numpy.polynomial.polynomial.polyvander

numpy.polynomial.polynomial.polyvander(x, deg)

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. If V is the returned matrix and x is a 2d array, then the elements of V are V[i,j,k] = x[i,j]**k

Parameters :

x : array_like

Array of points. The values are converted to double or complex doubles. If x is scalar it is converted to a 1D array.

deg : integer

Degree of the resulting matrix.

Returns :

vander : Vandermonde matrix.

The shape of the returned matrix is x.shape + (deg+1,). The last index is the degree.

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