS, double precision, dimension( * )RWORK, integer, dimension( *
       )IWORK, integerINFO)
       ZLAED0 used by sstedc. Computes all eigenvalues and corresponding eigenvectors of an
       unreduced symmetric tridiagonal matrix using the divide and conquer method.

       Purpose:

	    Using the divide and conquer method, ZLAED0 computes all eigenvalues
	    of a symmetric tridiagonal matrix which is one diagonal block of
	    those from reducing a dense or band Hermitian matrix and
	    corresponding eigenvectors of the dense or band matrix.

       Parameters:
	   QSIZ

		     QSIZ is INTEGER
		    The dimension of the unitary matrix used to reduce
		    the full matrix to tridiagonal form.  QSIZ >= N if ICOMPQ = 1.

	   N

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

	   D

		     D is DOUBLE PRECISION array, dimension (N)
		    On entry, the diagonal elements of the tridiagonal matrix.
		    On exit, the eigenvalues in ascending order.

	   E

		     E is DOUBLE PRECISION array, dimension (N-1)
		    On entry, the off-diagonal elements of the tridiagonal matrix.
		    On exit, E has been destroyed.

	   Q

		     Q is COMPLEX*16 array, dimension (LDQ,N)
		    On entry, Q must contain an QSIZ x N matrix whose columns
		    unitarily orthonormal. It is a part of the unitary matrix
		    that reduces the full dense Hermitian matrix to a
		    (reducible) symmetric tridiagonal matrix.

	   LDQ

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

	   IWORK

		     IWORK is INTEGER array,
		    the dimension of IWORK must be at least
				 6 + 6*N + 5*N*lg N
				 ( lg( N ) = smallest integer k
					     such that 2^k >= N )

	   RWORK

		     RWORK is DOUBLE PRECISION array,
					  dimension (1 + 3*N + 2*N*lg N + 3*N**2)
				   ( lg( N ) = smallest integer k
					       such that 2^k >= N )

	   QSTORE

		     QSTORE is COMPLEX*16 array, dimension (LDQS, N)
		    Used to store parts of
		    the eigenvector matrix when the updating matrix multiplies
		    take place.

	   LDQS

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

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit.
		     < 0:  if INFO = -i, the i-th argument had an illegal value.
		     > 0:  The algorithm failed to compute an eigenvalue while
			   working on the submatrix lying in rows and columns
			   INFO/(N+1) through mod(INFO,N+1).

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 145 of file zlaed0.f.

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

Version 3.4.2				 Tue Sep 25 2012			      zlaed0.f(3)


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