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ffddm: use SLEPc in ffddmgeneofullsetup#378

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ffddm: use SLEPc in ffddmgeneofullsetup#378
luspi wants to merge 2 commits into
FreeFem:developfrom
luspi:geneo_slepc

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@luspi luspi commented Feb 17, 2026

This replaces the call to EigenValue() with a call to EPSSolve() which is more robust. It prints out the found eigenvalues and the errors on the lowest rank number where Dk[i] is nonzero.

@phtournier said he needs to think about this one to see if/how to add this.

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