Vandermonde matrix of given degree.
Returns the Vandermonde matrix of degree deg and sample points
x. The Vandermonde matrix is defined by
System Message: WARNING/2 (V[..., i] = x^i,
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Transcript written on math.log.
where 0 <= i <= deg. The leading indices of V index the elements of
x and the last index is the power of x.
If c is a 1-D array of coefficients of length n + 1 and V is the
matrix V = polyvander(x, n), then np.dot(V, c) and
polyval(x, c) are the same up to roundoff. This equivalence is
useful both for least squares fitting and for the evaluation of a large
number of polynomials of the same degree and sample points.
Parameters : | x : array_like
Array of points. The dtype is converted to float64 or complex128
depending on whether any of the elements are complex. If x is
scalar it is converted to a 1-D array.
deg : int
Degree of the resulting matrix.
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Returns : | vander : ndarray.
The Vandermonde matrix. The shape of the returned matrix is
x.shape + (deg + 1,), where the last index is the power of x.
The dtype will be the same as the converted x.
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