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check for diagonal matrices in find-diag-in-e-basis #857

Merged
merged 1 commit into from
Sep 30, 2022
Merged

check for diagonal matrices in find-diag-in-e-basis #857

merged 1 commit into from
Sep 30, 2022

Commits on Sep 30, 2022

  1. check for diagonal matrices in find-diag-in-e-basis 

    It seems that LAPACK becomes unstable on ARM when attempting to
find the eigenvectors and eigenvalues of a diagonal matrix. This
instability is triggered in find-diagonalizer-in-e-basis. The
operation becomes trivial when run on a diagonal matrix, so we
check for this and return the identity to avoid making a
potentially unstable LAPACK call.

Fixes quil-lang#842.
    @Spin1Half
    Spin1Half committed Sep 30, 2022
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