2012/2/6 Stéfan van der Walt <ste...@sun.ac.za> > Hi all, > > I noticed the following docstring on ``np.polynomial.polyval``: > > In [116]: np.polynomial.polyval? > File: /home/stefan/src/numpy/numpy/lib/utils.py > Definition: np.polynomial.polyval(*args, **kwds) > Docstring: > `polyval` is deprecated! > Please import polyval from numpy.polynomial.polynomial > > > I guess we don't expect users to do "from numpy.polynomial.polynomial > import polyval, Polynomial", so what is the suggested API for getting > hold of the polynomial functions?
You can still import Polynomial from numpy.polynomial. The other functions were removed because 1) They are essentially duplicated for 6 polynomial types, 2) they are mostly there to support Polynomial. You shouldn't need them for most things if you use Polynomial. > Also, why is > numpy.polynomial.polynomial.polyfit different from numpy.polyfit? > > Use Polynomial.fit, it tracks the domain for you. Want to use Legendre functions? Use Legendre.fit. Want to plot the result? plot(*p.linspace()), want to plot the derivative? plot(*p.deriv().linspace()). Want to convert a Legendre series to a Polynomial? p.convert(kind=Polynomial). So on and so forth. The fitting is also NA aware in the development branch. Chuck
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