Update 7672, BUG: Make sure we don't divide by zero #7747
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This should fix the issue discussed at https://mail.scipy.org/pipermail/numpy-discussion/2013-July/067076.html Without the ValueError added here, polyfit can (and does) return negative or nan variances with no warning.
Also a slight refactoring of np.polyfit.
This was referenced Jun 15, 2016
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Update #7672. Add test and simplify the check in polyfit.
This should fix the issue discussed at
https://mail.scipy.org/pipermail/numpy-discussion/2013-July/067076.html
Without the ValueError added here, polyfit can (and does) return
negative or nan variances with no warning.