DSTERF (3)  Linux Manuals
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 PalWalkerKahan variant of the QL or QR algorithm.
Parameters:

N
N is INTEGER The order of the matrix. N >= 0.
DD 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.
EE is DOUBLE PRECISION array, dimension (N1) On entry, the (n1) subdiagonal elements of the tridiagonal matrix. On exit, E has been destroyed.
INFOINFO is INTEGER = 0: successful exit < 0: if INFO = i, the ith 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
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