np.linalg.solve broken on CI #664

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1. bnavigator commented on Nov 4, 2021

   

   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

   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