[petsc-users] what does it mean with "-1.#IND" in solution vector?

[Longmin RAN]

Dear all,


I'm using ksp with external superlu package to solve my linear systems. The
system is sparse, real and symmetric, I'm expecting unique solution with
normal values. However, the KSPSolve returned with error 0, but the norm of
error is "1.#QNAN", and in the solution vector some values are "-1.#IND".
What does this mean ? Any help is appreciated. Thanks.


Cheers,

Longmin
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