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# numpy.polynomial.chebyshev.chebval2d

`numpy.polynomial.chebyshev.``chebval2d`(x, y, c)

  Evaluate a 2-D Chebyshev 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 1-D array a one is implicitly appended to its shape to make it 2-D. The shape of the result will be c.shape[2:] + x.shape.

  Parameters : | x, y : array_like, compatible objects The two dimensional series is evaluated at the points (x, y), where x and y must have the same shape. 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. 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