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Topic: iterative solvers
Replies: 3   Last Post: Mar 19, 2012 3:52 PM

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Marios Karaoulis

Posts: 86
Registered: 5/10/10
iterative solvers
Posted: Mar 19, 2012 3:03 PM
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Hi all,
I have a large matrix A (1e5,1e5), square sparse and symmetric, and I
want to fine the solution of
A*X=b;

X=A\b is out of question since I am running out of memory.

None of the pcg, minres or fmres algorithms converge after 250
iterations. They even gave values for x that are negative (everything
should be positive).

The only think it is working for me is this file
http://www.mathworks.com/matlabcentral/fileexchange/22494-conjugate-gradient-method

but it is painful slow. Am I doing something wrong?




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