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Re: [ff3d-users] solve problem with choleski preconditioner


From: Stephane Del Pino
Subject: Re: [ff3d-users] solve problem with choleski preconditioner
Date: Sun, 15 Nov 2009 22:44:24 +0100
User-agent: KMail/1.12.2 (Linux/2.6.31-1-amd64; KDE/4.3.2; x86_64; ; )

Dear Federico,

I have looked to your problem concerning the Incomplete Choleski 
preconditioner. It is very strange. In fact, the matrix size (number of lines) 
is bigger than the number of degrees of freedom. Thus some lines are just 
zeros. And IC fails. When you use the diagonal preconditioner, these 0 values 
on the diagonal is replaced by 1. And then it works.

I am quite involved on other topics than ff3d now and I cannot tell you when 
this will be fixed. I am not able to measure the work it represent to find this 
bug.

I will keep you informed when it is fixed.

Best regards and thank you for the report,
St├ęphane.




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