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Home/ Questions/Q 7715987
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Editorial Team
Asked: June 1, 20262026-06-01T02:31:29+00:00 2026-06-01T02:31:29+00:00

Does Eigen::EigenSolver work on an object of class SparseMatrix ? In particular, I am

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Does Eigen::EigenSolver work on an object of class SparseMatrix?
In particular, I am using RcppEigen.

Secondly, which algorithm is used? Is it the same QR algo as in EISPACK, LAPACK, Wilkinson (1965) …etc?

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  1. Editorial Team
    Editorial Team
    2026-06-01T02:31:30+00:00Added an answer on June 1, 2026 at 2:31 am
    1. EigenSolver only works with dense matrices, not with sparse matrices.
    2. Yes, EigenSolver uses the QR algorithm. It’s very similar to the one in EISPACK; the documentation says: The implementation is adapted from JAMA (public domain). Their code is based on EISPACK. I believe LAPACK uses a slightly different variant of the QR algorithm with multiple shifts.
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