ar.
    c : array_like
        Array of coefficients ordered so that the coefficient of the term
        of multi-degree i,j is contained in ``c[i,j]``. If `c` has
        dimension greater than 2 the remaining indices enumerate multiple
        sets of coefficients.

    Returns
    -------
    values : ndarray, compatible object
        The values of the two dimensional Chebyshev series at points formed
        from pairs of corresponding values from `x` and `y`.

    See Also
    --------
    chebval, chebgrid2d, chebval3d, chebgrid3d

    Notes
    -----

    .. versionadded:: 1.7.0

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