Pre-Conditioners for A to solve A\b.

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Babu
Babu on 28 Jun 2014
Need pre-conditioner's for matrix A to solve x=A\b. Suggest some(with formulas). I am using right pre-conditioner diag(1./sqrt(sum(abs(A).^2))).
But its not working and I am getting bottom rows as zeros.
Please give me any pre-conditioner you know. I will try for my problem.

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