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Beginner
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Weird solution from PARDISO

Hello,

I'm trying to solve a symmetric indefinite system with PARDISO but the returned solution is somewhat strange, it's made of only large values (like 3.53e+18). I'm attaching a reproducer, I would really appreciate some insight into this issue.

Thank you in advance.

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Black Belt
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It may be the case that the matrix is nearly singular. Can you check?

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Beginner
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That is right, but it has a really low rank deficiency of 1. For other test cases with similar spectral properties, I have an actual solution, so I was wondering what is happening here.

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