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CalculiX ccx and ARPACK Error #490

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CalculiX ccx and ARPACK Error#490

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@3rav
3rav
opened on Aug 4, 2026

Error during *FREQUENCY analysis for this academic example
Image

 *ERROR in d[n,s]aupd: info=-9999
       # of converged eigenvalues=6

U^T*M*U=1.000000 for eigen>Exit code: 0

Similar error:
https://mecway.com/forum/discussion/1086/error-in-d-n-s-aupd-info-3

Activity

  1. fghoussen commented on Aug 4, 2026

    @fghoussen
    fghoussen
    on Aug 4, 2026
    Collaborator

    Can you provide some code that can be compiled with arpack-ng that demonstrate the problem?

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