ssterf.f(3) LAPACK ssterf.f(3)
subroutine ssterf (N, D, E, INFO)
subroutine ssterf (integerN, real, dimension( * )D, real, dimension( * )E, integerINFO)
SSTERF computes all eigenvalues of a symmetric tridiagonal matrix
using the Pal-Walker-Kahan variant of the QL or QR algorithm.
N is INTEGER
The order of the matrix. N >= 0.
D is REAL array, dimension (N)
On entry, the n diagonal elements of the tridiagonal matrix.
On exit, if INFO = 0, the eigenvalues in ascending order.
E is REAL array, dimension (N-1)
On entry, the (n-1) subdiagonal elements of the tridiagonal
On exit, E has been destroyed.
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.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 87 of file ssterf.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 ssterf.f(3)