## Linux and UNIX Man Pages

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Difficulty: Medium
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# dsterf.f(3) [centos man page]

```dsterf.f(3)							      LAPACK							       dsterf.f(3)

NAME
dsterf.f -

SYNOPSIS
Functions/Subroutines
subroutine dsterf (N, D, E, INFO)
DSTERF

Function/Subroutine Documentation
subroutine dsterf (integerN, double precision, dimension( * )D, double precision, dimension( * )E, integerINFO)
DSTERF

Purpose:

DSTERF computes all eigenvalues of a symmetric tridiagonal matrix
using the Pal-Walker-Kahan variant of the QL or QR algorithm.

Parameters:
N

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

D

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

E

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

INFO

INFO is INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value
> 0:  the algorithm failed to find all of the eigenvalues in
a total of 30*N iterations; if INFO = i, then i
elements of E have not converged to zero.

Author:
Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:
November 2011

Definition at line 87 of file dsterf.f.

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

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

## Check Out this Related Man Page

```dsterf.f(3)							      LAPACK							       dsterf.f(3)

NAME
dsterf.f -

SYNOPSIS
Functions/Subroutines
subroutine dsterf (N, D, E, INFO)
DSTERF

Function/Subroutine Documentation
subroutine dsterf (integerN, double precision, dimension( * )D, double precision, dimension( * )E, integerINFO)
DSTERF

Purpose:

DSTERF computes all eigenvalues of a symmetric tridiagonal matrix
using the Pal-Walker-Kahan variant of the QL or QR algorithm.

Parameters:
N

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

D

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

E

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

INFO

INFO is INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value
> 0:  the algorithm failed to find all of the eigenvalues in
a total of 30*N iterations; if INFO = i, then i
elements of E have not converged to zero.

Author:
Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:
November 2011

Definition at line 87 of file dsterf.f.

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

Version 3.4.1							  Sun May 26 2013						       dsterf.f(3)```