Query: ssterf
OS: redhat
Section: l
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
SSTERF(l) ) SSTERF(l)NAMESSTERF - compute all eigenvalues of a symmetric tridiagonal matrix using the Pal-Walker-Kahan variant of the QL or QR algorithmSYNOPSISSUBROUTINE SSTERF( N, D, E, INFO ) INTEGER INFO, N REAL D( * ), E( * )PURPOSESSTERF computes all eigenvalues of a symmetric tridiagonal matrix using the Pal-Walker-Kahan variant of the QL or QR algorithm.ARGUMENTSN (input) INTEGER The order of the matrix. N >= 0. D (input/output) 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 (input/output) REAL 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 SSTERF(l)
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