function value = p3 ( x )

%*****************************************************************************80
%
%% p3 evaluates the Legendre polynomial of degree 3.
%
%  Discussion:
%
%    L2 norm(p3,-1,+1) = sqrt(2/7) = 0.534522483824849
%    L1 norm(p3,-1,+1) = 0.65
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    19 July 2019
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    real x, the argument.
%
%  Output:
%
%    real value, the function value.
%
  value = ( 5.0 * x.^3 - 3.0 * x ) / 2.0;

  return
end

