Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: Lapack spptrf function
Replies: 10   Last Post: Apr 12, 2013 11:08 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Francesco Perrone

Posts: 39
Registered: 5/2/12
Re: Lapack spptrf function
Posted: Apr 10, 2013 1:42 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Dear Mr. Lord,

yes I am aware of the function CHOL and I am already using it.

But CHOL gets tremendously slow when factorizing, e.g., a 1945*1945 matrix.

Within my code I call CHOL, within a 2048 iterations FOR loop, for three different matrices with the above mentioned size.

The elapsed time is about an hour.

For the same case, after downloading the LAPACK wrapper (http://www.mathworks.com/matlabcentral/fileexchange/16777-lapack), the elapsed time was around 17 min less than before: quite a bargain I'd urge.

Btw, after a bunch of tests, MATLAB started crashing at any time I tried calling the function: blatantly, I don't even have a clue why that happened.



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.