[petsc-users] "Must select a target sorting criterion if using shift-and-invert"

[Kong, Fande]

Hi All,

I am trying to solve a generalized eigenvalue problem (using SLEPc) with
"-eps_type krylovschur -st_type sinvert". I got an error message: "Must
select a target sorting criterion if using shift-and-invert".

Not sure how to proceed.  I do not quite understand this sentence.

Fande,
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