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GeezerVison is showing github.com — np.linalg.solve broken on CI · Issue #664 · python-control/python-control

np.linalg.solve broken on CI #664

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#667
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np.linalg.solve broken on CI#664
#667
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@bnavigator
bnavigator
opened on Nov 4, 2021
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Still broken for systems with more states. :(

Originally posted by @bnavigator in #663 (comment)

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  1. bnavigator commented on Nov 4, 2021

    @bnavigator
    bnavigator
    on Nov 4, 2021
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    Current CI runs, specifically the ones without Slycot still fail.

    evalfr() returns nan when the non-slycot branch in StateSpace.horner() tries to solve some matrix equations, which are not singular, but probably not conditioned well enough for the underlying LAPACK library.

    I cannot reproduce locally. It only fails on the conda based Github Actions CI, which uses MKL.

  2. bnavigator commented on Nov 4, 2021

    @bnavigator
    bnavigator
    on Nov 4, 2021
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    Looks like numpy/numpy#20233, conda/conda#11023

  3. bnavigator
    linked a pull request that will close this issueUse conda-forge for numpy and co. #667on Nov 4, 2021
  4. bnavigator
    closed this as completedin #667on Nov 4, 2021
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