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RedHat 9 (Linux i386) - man page for dsterf (redhat section l)

DSTERF(l)						  )						    DSTERF(l)

NAME
DSTERF - compute all eigenvalues of a symmetric tridiagonal matrix using the Pal-Walker-Kahan variant of the QL or QR algorithm
SYNOPSIS
SUBROUTINE DSTERF( N, D, E, INFO ) INTEGER INFO, N DOUBLE PRECISION D( * ), E( * )
PURPOSE
DSTERF computes all eigenvalues of a symmetric tridiagonal matrix using the Pal-Walker-Kahan variant of the QL or QR algorithm.
ARGUMENTS
N (input) INTEGER The order of the matrix. N >= 0. D (input/output) 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 (input/output) DOUBLE PRECISION array, dimension (N-1) On entry, the (n-1) subdiagonal elements of the tridiagonal matrix. On exit, E has been destroyed. INFO (output) 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. LAPACK version 3.0 15 June 2000 DSTERF(l)


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