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# numpy.polynomial.laguerre.lagval3d

polynomial.laguerre.lagval3d(x, y, z, c)

  Evaluate a 3-D Laguerre series at points (x, y, z).

  This function returns the values:

  \[p(x,y,z) = \sum_{i,j,k} c_{i,j,k} * L_i(x) * L_j(y) * L_k(z)\]

  The parameters x, y, and z 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, y, and z or their elements must support multiplication and addition both with themselves and with the elements of c.

  If c has fewer than 3 dimensions, ones are implicitly appended to its shape to make it 3-D. The shape of the result will be c.shape[3:] + x.shape.

  Parameters:
    x, y, z array_like, compatible object

      The three dimensional series is evaluated at the points `(x, y, z)`, where x, y, and z must have the same shape. If any of x, y, or z 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,k is contained in `c[i,j,k]`. If c has dimension greater than 3 the remaining indices enumerate multiple sets of coefficients.

  Returns:
    values ndarray, compatible object

      The values of the multidimensional polynomial on points formed with triples of corresponding values from x, y, and z.

  See also

  `lagval`, `lagval2d`, `laggrid2d`, `laggrid3d`

  Examples

      >>> from numpy.polynomial.laguerre import lagval3d
      >>> c = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
      >>> lagval3d(1, 1, 2, c)
      -1.0