Vandermonde matrix of given degree.
Returns the Vandermonde matrix of degree deg and sample points x. This isn’t a true Vandermonde matrix because x can be an arbitrary ndarray and the Hermite polynomials aren’t powers. If V is the returned matrix and x is a 2d array, then the elements of V are V[i,j,k] = P_k(x[i,j]), where P_k is the Hermite polynomial of degree k.
Parameters : | x : array_like
deg : integer
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Returns : | vander : Vandermonde matrix.
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Examples
>>> from numpy.polynomial.hermite import hermvander
>>> x = np.array([-1, 0, 1])
>>> hermvander(x, 3)
array([[ 1., -2., 2., 4.],
[ 1., 0., -2., -0.],
[ 1., 2., 2., -4.]])