Evaluate a 2D Legendre series on the Cartesian product of x and y.
This function returns the values:
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 2D. The shape of the result will be c.shape[2:] + x.shape + y.shape.
Parameters :  x, y : array_like, compatible objects
c : array_like


Returns :  values : ndarray, compatible object

Notes