06-15-2018
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9 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hello, everyone:
i encounter a problem these days , pls help me ,thanks in advance.
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4. Shell Programming and Scripting
We have an egrep search in a while loop.
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5. UNIX for Advanced & Expert Users
Need to make a very fast file existence checker. Passing in 20-50K num of files
In the code below ${file} is a file with a listing of +20,000 files. test_speed is the script. I am commenting out the results of <time test_speed try>.
The normal "test -f" is much much too slow when a system... (2 Replies)
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6. Shell Programming and Scripting
Hey together,
You should know, that I'am relatively new to shell scripting, so my solution is probably a little awkward.
Here is the script:
#!/bin/bash
live_dir=/var/lib/pokerhands/live
for limit in `find $live_dir/ -type d | sed -e s#$live_dir/##`; do
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7. Red Hat
Hi All,
I have RHEL 5.6 with a 70GB local directory of Web content. Images, PHP scripts etc.
I need to copy all this content to an NFS array thats mounted on the RHEL server.
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8. Shell Programming and Scripting
I had written a perl script to compare two files: new and master and get the output of the first file i.e. the first file: words that are not in the master file
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Discussion started by: gimley
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9. Shell Programming and Scripting
Gents,
Please can u help me to improve this script to be more faster, it works perfectly but for big files take a lot time to end the job..
I see the problem is in the step (while) and in this part the script takes a lot time..
Please if you can find a best way to do will be great.
... (13 Replies)
Discussion started by: jiam912
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LEARN ABOUT REDHAT
dlaed4
DLAED4(l) ) DLAED4(l)
NAME
DLAED4 - 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 DLAED4( N, I, D, Z, DELTA, RHO, DLAM, INFO )
INTEGER I, INFO, N
DOUBLE PRECISION DLAM, RHO
DOUBLE PRECISION 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) DOUBLE PRECISION array, dimension (N)
The original eigenvalues. It is assumed that they are in order, D(I) < D(J) for I < J.
Z (input) DOUBLE PRECISION array, dimension (N)
The components of the updating vector.
DELTA (output) DOUBLE PRECISION 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) DOUBLE PRECISION
The scalar in the symmetric updating formula.
DLAM (output) DOUBLE PRECISION
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 DLAED4(l)