11-04-2016
10 More Discussions You Might Find Interesting
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Hi,
I have the following question :
As far as I know unix doesn't store file creation dates.
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tar -cvzf backup.tar --newer-mtime ? (1 Reply)
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Is there a way to use the find command to locate files newer than a specific date?
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--Alex (4 Replies)
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10. Shell Programming and Scripting
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Discussion started by: drew77
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LEARN ABOUT REDHAT
slaed4
SLAED4(l) ) SLAED4(l)
NAME
SLAED4 - subroutine computes the I-th updated eigenvalue of a symmetric rank-one modification to a diagonal matrix whose elements are given
in the array d, and that D(i) < D(j) for i < j and that RHO > 0
SYNOPSIS
SUBROUTINE SLAED4( N, I, D, Z, DELTA, RHO, DLAM, INFO )
INTEGER I, INFO, N
REAL DLAM, RHO
REAL D( * ), DELTA( * ), Z( * )
PURPOSE
This subroutine computes the I-th updated eigenvalue of a symmetric rank-one modification to a diagonal matrix whose elements are given in
the array d, and that D(i) < D(j) for i < j and that RHO > 0. This is arranged by the calling routine, and is no loss in generality. The
rank-one modified system is thus
diag( D ) + RHO * Z * Z_transpose.
where we assume the Euclidean norm of Z is 1.
The method consists of approximating the rational functions in the secular equation by simpler interpolating rational functions.
ARGUMENTS
N (input) INTEGER
The length of all arrays.
I (input) INTEGER
The index of the eigenvalue to be computed. 1 <= I <= N.
D (input) REAL array, dimension (N)
The original eigenvalues. It is assumed that they are in order, D(I) < D(J) for I < J.
Z (input) REAL array, dimension (N)
The components of the updating vector.
DELTA (output) REAL array, dimension (N)
If N .ne. 1, DELTA contains (D(j) - lambda_I) in its j-th component. If N = 1, then DELTA(1) = 1. The vector DELTA contains the
information necessary to construct the eigenvectors.
RHO (input) REAL
The scalar in the symmetric updating formula.
DLAM (output) REAL
The computed lambda_I, the I-th updated eigenvalue.
INFO (output) INTEGER
= 0: successful exit
> 0: if INFO = 1, the updating process failed.
PARAMETERS
Logical variable ORGATI (origin-at-i?) is used for distinguishing whether D(i) or D(i+1) is treated as the origin.
ORGATI = .true. origin at i ORGATI = .false. origin at i+1
Logical variable SWTCH3 (switch-for-3-poles?) is for noting if we are working with THREE poles!
MAXIT is the maximum number of iterations allowed for each eigenvalue.
Further Details ===============
Based on contributions by Ren-Cang Li, Computer Science Division, University of California at Berkeley, USA
LAPACK version 3.0 15 June 2000 SLAED4(l)