redhat man page for slasq1

Query: slasq1

OS: redhat

Section: l

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

SLASQ1(l)								 )								 SLASQ1(l)

NAME
SLASQ1 - compute the singular values of a real N-by-N bidiagonal matrix with diagonal D and off-diagonal E
SYNOPSIS
SUBROUTINE SLASQ1( N, D, E, WORK, INFO ) INTEGER INFO, N REAL D( * ), E( * ), WORK( * )
PURPOSE
SLASQ1 computes the singular values of a real N-by-N bidiagonal matrix with diagonal D and off-diagonal E. The singular values are computed to high relative accuracy, in the absence of denormalization, underflow and overflow. The algorithm was first presented in "Accurate singular values and differential qd algorithms" by K. V. Fernando and B. N. Parlett, Numer. Math., Vol-67, No. 2, pp. 191-230, 1994, and the present implementation is described in "An implementation of the dqds Algorithm (Positive Case)", LAPACK Working Note.
ARGUMENTS
N (input) INTEGER The number of rows and columns in the matrix. N >= 0. D (input/output) REAL array, dimension (N) On entry, D contains the diagonal elements of the bidiagonal matrix whose SVD is desired. On normal exit, D contains the singular values in decreasing order. E (input/output) REAL array, dimension (N) On entry, elements E(1:N-1) contain the off-diagonal elements of the bidiagonal matrix whose SVD is desired. On exit, E is overwrit- ten. WORK (workspace) REAL array, dimension (4*N) INFO (output) INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value > 0: the algorithm failed = 1, a split was marked by a positive value in E = 2, current block of Z not diagonalized after 30*N itera- tions (in inner while loop) = 3, termination criterion of outer while loop not met (program created more than N unreduced blocks) LAPACK version 3.0 15 June 2000 SLASQ1(l)
Related Man Pages
cbdsqr(l) - redhat
slasq1(l) - redhat
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dlasq1.f(3) - centos
slasq1.f(3) - centos
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