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CULA • View topic - Data error in triangular factorization
Page 1 of 1

Data error in triangular factorization

PostPosted: Thu Aug 20, 2009 7:56 am
by jrk1982

Re:Data error in triangular factorization

PostPosted: Thu Aug 20, 2009 8:23 am
by john

Re:Data error in triangular factorization

PostPosted: Thu Aug 20, 2009 8:32 am
by jrk1982

Re:Data error in triangular factorization

PostPosted: Thu Aug 20, 2009 8:57 am
by john

Re:Data error in triangular factorization

PostPosted: Thu Aug 20, 2009 9:01 am
by jrk1982

Re:Data error in triangular factorization

PostPosted: Thu Aug 20, 2009 9:11 am
by jrk1982
Thanks. That worked for the LU factors. However, 1 last issue which I think is genuine.

The permutation vector returned does not seem right... I get [3 3 3] for input, [3 7 9; 6 5 8; 8 5 13]. Matlab returns [3 1 2]...

Re:Data error in triangular factorization

PostPosted: Thu Aug 20, 2009 9:23 am
by john
That's just a notational difference. Matlab's vector is meant to be evaluated in parallel (ie A(p,: )) and LAPACK's is procedural (apply this swap, THEN do this swap, THEN do this one, etc.) In this case they're equivalent.

Re:Data error in triangular factorization

PostPosted: Thu Aug 20, 2009 9:28 am
by jrk1982
Cool. Thanks!

Re:Data error in triangular factorization

PostPosted: Wed Oct 28, 2009 10:06 am
by kolonel
Hi,
I run this code (I removed the memset), but I cannot get the permutation vector as [3 3 3]. TAU vector here returns weird digits as 4.204e-045#DEN, any idea?!
Thanks a lot