dsterf.f(3) LAPACK dsterf.f(3)
subroutine dsterf (N, D, E, INFO)
subroutine dsterf (integerN, double precision, dimension( * )D, double precision, dimension( *
DSTERF 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 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 is DOUBLE PRECISION 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 dsterf.f.
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Version 3.4.2 Tue Sep 25 2012 dsterf.f(3)