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Re: large sparse matrix


From: David Bateman
Subject: Re: large sparse matrix
Date: Tue, 01 Sep 2009 21:09:04 +0200
User-agent: Mozilla-Thunderbird 2.0.0.19 (X11/20090103)

Carlo de Falco wrote:
2009/9/1 Carlo de Falco <address@hidden>:

Also, what does the code

[R, p, q] = chol(A);
nnz(R)

work for Octave and Matlab?
I tried this in Octave, after 30 min it did not finish yet...
I will only be able to try it on Matlab tomorrow.

If so what is the value of NNZ of the factorization in both cases.

I killed the Octave after it had been running more than one hour and
produced no result.
In Matlab it ran in less than a second and the result was:

[R,p,q]=chol(A);
nnz (R)
ans =
     1368019
issparse (R)
ans =
     1
nnz(R)/prod(size(A))
ans =
     7.035863106552923e-03

Thanks,
c.

Could you sent me the code to generate A,B,E and mat... I might have a better chance of figuring out the issue in that case..

Regards
davis


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David Bateman                                address@hidden
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