CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

tool for approximation of condition number

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   June 22, 2006, 02:03
Default tool for approximation of condition number
  #1
rt
Guest
 
Posts: n/a
Dear

I need a tool for approximation of condition number of large sparse matrix (performance is important because i deal with transient problem), do you knowe such tool? (note that i knowe that MATLAB perform this but it is very slow and memory intensive so it is not practical for large problem, also i knowe numerical algorithm for this but prepared tool, free from bug, is desired)
  Reply With Quote

Old   June 22, 2006, 02:28
Default Re: tool for approximation of condition number
  #2
Ruben
Guest
 
Posts: n/a
See http://www.alglib.net/matrixops/general/rcond.php

  Reply With Quote

Old   June 22, 2006, 08:31
Default Re: tool for approximation of condition number
  #3
rt
Guest
 
Posts: n/a
I deal with large sparse matrix not full matrix, so application of mentioned package is not practical (it is very time consuming O(n^3)+ O(n^2) and also severly memory intensive).

Have other people better suggestion?
  Reply With Quote

Old   June 23, 2006, 06:23
Default Re: tool for approximation of condition number
  #4
Renato.
Guest
 
Posts: n/a
Have you tried Sparsekit?

http://www-users.cs.umn.edu/~saad/so.../sparskit.html

  Reply With Quote

Old   June 23, 2006, 07:22
Default Re: tool for approximation of condition number
  #5
rt
Guest
 
Posts: n/a
Dear Renato

Do you are certain that SPARSEKIT has such tool, i work with it in previous and don't think there is, but if you knowe more please address related subroutine in SPARSEKIT,

with regard.
  Reply With Quote

Old   June 23, 2006, 08:22
Default Re: tool for approximation of condition number
  #6
Renato.
Guest
 
Posts: n/a
Sorry... I misunderstood the packages...

Instead of Sparsekit I should have written LINPACK and/or LAPACK.

regards

Renato.

  Reply With Quote

Old   June 24, 2006, 02:42
Default Re: tool for approximation of condition number
  #7
rt
Guest
 
Posts: n/a
Thanks Renato,

Althouth i don't get my answer but LINPACK is better than previous suggestion (it estimate condition nummber for full and banded matrixes not for general sparse).
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Upgraded from Karmic Koala 9.10 to Lucid Lynx10.04.3 bookie56 OpenFOAM Installation 8 August 13, 2011 04:03
External Radiation Boundary Condition (Two sided wall), Grid Interface CFD XUE FLUENT 0 July 8, 2010 06:49
vorticity boundary condition bearcharge Main CFD Forum 0 May 14, 2010 11:32
Airfoil boundary condition Frank Main CFD Forum 1 April 21, 2008 18:36
Slip boundary condition what is inside normunds OpenFOAM Running, Solving & CFD 2 June 4, 2007 06:45


All times are GMT -4. The time now is 17:11.