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numpy.polynomial.hermite.hermgrid2d(x, y, c)[source]

Evaluate a 2-D Hermite series on the Cartesian product of x and y.

This function returns the values:

p(a,b) = \sum_{i,j} c_{i,j} * H_i(a) * H_j(b)

where the points (a, b) consist of all pairs formed by taking a from x and b from y. The resulting points form a grid with x in the first dimension and y in the second.

The parameters x and y are converted to arrays only if they are tuples or a lists, otherwise they are treated as a scalars. In either case, either x and y or their elements must support multiplication and addition both with themselves and with the elements of c.

If c has fewer than two dimensions, ones are implicitly appended to its shape to make it 2-D. The shape of the result will be c.shape[2:] + x.shape.

x, yarray_like, compatible objects

The two dimensional series is evaluated at the points in the Cartesian product of x and y. If x or y is a list or tuple, it is first converted to an ndarray, otherwise it is left unchanged and, if it isn’t an ndarray, it is treated as a scalar.


Array of coefficients ordered so that the coefficients for terms of degree i,j are contained in c[i,j]. If c has dimension greater than two the remaining indices enumerate multiple sets of coefficients.

valuesndarray, compatible object

The values of the two dimensional polynomial at points in the Cartesian product of x and y.


New in version 1.7.0.