[Numpy-discussion] addition, multiplication of a polynomial and np.{float, int}

Denis Laxalde denis.laxalde@mcgill...
Tue Mar 6 15:03:15 CST 2012


Hi,

    >>> np.__version__
    '1.7.0.dev-7c07089'
    >>> p = np.poly1d([1,1])
    >>> p + 1.0
    poly1d([ 1.,  2.])
    >>> p + np.float64(1)
    poly1d([ 1.,  2.])
    >>> np.float64(1.0) + p
    array([ 2.,  2.])
    >>> np.int64(1) + p
    array([2, 2])
    >>> np.int(1) + p
    poly1d([1, 2])
    >>> np.int64(1)*p
    array([1, 1])

What's happening here? I'd expect operations with polynomials would
return a polynomial.

-- 
Denis



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