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Arunachalam__Easun

Beginner

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11-02-2017
06:08 PM

32 Views

PARDISO - Only trivial solution when solving for nullspace?

I have come across a curious issue when attempting to find the nullspace of a sparse structurally symmetric matrix * A* with PARDISO, i.e. solving the problem

Am I misusing PARDISO or are we intended to set ** b **to some arbitrarily small value rather than zero when we wish to find the nullspace? Is there sample code that where the goal is to compute the nullspace specifically? I didn't encounter such problems when

Thank you.

1 Reply

Alexander_K_Intel2

Employee

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11-04-2017
08:52 AM

32 Views

Hi,

In case of degenerate matrix pardiso find only one solution so it cannot be used for finding set of solution. For your problem it is better to use EE functionality (https://software.intel.com/en-us/mkl-developer-reference-c-extended-eigensolver-routines) - multiply matrix on itself transpose and find zero eigenvectors of resulted matrix

Thanks,

Alex

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