numpy.RankWarning
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exception numpy.RankWarning[source]
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Issued by polyfitwhen the Vandermonde matrix is rank deficient.For more information, a way to suppress the warning, and an example of RankWarningbeing issued, seepolyfit.
    © 2008–2016 NumPy Developers
Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.RankWarning.html