6 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi
I run the command "x" and the output looks like this
a;b;c;d;e;f;g;h;i;j;k;l;
but how can i get the output as below
a
b
c
d
e
f
g
h
pleae help me in this... (4 Replies)
Discussion started by: kumar85shiv
4 Replies
2. UNIX for Dummies Questions & Answers
Hi All,
I have a large text file which is a combination of multiple files. This is what I used and it worked.
for i in /home/docs/text/*
do
cat $i >> Single_File
done
Now wondering, if there is a way to sort that single large file based on timestamps in ascending order. Text file... (11 Replies)
Discussion started by: prrampalli
11 Replies
3. UNIX for Dummies Questions & Answers
Hello, I'm trying to delete duplicates when there are more than 10 duplicates, based on the value of the first column.
e.g.
a 1
a 2
a 3
b 1
c 1
gives
b 1
c 1
but requires 11 duplicates before it deletes.
Thanks for the help
Video tutorial on how to use code tags in The UNIX... (11 Replies)
Discussion started by: informaticist
11 Replies
4. Shell Programming and Scripting
Hello,
I am new to shell scripting. I have a huge file with multiple columns for example:
I have 5 columns below.
HWUSI-EAS000_29:1:105 + chr5 76654650 AATTGGAA HHHHG
HWUSI-EAS000_29:1:106 + chr5 76654650 AATTGGAA B@HYL
HWUSI-EAS000_29:1:108 + ... (4 Replies)
Discussion started by: Diya123
4 Replies
5. Shell Programming and Scripting
I am a newbie to shell scripting ..
I have a .csv file. It has 1000 some rows and about 7 columns...
but before I insert this data to a table I have to parse it and clean it ..basing on the value of the first column..which a string of phone number type...
example below..
column 1 ... (2 Replies)
Discussion started by: mitr
2 Replies
6. HP-UX
Error received when I tried to restore a blank disk with an 'auto recovery' DDS tape via HP-UX recovery system 2.0 onto a 1Gb SCSI. I assumed it would do the setup, wrong. Could someone tell me the procedure to initial disk for recovering files using cpio. The system is a HP-UX 9.04 version on a... (1 Reply)
Discussion started by: admin wanabee
1 Replies
pcg(4rheolef) rheolef-6.1 pcg(4rheolef)
NAME
pcg -- conjugate gradient algorithm.
SYNOPSIS
template <class Matrix, class Vector, class Preconditioner, class Real>
int pcg (const Matrix &A, Vector &x, const Vector &b,
const Preconditioner &M, int &max_iter, Real &tol, odiststream *p_derr=0);
EXAMPLE
The simplest call to 'pcg' has the folling form:
size_t max_iter = 100;
double tol = 1e-7;
int status = pcg(a, x, b, EYE, max_iter, tol, &derr);
DESCRIPTION
pcg solves the symmetric positive definite linear system Ax=b using the Conjugate Gradient method.
The return value indicates convergence within max_iter (input) iterations(0), or no convergence within max_iter iterations(1). Upon suc-
cessful return, output arguments have the following values:
x approximate solution to Ax = b
max_iter
the number of iterations performed before the tolerance was reached
tol the residual after the final iteration
NOTE
pcg is an iterative template routine.
pcg follows the algorithm described on p. 15 in
@quotation Templates for the Solution of Linear Systems: Building Blocks for Iterative Methods, 2nd Edition, R. Barrett, M. Berry, T. F.
Chan, J. Demmel, J. Donato, J. Dongarra, V. Eijkhout, R. Pozo, C. Romine, H. Van der Vorst, SIAM, 1994, ftp.netlib.org/templates/tem-
plates.ps. @end quotation
The present implementation is inspired from IML++ 1.2 iterative method library, http://math.nist.gov/iml++.
IMPLEMENTATION
template <class Matrix, class Vector, class Vector2, class Preconditioner, class Real, class Size>
int pcg(const Matrix &A, Vector &x, const Vector2 &Mb, const Preconditioner &M,
Size &max_iter, Real &tol, odiststream *p_derr = 0, std::string label = "cg")
{
Vector b = M.solve(Mb);
Real norm2_b = dot(Mb,b);
if (norm2_b == Real(0)) norm2_b = 1;
Vector Mr = Mb - A*x;
Real norm2_r = 0;
if (p_derr) (*p_derr) << "[" << label << "] #iteration residue" << std::endl;
Vector p;
for (Size n = 0; n <= max_iter; n++) {
Vector r = M.solve(Mr);
Real prev_norm2_r = norm2_r;
norm2_r = dot(Mr, r);
if (p_derr) (*p_derr) << "[" << label << "] " << n << " " << ::sqrt(norm2_r/norm2_b) << std::endl;
if (norm2_r <= sqr(tol)*norm2_b) {
tol = ::sqrt(norm2_r/norm2_b);
max_iter = n;
return 0;
}
if (n == 0) {
p = r;
} else {
Real beta = norm2_r/prev_norm2_r;
p = r + beta*p;
}
Vector Mq = A*p;
Real alpha = norm2_r/dot(Mq, p);
x += alpha*p;
Mr -= alpha*Mq;
}
tol = ::sqrt(norm2_r/norm2_b);
return 1;
}
rheolef-6.1 rheolef-6.1 pcg(4rheolef)