numpy.polynomial.polyutils.RankWarning
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exception numpy.polynomial.polyutils.RankWarning[source]
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Issued by chebfit when the design matrix is rank deficient. 
    © 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.polynomial.polyutils.RankWarning.html