Evaluate a 2D Legendre series at points (x, y).
This function returns the values:
The parameters x and y are converted to arrays only if they are tuples or a lists, otherwise they are treated as a scalars and they must have the same shape after conversion. 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 is a 1D array a one is implicitly appended to its shape to make it 2D. The shape of the result will be c.shape[2:] + x.shape.
Parameters :  x, y : array_like, compatible objects
c : array_like


Returns :  values : ndarray, compatible object

Notes