csteqr.f man page on Oracle

```csteqr.f(3)			    LAPACK			   csteqr.f(3)

NAME
csteqr.f -

SYNOPSIS
Functions/Subroutines
subroutine csteqr (COMPZ, N, D, E, Z, LDZ, WORK, INFO)
CSTEQR

Function/Subroutine Documentation
subroutine csteqr (characterCOMPZ, integerN, real, dimension( * )D, real,
dimension( * )E, complex, dimension( ldz, * )Z, integerLDZ, real,
dimension( * )WORK, integerINFO)
CSTEQR

Purpose:

CSTEQR computes all eigenvalues and, optionally, eigenvectors of a
symmetric tridiagonal matrix using the implicit QL or QR method.
The eigenvectors of a full or band complex Hermitian matrix can also
be found if CHETRD or CHPTRD or CHBTRD has been used to reduce this
matrix to tridiagonal form.

Parameters:
COMPZ

COMPZ is CHARACTER*1
= 'N':  Compute eigenvalues only.
= 'V':  Compute eigenvalues and eigenvectors of the original
Hermitian matrix.	On entry, Z must contain the
unitary matrix used to reduce the original matrix
to tridiagonal form.
= 'I':  Compute eigenvalues and eigenvectors of the
tridiagonal matrix.  Z is initialized to the identity
matrix.

N

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

D

D is REAL array, dimension (N)
On entry, the diagonal elements of the tridiagonal matrix.
On exit, if INFO = 0, the eigenvalues in ascending order.

E

E is REAL array, dimension (N-1)
On entry, the (n-1) subdiagonal elements of the tridiagonal
matrix.
On exit, E has been destroyed.

Z

Z is COMPLEX array, dimension (LDZ, N)
On entry, if  COMPZ = 'V', then Z contains the unitary
matrix used in the reduction to tridiagonal form.
On exit, if INFO = 0, then if COMPZ = 'V', Z contains the
orthonormal eigenvectors of the original Hermitian matrix,
and if COMPZ = 'I', Z contains the orthonormal eigenvectors
of the symmetric tridiagonal matrix.
If COMPZ = 'N', then Z is not referenced.

LDZ

LDZ is INTEGER
The leading dimension of the array Z.  LDZ >= 1, and if
eigenvectors are desired, then  LDZ >= max(1,N).

WORK

WORK is REAL array, dimension (max(1,2*N-2))
If COMPZ = 'N', then WORK is not referenced.

INFO

INFO is INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value
> 0:  the algorithm has failed to find all the eigenvalues in
a total of 30*N iterations; if INFO = i, then i
elements of E have not converged to zero; on exit, D
and E contain the elements of a symmetric tridiagonal
matrix which is unitarily similar to the original
matrix.

Author:
Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:
November 2011

Definition at line 133 of file csteqr.f.

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

Version 3.4.2			Tue Sep 25 2012			   csteqr.f(3)
```
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